Double bass array. Low Q subs. [Quasi]plain wave radiation?

[Flaesh]

Where is your crossover set to the subs

IIRC a little lower 90 Hz. Speakers delayed up to smooth PET.

ringing is the same?

Not completely. Initial decay improved, while tuning is unperfect, while decay before wasn't very bad. IMO\IME improving initial decay is audible in general case, while tails, say below 20 dB, [may] remains in real world.
It is also obvious that the delay is excessive in the old picture.

 

[Flaesh]

Room may be called untreated. A little bit of polyester is lying around.

 

[Flaesh]

I'll quote myself from another thread (so that I don't have to search and\or write again in the future), in response to the question "how to build a [budget] subwoofer with an external amplifier [and processing] and achieve good results":
I hope you already have external processing capabilities, right?
Then you only need a power amp. Any decent power amp with enough power for the drivers and enclosures you're using will do.
The driver(s) can be any decent driver(s) with sufficient displacement in the enclosures used, provided they can handle the power applied. For example, the JBL 2269H is better than a no-name car subwoofer costing $40; but the former is more expensive.
The enclosure, of course , can be any decent one. A sufficiently sturdy box would be better. The criteria for enclosure volume include the room design, the parameters of the driver used, and the permissible power when using equalization.
Take into account the room's transfer function (RTF). In general case RTF for any\every placement of the transducer and listener\mic can be easily estimated by using virtually any driver in a sealed enclosure and comparing the in-room measurement with the anechoic frequency response of that driver in that enclosure.

RTF can vary significantly in different rooms and locations; therefore, in general case the simplest and most reliable method is to measure it. Instead of dreaming about a 12 dB/octave room gain.

 

[Flaesh]

I don't have time to get into serious system setup yet; here are some measurements of unfiltered subwoofers, with the microphone in different positions in the room:

 

[Flaesh]

Someday I'll take measurements with the speakers. But even without measurements, it's clear that the speakers' spl changes differently with distance than the subwoofers' spl. What do you think about this? Would floor-to-ceiling line arrays be useful?

 

[Keith_W]

Someday I'll take measurements with the speakers. But even without measurements, it's clear that the speakers' spl changes differently with distance than the subwoofers' spl. What do you think about this? Would floor-to-ceiling line arrays be useful?

That's what the pro audio guys do, if they have to provide everyone in say, a cinema or an open air concert with the same experience. But you are in a small listening room. I'm not convinced that the SPL of your main speakers would change that dramatically in a small space.

 

[emmodad]

interesting and informative thread, thanks to our (non-fläshy? ) OP and other participants...

 

[Flaesh]

That's what the pro

Nope. A home, floor-to-ceiling, straight array without shading creates a [quasi]cylindrical wave (-3 dB when doubling the distance). Up to its upper limit, determined by the discreteness\size of the elements.
For spherical wave (normal speakers) critical distance

let the gamma be 8, then .057sqrt(8*111/.33)=3 m. I'll have to measure it. And listen carefully.))

 

[DY2]

Someday I'll take measurements with the speakers. But even without measurements, it's clear that the speakers' spl changes differently with distance than the subwoofers' spl. What do you think about this? Would floor-to-ceiling line arrays be useful?

I have the subwoofers placed like this in the room:



And their measured response just a few minutes ago, in the range of 20dB-80dB, with various filters and without:

I tested the front speakers at first, but the bass was localizable, now I actually hear the bass but I don't know where, I ended up getting my hands on the subwoofers to make sure they work.
If it matters, I put the subwoofers through the DBX Venu 360, and calibrated them individually.
Filtered IR looks like this:

THD looks like this:

I know I don't have perfect sound, but I like how it sounds.
I'm posting this information with the idea that I might use something in the future.

 

[Flaesh]

now I actually hear the bass but I don't know where

Is it what you want? D(S)BA bass is heard and felt from the front and physically radiates from front to back.
You may try DBA with your gear.

 

[DY2]

Is it what you want? D(S)BA bass is heard and felt from the front and physically radiates from front to back.
You may try DBA with your gear.

It's what I want from sound at the moment, I also tested your version at the beginning when I had AV7704 in the system, now with AV8805A I switched to 6 independent positions in the room, calibrated with DBX and then through AV, and the result is beyond my expectations.
I also like your approach, but it didn't raise my hair when I tested it in my room.
Now it's a pleasure to listen to Diana Krall on SACD in multichannel format.
The last test measured in the air from the listening position looks like in the picture, and it feels good to the ear.

 

[Flaesh]

non-fläshy?

As Tom Sharpe wrote in "Indecent Exposure": any questions

 

[Flaesh]

I also like your approach, but it didn't raise my hair when I tested it in my room.

Did you save the measurements? What exactly did you not like?
I wouldn't want to hear bass from "don't know where". I just have a stereo system for stereo music.

Now it's a pleasure to listen to Diana Krall on SACD in multichannel format.

Here are a couple of nice, truly enjoyable stereo albums: https://dunerider.bandcamp.com/album/ruins and https://templumanimamorti.bandcamp.com/album/2019-remaster-2022

 

[DY2]

I wouldn't want to hear bass from "don't know where". I just have a stereo system for stereo music.

Many times the translation with google translate is not the correct one.
I am referring to that feeling when you hear the bass but you cannot locate it. I do not know how to put the phenomenon into words, that is why I left the graphics, so at least you can see how the bass hits in my room.
I have the option on AV to listen to stereo, and even to calibrate my system in stereo format and then save the settings on a button on the remote control. But even in stereo mode, still with 6 subwoofers, I like listening to music.
It is just my option and I relate to it. I am aware that others prefer stereo without a subwoofer, or that others prefer another configuration, the important thing in the end is that everyone is satisfied with what they hear...

 

[Flaesh]

the important thing in the end is that

For example, one buddy (PhD of Physics and Mathematics btw) listens to small, expensive wide-band speakers in terrible (acousticaly, as expensive furniture they are not bad) tubes that resonate disgustingly at around 80 hertz, but he’s really happy with it.
In the context of this thread, experienses comparing different ways of using multiple subwoofers are of interest.
I think the term "from don't know where" is acceptable. Although it may not be understood entirely accurately. The frequency response says little about the "perceived direction."

Somewhere around here https://www.diyaudio.com/community/threads/any-controlled-directivity-diys.280249/page-3 Follgott and Geddes are discussing some issues))
ps: starting at #35

 

[DY2]

In the context of this thread, experienses comparing different ways of using multiple subwoofers are of interest.
I think the term "from don't know where" is acceptable. Although it may not be understood entirely accurately. The frequency response says little about the "perceived direction."

Believe me, I have tested almost all the variants in my room for a long time, with the 6 subwoofers I have, I have tested various crossovers, and the final answer is the one where the bass sounds good but I can't locate it as a direction.
Exactly, the frequency response is about this much about the direction where the bass is coming from.
For me it looks like this: