What frequencies to cut on a subwoofer.

Trifonik and bass. Features of setting. How it should and how it should not be!?

Hello, dear forum users! Let us again speculate a little about the bass and about the features of the trifonik setting. Questions about subwoofers on the forum are constantly surfacing. And very often these are questions about which Saba to choose for music and how to configure it correctly. And if the answers are usually repeated to the first question, the multivarged ALEX does not tire of repeating that it is REL or MJ, then not everything is so clear with the second question. First connection of the subwoofer. Although the recognition of the high.level entrance is considered recognized by the recognition of the high.level entrance, but some continue to look for access to the submarine on their amplifier, and not all amplifiers can be connected by WU! I didn’t even know this. And we often hear this “will miss the bass. Add the submarine “And here the most interesting. Some believe that the Saba should, right, make flooring out of your shelf as. With a blow to the chest and power of large speakers. Others, including Richard Lord, say that the Saba should only complement the AC at the lowest frequencies and not go into the Foreign Ministry of the Bas Foreign Ministry, which your main as. Of course, if you do not have little Sattelites, but I’m not talking about them. From here we have a somewhat different approach to setting Trifonik. Someone puts a high cut frequency and tries to squeeze from the Saba that which is not in its shells, and someone, on the contrary, reduces the frequency and makes the sound deeper, but this becomes noticeably not on all records! And then again we hear the opinion that on records with a small level of the low there you can unscrew the subgurine people who bought good subwoofers and expects the effect from them, and then complaining that they do not hear the subwoofer or it interferes with! It turned out that they had no idea of ​​how to be! What do you think? Maybe there are some more technique or guidelines for those who have or only thinks about Trifonik?

T.There is no FAQ section on the site yet or something like “answers to frequently asked questions”, may the reasoning in the topic may become a starting point for the suffering. Than to write the same answers easier to throw a link 🙂

Answers

Although I am an adversary of the Sabs, I will try to explain why. In my opinion, there should not be a difference of how to connect: at a low or high level. If there is a difference. This is a problem not the type of connection, but a saba design. Further, it should be taken into account that Trifonik is built according to this scheme: satellite should be coasted with a subwoole in at least two parameters. phase behavior and slopes of the frequency response. If the phase is still somehow adjusted, then the inclinations are shared (more precisely to form), without measuring equipment I do not see the opportunity. Well, the submarine should be located as close as possible to the. Therefore, I believe that the correct construction of a trifonik is a very difficult task. But, I think that they really do everything in a completely different way. just add a sub. In this case, the joint work of the AC and Saba takes place, which is not at all “Trifonik”. And here. how many people, so many installation options. But I believe that such a building is not related to high allegiance to sound production. Maybe even better the tone bass regulator add. it will be less evil than an incorrectly configured sub.

Well, and I think that the true purpose of the Saba. Sounding a specially recorded path to him in the cinema.

Thanks for the opinion, Vadim. I agree about the setting. Therefore, he raised this question. And while we see exactly what you are talking about, t.e taste prevails over fidelity.

That’s for sure! I was going to configure the Sub three. of the year. True, after the setup, he did not rejoice for long, the receiver, acoustics and everything were changed by new! And then the sub is covered while I live without it. But in the cinema he definitely lacks: ((

There is healthy food, but there is delicious. Often these are completely different products. The best option is when a little of that, a little of that. “Correctly, non-corrective” in the sphere of sound often does not work t.to. all people are different. And there are also different equipment, ligaments, rooms and record quality. There are settings, ask them in the entire range and choose what you like the most.

In the studios of the monitor system (even a decent size and bandwidth), the sub is joined at 80-85Hz, and do not have joint work. The linear level signal goes to the submarine, where filtration occurs. Sub can also be placed at the distance from the AC, in the place of the room where it sounds as smooth as possible in its frequency response. Then, a thin refinement of the frequency characteristic is performed by Saba and or software. Next, the tone of the signal with a frequency of 80-85Hz is launched, and the phase is switched, installed by the loud sound at the list of listening. After that, it is necessary to align the level of the subwoofer and monitors. You can use a noise meter with the filter C on, at the volume of 75-85DB and the strip up to 1 kHz.

The same thing for multi.channel formats.

And the amendment: if the acoustics are completely large, as a rule, this is a distant field, then in stereo it works without a sub, and in the multi-channel the subwoofer voices only a channel of low-frequency effects mainly due to an increased level of level, the last.

This is why Trifonik gathered at home on the basis of studio monitors and a Saba and is very pleased.

I can’t edit, I will add here. Studio Sabes have a completely defined and fixed frequency of the section for satellites, probably this is not in vain. Also, when placing a subwoofer from the side or in the corner, it is recommended to use 2pcs.

And on the way to the right sound, in my opinion it is worth more often to look closely at studio standards and recommendations than to look for your own and some kind of special sound.

Well, well, at least the branch did not collect a large number of opinions. Apparently the topic of setting up the subwoofer as part of the stereo system is not so popular, although questions about subwoofers regularly come up. The results can be summed up:

Cut frequency and level. Despite the recommendations, set up the subwoofer to maintain the lowest notes that do not play the AC, many deliberately overestimate the cut frequency so that the Saba is well hollowed and replaced by the bass. I do not welcome such an approach, but as it was said by one forum member, that albeit not fan, but tastefully 🙂 From this the conclusion is that a lot depends on the taste, although I have doubtful the quality of the bass received. With this setting, it is necessary to reduce the level on the subwoofer, which means that the lowest frequency will be produced worse. With a decrease in the frequency of the cut, on the contrary, the volume can be added to the level when the docking with AS without a hump on the low.by. And you need to understand that even with a low cut frequency, the subwoofer has an effect on the BAS Foreign Ministry up to 100 Hz is quite noticeable, although the frequency of the cut in the region of 30 Hz. The main thing here is that the sub is added very differently by the bass becomes “heavy” and dominant. Maybe someone likes it, but not for me.

Phase. With apparent simplicity, the phase setting is quite difficult. Some claim that they do not hear the phase coup at all, but believe me, the effect on the sound of phasing has, and not a little. And here sometimes it’s not even enough just to listen to, but you need to use the measuring tool. Having set the phase with AC, at a frequency of 60 Hz, it may turn out that at a frequency of 30 Hz we get an antiphase. Of course, this is rude, but the real weakening of the bass can be. Therefore, then it is strongly overestimated the frequency of the cut, it becomes more difficult to dock the sound of the subwoofer with AS. And the second point is the search for such a place for the subwoofer, where it would be most good with the AC, and here also plays the role of the phase. In general, the phase behavior of different speakers and different subwoofers may differ at different frequency. I came to such conclusions, having conducted quite a few examiners with different subwoofers. Perhaps the contribution is also made by the CDP. So the result will depend on the selection of phasing, namely the sound that you will receive.

Place of installation. As already mentioned, it is better to choose the installation site based on the best conjugation with the AC, and this is essentially again the selection of phasing. Otherwise the bass will cease to be clear and instead of quality we get the number. If it’s difficult with the place, many live in typical apartments, then it is good when there is a smooth phase adjustment on the sub. Well, and about strengthening the return on the bass in the corner, you should remember, and about the fact that you should not put a subwoofer in the center of the room. Although, it is best to approach creatively in each case.

Type of connection. As you know, there are two types of subwoofer connection to an amplifier at a high level (WU) to AC terminals or low level (well) to a special exit to the submarine or to the exit from the preliminary. What is the best way to divide. My experience is for WU, but maybe there are cases where it manifests itself better. I think it depends on the model of a particular subwoofer and on the amplifier model.

Port Output Resistance

The most easy way to lower the setting is to “load” the port so to speak, that is, give air resistance at the port output. This can be done elementarily by moving or turning the port closer to the wall.

If your port is directed to the side, then the case can be pulled to the wall, if the port of the port is on the front wall, then it can be pulled to the backs of the rear seats or to the trunk lid.

Using this method, you can decently lower the body setting, but there are your nuances here.

If you squeeze the port too much, then it is logical that the effectiveness will fall strongly or Phi can generally turn into zy. Therefore, everything is necessary here in moderation and more often this is used in cases where the port is big for the “subwoofer-comb” system or this location has already been taken into account when calculating.

Digging dynamics

If you turn the speaker upside down, it will add a useful volume. Since now the basket will not displace its part. This usually allows you to bring down 1-1.5 hertz in the average box.

There is also separate material about this effect where all aspects of the installation of the subwoofer is disassembled by the magnet out. installing the subwoofer upward upwards.

Gain \ Level

Gain (sensitivity) is often confused with volume, but this is not entirely correct.

Gain (Gain) is an adjustment of the input sensitivity of the amplifier for coordination with the radio. But we will not climb into the jungle and consider this setting in terms of user useful for the user.

Sometimes the value of volt (V) indicated on the regulator can mislead. The fact is that sensitivity is measured in volts. The smaller V. the higher the sensitivity. the louder the speaker will play and vice versa.

To begin with, it will be useful to watch a witnessed video about how Gaine works on an amplifier:

Gain setting by ear (1 method)

Having a good sabovary link, do not use the equalizer and various bass improvements, forget about the Bassboost on the amplifier. therefore, before setting up the game, check for all this to be disconnected!

Install the regulator for a minimum and turn on the music you usually listen. Add the volume of the radio 3/4 from the maximum, hearing distortions in the sound of a sub earlier. stop and reduce the volume for a couple of divisions. Go to the amplifier. Ask the assistant to slowly add a game regulator until new distortion appears, and when you hear them, stop the rotation and reduce 10 %.

Gain settings by ear (2 method)

If you do not trust your rumor and are afraid to not hear changes while, then use in a more accurate way. with the help of sinuses.

If you set up a subwoofer, then use 40 Hz, if your case is configured above 40 Hz or you have a closed box, then take 50 Hz, (download the sinuses in the download section). To configure the game for the midbass amplifier, take 315 Hz.

Sinus or tone (in our case). a tone signal of a certain frequency, changes in the sound of which you can easily hear

Set the Gane to a minimum, turn on your sinus and add the volume of the radio. When changing the sound of a tone signal, stop and reduce the pair of divisions (set the maximum volume limit to this value if your radio has such a function). Go to the amplifier. Similarly, the first method add geine. When changing the sound, stop and reduce by 10%.

Gane setting up using a multimeter or oscilloscope

Gain level setting using devices is a competent and accurate coordination. In this case, neither the speaker nor your ears are strained. Details about such setting is shown in the video on our YouTube channel:

Please note that when setting up using a multimeter, you must be sure of the power declared by the manufacturer of the amplifier.

Subsonic

Subsonic. this is the same high.frequency filter (HPF) on saboic amplifiers (often on monoblocks). cuts off infrasound. Install it by default by about 20-25 hz. With in.depth tuning, Sabsonik is set to prevent excessive diffuser stroke. Sinuses are alternately included below the frequency of setting up the subwoofer case and the desired value is selected by observing the size of the diffuser.

Bassboost-increases the volume at a certain frequency, as a rule it is 40-45 Hz. When using Basbust, the chance to burn the subwoofer rises sharply, since the clippus occurs much earlier. In most cases, Bassboost is not needed and if you are a newcomer, then just accept the rule “Basbust, do not touch!””

Experienced people can be used to increase the frequency response shelf to pull the failures at certain frequencies, but this is already deep settings and the effect will not always justify the risk.

How to adjust the subwoofer, article. Portal “www.Hifinews.ru

Buying a large subwoofer does not yet guarantee to get a magnificent bass from your audio system. This leadership tells everything you need to know to obtain maximum acoustic return.

Buying a large subwoofer does not yet guarantee to get a magnificent bass from your audio system. This leadership tells everything you need to know to obtain maximum acoustic return.

Subwoofer Settings: Accommodation and Positioning

Although the low.frequency component emitted by the subwoofer is non.focused, you should not install the subwoofer in any room most convenient in your opinion, since there is the possibility of partial loss of sound quality for which you paid.

Searching in your room for a suitable place for a subwoofer can identify sharp differences in the sound. Corner accommodation for most people is actually the standard, it is possible, because in this case it is almost always possible to get the deepest bass. But the angular placement cannot give the most accurate bass (and / or smooth conjugation with the rest of the columns).

Subwifers with small speakers (8-inchs or less) are better installed at a distance of about a meter in front of the front left or right column. With excessive shift, it is much more difficult to maintain the illusion that the bass comes from the speakers, and not directly from the subwoofer. This remark is doubly true for small home theaters with a subwoofer in the kit, place it as close to front columns as possible. Yes, and when you are looking for the right place for a sub, do not forget to add the volume level, so as to clearly hear that from there it sounds from below.

Some tips for determining the place for the subwoofer may be useful. When reproducing a CD with a large number of deep bass, moving the subwoofer, track all acceptable places for listening. You will be struck by how much the sound changes depending on the location of the sub. In some cases, the bass will be dirty, sometimes they will sound louder, and sometimes quieter. The purpose of the experiment is to get the optimal balance between the deep bass, the upper part of the low.frequency range reproduced by the subwoofer and the average frequencies of other columns. In some rooms, this condition is difficult to achieve. According to my observations, there are “problematic” rooms where the bass always sounds loud or unclear.

In such cases, try the next method. Move your sofa or chair to another place, or try to listen to the subwoofer in another room. Then turn on the music or a movie with a large number of bass and also, moving the subwoofer, select the most successful place for listening. When moving, you will note that the volume and clarity of the bass change from place to place.

If nothing helps, try installing the sub. This location may be very successful.

Large columns, as a rule, are easier to agree with the subwoofer. It is more difficult to small and / or, if in the speaker system a small subwoofer. In this case, to achieve the necessary effect, a more thorough setting may be required.

Subwoofer Settings: connection and accurate setting

The rear panel of the HSU Research subwoofer shown in the photo is considered a rather typical. Although for beginners in acoustics many connectors can be frightening. But in most cases, there is only one, connected to the input “Sub in”, the cable provides effective sound. On other subwoofers, this entrance can be marked as “LFE”, “Direct” or “BYPASS”.

To connect to the Sub / LFE entrance, you will need a long connecting cable, which can be purchased in household electronics stores. How long should the cable be? Measure the distance between the a / v receiver and the subwoofer and do not forget to take into account, if necessary, an additional distance for enveloping the doorway cable or other obstacles. If, after opening the package, the cable is shorter than necessary, you will not be able to return it back to the seller.

Then turn the handle of the frequency characteristic regulator (crossover) to the maximum value. We will rely only on the system of frequency division of the sound signal built into the A / V receiver. It should direct medium and high frequencies for reproduction by channel columns, and the subwoofer will have to get only low frequencies (bass).

In the receiver menu you will find regulators for setting up a crossover, which determine the strip of frequency columns reproduced by speakers. Some receivers have an extended frequency range for setting up the subwoofer: from the lower frequency of 40 Herz to the upper 200 Hz. Specific recommendations can be obtained from the leadership for your subwoofer or column. Otherwise, the following recommendations can be used to configure the crossover. For small speakers with 2 or 3-inch, the speakers, try values ​​from 150 Hz to 200 Hz, for medium-sized speakers (4 or 5 inches), the low frequency is lowered to 80 or 100 Hz, and for large speakers of floor or shelf columns Try 60 or 80 Hz.

If you have happened to become the owner of large floor columns with 8-inch or more than a dynamic, you can note them on the menu as “large” speakers, without a crossover at all. But the central, front and rear columns will probably still sound better in the “small” columns mode using the sneakers settings mentioned in the previous paragraph.

Another sound regulator of the subwoofer is marked as “phase”. It is necessary because the speakers of the columns and the subwoofer sound better when they work “in the phase”, that is, the diffusers of the speakers move forward and backwards synchronously. To check the loyalty to the phase installation, listen to music with a lot of bass for about a minute, then ask the friend sitting near the Saba to change the position of the phase regulator. It is necessary to slowly translate the regulator handle to a position of 180 degrees, then back and, again forward. “Correct” setting up in which you will hear more bass. Maybe you have to listen to a few records before you note the difference, and at the same time, perhaps, it is worth slightly increasing the volume level. If you do not notice any difference between the provisions “0” and “180” at the phase regulator, leave it to position “0”.

At the intersection of two frequencies. The main principle of the car subwoofer. Magazine “Avtozvuk

The last time we came close to the behavior of the dynamics according to the parameters of the til. Smolla a few months ago, it’s just right to “remember everything” at the second visit, but we will not. Let’s remember only one key phrase.

Close to the text from “A3” /2005: “For the midbasses doomed to work in free conditions, the parameters of the head and will be final, and for the subwoofer we use the head parameters for the calculation, according to which we make design that is considered optimal”.

This means that we have gently and without a pump switched to operations with a subwoofer link in a car audio system, which you can not do without. Either you can’t do, or I do not want to do it, or both. But before going to business, we will still ask the question for the order: “And, in fact, why?””

The question is partly sacrificial, but still recall: the most avid audiophiles (and those who joined them are just lovers of listening to music) easily bypasses at home with columns with low.frequency dynamics of caliber (using our terminology) in the same 6. 7 inches that we have at the front, and feel great. The main reasons, by and large, are two, the work is not great to recall them again.

First: the doors of the car are not at all equivalent to the mighty buildings of home columns, which is not done with them, and at the lowest frequencies the sound pressure drops. The Diffuser of the Midbas (if its frequency strip is not forced by anything) is desperately shaking, trying to depict the bass, but they die in leaks and the insignificance of the thin steel shell, and only distortions are the audible result. They, as it should be harmonics, is higher in frequency, therefore they are reproduced perfectly.

Second: in the car they listen to music at higher volume levels, especially. at low frequencies. This is due to the incomparably higher level of external noise, and just a tradition that can outweigh any physical patterns. How much motorists love the bass? General We know the answer: they love it very much. Or rather, in decibels?

In October 2004, we first began to measure the frequency response on sound pressure in the passenger compartment of cars that fell into the heading of the “system”. The measurement data has been accumulated and continue to accumulate in the form of files in the format of the PHONIC PAA2 analyzer, which has, among other things, and the possibility of equipping the filmed characteristics. And now we decided to see what the frequency response will look like, which is a synthesis of the activities of professional installers in a year and a half. The voice of the people. The voice of God, in the course of overthrow, numerous individual characteristics and/or flaws should be smooth as statistical noises, and general trends. manifest. So here: for the first time, the frequency response is published, obtained on the basis of approximately 80 frequency characteristics removed in a year and a half.

Curious was a picture, an occasion to think about morals reigning in society. But now we will focus on the low.frequency area. General trend: people want to have sound pressure at low frequencies significantly higher than on medium. If they did not want, they would not have done such frequency. Using other PAA2 functions, we even disclosed the deviation of the frequency response at low frequencies from the horizontal line. At a frequency of 40 Hz, the rise of the “folk” frequency response was more than 14 dB. What does this mean? Suppose you have such magical midbasses that they are able to provide even frequency response up to 40 Hz. And they are now summed up the power of just something, say, 5 watts. To arrange such an ascent on the bass, the power supplied to the speakers should be approximately 25 times more. Not 5 watts, but 120. 130. Really? No, of course, in normal 6-inch speakers, the power permissible according to the thermal regime is lower, and long before the distortion will exceed all conceivable limits. That is why this part of the frequency spectra in the car is recouped by a specialized speaker, for which a hundred watt is not a disaster, but a normal operating mode.

By the way, we could not resist and performed the same operation, leaving only cars in the sample that took high places in auto.sound competitions. As expected, the “medium.marty” frequency response looks much more modest “nationwide”.

Familiar with past issues “in.AT.”Should have noticed in the given logic signs of some slyness. Indeed, after all, there is a transmission function of the salon, thanks to which it is in the car (that is, where the masses require this), the frequency response starts from some frequency by itself, without any intervention from a person. It’s good that they really noticed the transmission function of the salon. True God’s grace for auto shutters, do not be it. It would be incredibly difficult to get the desired characteristic even with the help of a subwoofer, and at high volume levels (let’s not forget about this taste). And it is completely impossible. However, the fact of the presence and uninterrupted operation of the gear function does not eliminate the need for a separate bass link, but simply makes certain requirements for its design and calculation. Or you need to remind you of the gear function? Now is the time, further without it. no way.

We decided to remember everything, so let’s and we will be everything. So, predicted, noticed, is explained theoretically and strictly confirmed by practice: if a speaker has a flat horizontal frequency response in the car’s cabin, then when the signal frequency is reduced, starting with some value, the sound pressure in the cabin will increase, despite the fact that the power supplied to the dynamics remains unchanged. The frequency with which this happens is determined by the size of the salon.

Here some people get confusion: the compression effect, it is also the effect of the transmitting function, it happens, it is confused with resonances that occur in the cabin. For clarity, let’s make a mental experience. Let an acoustics be installed in the car’s cabin, on which we give a sliding tone signal. Starting from above. While the signal frequency is high, the sound waves are short, they have fun, at the speed of sound, run along the cabin, reflecting and absorbing on its borders. Когда длина волны, возрастая со снижением частоты, начнёт быть сравнима с наименьшим(!) the size of the salon, this is usually its height, there will be a standing wave, and depending on where the listener is located, it can get to the minimum point or, conversely, the maximum of the intensity of sound vibrations. It is fundamentally that there are several such frequencies (unless the salon has the shape of a ball with the listener strictly in the center), and perceived by the listener (or a microphone, if measurements go), the effect significantly depends on their coordinates in the cabin.

Member

Sergecodeq in electronic manufacturers have already thought for us, unless this is an exotic homemade device. If everyone begins the heads of iron, they will not buy this piece of iron. There were no crime in the synthesizers known to me. Stick and write. The main thing is to sound good

Member

I can be. I won’t argue as I don’t know. Well, why all the same they advise cutting frequencies, say from 40 Hz? (or up to 40, as it will be right there?)

Romik

New Mamber

Well, why all the same they advise cutting frequencies, say from 40 Hz? (or up to 40, as it will be right there?)

In my opinion, so that there is no porridge. This does not mean that on the master you need to put HPF on `40-50`Hz. Just with bass, you need carefully so the Juno reactor has a song Ice Cube. here bass so bass. Hertz on `20-30` definitely cuts a boot. It makes sense to cut it more likely to `20-30`Hz exclusively with the purpose of cutting out the DC component (frequency of 0Hz) or cut to remove excessive Rumble. The same porridge I talked about. But this is rather a consequence of incorrect information and it is only necessary if there is only a resulting master.

Connection and configuration

Connecting a subwoofer through a high.level entrance

I use an integral amplifier in which there is no special exit for the subwoofer. So in my case, the connection will be implemented through the high.level entrance of the subwoofer. For this, a copper cable with a section of 4 kV was found in the bins.mm.

I connected one of its ends to the amplifier, taking “-” from the left channel and “” from the right. On the subwoofer, the connection made in a similar way: on the upper pair, the terminal used the black terminal of the left canal and the red terminal of the right.

The power cable is connected to the network, the power tableter is installed in the “Auto” position. At the end of these simple manipulations, the Sabe turned on and began to play when he received a signal from the integrane.

Search for a place for a subwoofer

The place for installing the subwoofer was determined intuitively even before the Sab was with me. No matter how strange it may sound, but my choice fully met expectations. Now I will explain what is the matter.

Apparently, due to the specifics of my listening room, after a certain volume level, the imaginary scene began to shift to the left of the central point. The most terrible thoughts came to mind. for example, a driver’s malfunction on the left column. But such thoughts were dispelled quickly and easily: changing the shells in places, I heard the same effect. the scene “leaves”. When casting an amplifier channels, the effect was also preserved.

Apparently an empty corner in the upper left corner of the room (see. scheme below) after a certain volume level, he made his adjustments into the sound. The plan was this: to resolve this resonance in the left corner by placing the subwoofer closer to the right speaker. And the plan worked! After a few minutes of exercises with a 20-kg box, the optimal place was determined.

The subwoofer stands to the right of the center of the room, along the line. Its speaker is directed to the sofa. Option when the sub is even closer to the right speaker, I didn’t like it. Still, despite the existing opinion that low-frequency radiation to certain frequencies is not localized in space, my hearing of the Sub is defined as source of sound.

And the overall sound picture looks more harmonious when the subwoofer is located closer to the center, along the line. Thus, I, as they say, “killed two birds with one stone”, satisfying both my Wishlist with this arrangement of Saba.

The next stage is the phase adjustment. Before starting to solve this problem, I turned the sabwuofer volume control to its maximum position so that the bass was heard “in all its glory”. In position “180” low frequencies filled the room completely, forcing some furniture to tremble with delight.

In position “0”, the degradation of the low.by was heard by the naked ear. Sub, due to much greater returns in low frequencies in comparison with shells, was not only able to suppress their bass, but also to break out of their captivity. The result of such a setting is sad. sound, as if “from a barrel”. In addition, medium and high frequencies come to the forefront. In general, it is quite simple to determine this setting, without even having any experience.

In addition, for the purpose of the experiment, different phase provisions were tested within “0–180”. Such an experiment did not bring useful results: as the regulator moves towards the position “0”, the bass weakened, as he gradually shifted into antiphase with acoustics.

Thus, the next setup of the subwoofer was successful.

It is time to decide on an equally important parameter. the installation of the cut frequency on the saba crossover.

The manufacturer claims that my shells play from 47 Hz to 54 kHz with an unevenness of ± 6 dB. Phazoinverter is set by 55 Hz. According to the results of adventures with a tone generator, information about the low.frequency range is quite reliable, and it can be used in further settings of the subwoofer.

But it is worth considering one more point: the resonance of the room, on my ear, coincides with the configuration. About 55 Hz in the room for listening is felt a rather unpleasant rumble. The situation smoothes the situation that this resonance makes itself felt only on a fairly high volume, which is higher than that I use for long.term listening.

Thus, the first of the settings of the crossover, which came to my mind, is the extreme left position of the regulator. 40 Hz. Several short auditions at half the volume of the Saba. and I liked the result. Further, smoothly twisting the crossover clockwise, I conducted the same short auditions. But ultimately returned to the initial setting.

With the shift of the cut of the crossover in the direction of increasing the frequency, a clear excess of the bass was felt in the range where the phase.inverter of acoustic systems is working. The filter in the extreme right position, in my ear, gives flanes to the general picture of low frequencies. So, based on the above, it was decided to leave the filter setting for 40 Hz.

Saber volume adjustment relative to stereo

I read somewhere that it is customary to coordinate the subwoofer and acoustics in the sound recording studios using the tone generator in terms of frequency either 80 or 85 Hz. Why not try?

Launching at the tone generator at first 80, then 85 Hz, with the help of improvised tools, I tracked the peak values ​​on the shells, and then on the subwoofer. The peak value of the Saba turned out to be lower, so the volume handle had to be spilled from 12 hours for about two.

Fly listening gave a negative result: on my hearing, the bass turned out to be too accentuated. Thin refinement in the opposite direction was found the optimal position of the regulator for me-a little more than half.

The submarine is connected by high level to the amplifier terminals;

placement. to the right of the center, along the axis of the AC;

The cut of the crossover is the minimum possible. 40 Hz;

volume control in position a little more than 12 hours.

Listening and impressions

Finally, quick auditions were left behind, and you can slowly, comfortably and with arrangement evaluate the settings.

Remember how it happened in childhood? If you want some toy, you dream, you have a money sooner or later you buy it. Joy! But then it turns out that this toy is even cooler than you imagined. Delight!

This is exactly the feeling that I experienced. The sound picture has become complete, saturated, deep and voluminous. My fears about the fact that the localization of the Saba will spoil the imaginary scene at the same moment. Everything happened accurately the opposite: the outlines of the tools became even more tangible than before. Magic, not otherwise!

In compositions with the vocal part, another surprise awaited me: the vocalists’ voices received a good, significant support. Even in the case of female vocals, changes are obvious: against the background of a massive and accurate development of low frequencies, female vocals are perceived in a completely different way.

It is difficult to describe all the impressions of changes in the sound, since in each composition the nuances are released, which were previously inaccessible. This is the case when you want to listen to the whole background again. What am I, in fact, I will do.

In the evening, when pleasant fatigue began to feel, I decided to turn off the subwoofer and listen to how it was before him. I will not describe impressions for a long time. I will only say that I was not enough for long. The sound that I strove to start after turning on the subwoofer.

A few words about the neighbors: on a volume comfortable for me, the Saba diffuser does not even reach the amplitude of the fluctuations inherent in him. At the same time, his contribution to the general sound of the system makes most of those floor speakers that I heard. But in no case do not neighbors.

Sabwofer with a phase inverter. calculation, configuration and typical errors

Theory and practice “on the fingers”. Craftsmen whose hands grow out of the shoulders, and in their heads. sawdust.

What is a phase.inverter (f) in a column or subwoofer? This is a pneumatic acoustic resonator of the Helmholtz. And as any resonator, he has a resonance, very pronounced, with high quality and steep slopes, such a pipe, sings on one note (see. DJerida). So, in the corps of the Saba we have two resonators: active (speaker) and passive (phase.inverter). Both of them affect each other through an elastic environment (air).

Purpose of FI: Reducing the lower operating frequency of the subwoofer. A slight decrease. So let’s see if it is worth.

Most opinion: the subwoofer from the fu plays a bottom thoroughly louder than a zy due to a higher efficiency. Oh well. And if he played four times louder? Or at six? Happiness is like!

The assertion that the sub.interpers are reproduced by low frequencies much louder than saba.ss. this is the glorification of idiocy of an illiterate developer. And partly illiteracy. Yes, indeed, Saba from Phi can play the bottom louder than Zy, but it should not be like that! This is a distortion of the tonal balance of muses. works at frequencies close to resonance fi. To make it clear to you, this is a loaf of a saba on one note. But with high efficiency, which for some, presumably, is especially pleasant.

In the subwarf saba, it should not be louder, but lower than in zy.

Yes, exactly like that: the advantage of the right fu above the zia is not as great as it is advertised. Therefore, they make hunchbacked tambourines cheaper and simpler, so that “sausage”. (Boombox. Bukhalo)

A typical representative of the subwoofers with FIs, tumbling on the same note with a high efficiency. Suitable for tape and toys, completely not suitable for the muzon. For music, the adjustment of low frequencies should start with 500-600 Hz and smoothly increase to 20-40-kes Hertsa.

Two resonances should be equalized by sound volume: f and dynamics. A skew of excessive volume of the fu above the rest of the bottom is eliminated by a completely blasphemous method: it is necessary to reduce the return of the phase inverter with your handles, to fill up an excessive efficiency. E-tes-but, hearing the bottom will be reduced, but they will be even, and 35-40 % lower than in. As actually should play a well-debugged fi-sab.

It is not difficult to set the resonance: it is necessary to reduce the quality of the fu by creating a small acoustic resistance, placing fibrous material in the resonator pipe. Which and how much is selected by experimentally, it is better with the generator and you can by ear. To reduce the quality of the resonator (and not at all from cockroaches), some companies put a small, elastic, elastic nylon mesh, something like tights in the pipe, but in our case you can simply push not the most smelly sock or shmat of synthetic winterizer. It turns out something intermediate between pure fi and pure zya, and this something can be adjusted, selected. The operation will take a minimum of time: not to break. not build. 🙂

(GVZ, though there will be a little more, but what to do if the whole structure is vicious, even if he does not cut the hearing. But the steepness of the frequency response will decrease a little)

Note. By the way, passive radiators (diffusers) in the subs do this: they lower the quality of resonance, smooth it out. Due to its mass and inertia. Therefore, subwoofers with passive radiators are not prone to tumble, but they have “sluggish” bass and a large GVZ.

Typical Chinese sub. Really removed characteristic:

Excessively spaced resonances of fi and dynamics. Dynamics resonance. 58 Hz, phase intelligence. 27 Hz. Everything is explainable: at lower frequencies, the back of the speaker emits weaker, and the resonator rocks weaker. The larger the frequency variety, the lower the peak of the resonance fu in relation to the total frequency response (the one that is higher than the Dean resonance).

I draw your attention: the frequency response of the fi (resonance fi), as it were, slides up and down along the flowing inclined frequency response, like a slide. This is the essence of the selection of the frequency of the resonance fu in any subwoofer. Когда вы будете изменять длину трубы ФИ (или её диаметр) именно так и будет меняться АЧХ вашего сабвуфера. What frequency of resonance fi will choose and play.

Example. The Chinese (and not only them) sometimes put a cheap speaker with a high resonant frequency in the Saba (I met fs = 65 Hz). When installing in the case, its resonance increases to 85 Hz. E-tech, the bass will not give such a sub. And then they put fi in the sub, a frequency, say, 30-35 Hz. Advertising what: 30 hertz!

What turns out? Below the resonance frequency, the speaker works as in a closed box, that is, below 80 Hz, its sound pressure drops smoothly at a speed of 12 dB/octave, which means it will play 4 times quieter on 40 hers than 80. What does a normal person do? That’s right, adds the volume of the saba.

And here the tricks begin. I’ll tell you how it looks like.

Includes a man Muson, an orchestra, for example, the bottoms are clear a little stump, and he adds them to the level he needed. Everything, the orchestra sounded, the person enjoys. And suddenly, at some unpredictable moment, one of the notes falls into the resonance of the phase inverter. In kind, it looks like this: against the background of even music, suddenly puts his ears, begins to tremble the floor and liver: the pipe is sang dud. At the same time, the sound is practically not heard, only the trousers clap and the dishes are rattling. After 1-2 seconds, the note ends, trembling disappears, and the orchestra continues to play, as if nothing had happened. Until the next such note. You don’t listen to music, but you sit and wait for it when it smells again.