Construction of acoustic box with several woofers

[Moondog55]

PeterMack built a huge woofer panel a while ago I believe using all the spare drivers on his shelf, could have been done on an old door?
I've seen a few "Wall of Sound" speakers over the years and I've thought about doing it myself with all the old junk drivers I've accumulated.
I'm imagining something the size of telephone box or bigger and dozens of drivers tho. Or perhaps using a false wall in a room

 

[GM]

Thanks for the answers!

And GM, I was interested in what you said, about taking the average of the parameters of each woofer, and then using that average to calculate the enclosure, but how would I do that, average all the parameters? Qes, Qts, Qms, Fs, F3, Fts, Mms, Cms, Lp, Sd, Dd, etc...?
And if I want to divide the frequencies between the different woofers that I have, do I also have to average them between all of them, or do I exclude the ones that I am going to use as a tweeter from the calculations, and only include the mid-range and bass ones? Or do I calculate mids and lows also separately?
And then, with that average I took, I calculated the enclosure as if it were a woofer, right? And I do all the calculations and see responses in WinISD as if it were that only woofer?

Thanks in advance,
Greetings!

You're welcome!

Only need Fs, Vas, Qts to calculate the box net volume (Vb). Note that T/S theory peters out at the driver's upper mass corner (Fhm = 2*Fs/Qts), so Fs - Fhm is the box's loading BW.

Hmm, you said these were all woofers, so might can divide them into woofer, mid depending on their frame size, how wide their BW, but none would have enough to do tweeter without having to excessively EQ/boost them unless it's a long enough vertical array to get the necessary acoustic gain.

Right, if wanting to group them into a three way, then average, calculate each group's net Vb.

Right, WinISD will only plot each group individually and if wanting power plots you'll have to include Sd, Re, (Le, Xmax if you can measure them) and use the lowest rated power of all of them to get a 1st approximation as how these will be tied together will determine the summed Re.

As for choosing XO points/slopes, this will be dependent on what each group's usable BW turns out to be, so best to just use DSP.

No clue about summing these plots beyond printing them out and piecing them together by aligning the dB segments.

 

[Radew]

Tenga en cuenta que la teoría T/S se agota en la esquina de masa superior del conductor (Fhm = 2*Fs/Qts), por lo que Fs - Fhm es el BW de carga de la caja.

What do you mean by that? I don't understand

Mmmm, dijiste que todos estos eran woofers, por lo que podrías dividirlos en woofer, mid dependiendo del tamaño de su cuadro y del ancho de su ancho de banda, pero ninguno tendría suficiente para hacer tweeter sin tener que ecualizarlos/aumentarlos excesivamente a menos que sea lo suficientemente largo. arreglo vertical para obtener la ganancia acústica necesaria.

Sorry, it was my mistake, not all of them are woofers, I have 2 tweeters, but the other woofers that do not have a good response in low frequencies, I can use them to reproduce the medium frequencies, and the woofers with better bass, I can use them for lower frequencies , and filter the media a little

Sólo se necesitan Fs, Vas, Qts para calcular el volumen neto de la caja (Vb)

So from what I understood, in order to calculate the volume of a box for different woofers, I have to consider the average of the parameters Fs, Vas, Qts, and I use that box calculated for the woofers, as long as they are for the same frequencies, right?

 

[GM]

The box only loads the driver in its acceleration bandwidth (BW), so once it reaches its mass controlled BW it's 'transparent' to it.

Maybe more easily understood from a horn loading POV along with all the extra math, pg. 7: http://www.xlrtechs.com/dbkeele.com...Preprint) - LF Horn Design Using TS Paras.pdf

Correct, if I understand you. 😉 Again though, if these Fs/Vas/Qts ranges are very wide, then power handling must be limited to the lowest power handling rating at least initially.

 

[Radew]

I understand, thank you very much!

 

[Radew]

I did a lot of research after all the advice they gave me here, but I still have doubts.
I'm not sure if it's appropriate to do so, or if it would work well.
It occurred to me to give you the T/S parameters of the woofers I have to do the project, but I found it to give you some kind of "work" hahaha, but now I'm going to leave you to simply give me an opinion.

Also know that I am not looking for a Hi-Fi audio system, since I know the limitations of the woofers and amplifiers that I have. But what I'm looking for to give you an idea is to be able to achieve deep bass that feels as good as possible, but without distortion, and not losing all the other frequency ranges, always knowing the limitations that the woofers I have give me.

I have a Subwoofer, two 4.5-inch AIWA woofers, another 2 AIWA tweeters, 2 inches. I also have 2 other 1.5-inch Logitech woofers, which were logitech z120s. I also have 2 2.5 inch woofers, these last 2 woofers and the subwoofer were from a thonet-vander system.

All the parameter measurements were made by me with an electrical circuit made by me and with REW.

Any recommendation, comment, etc. is welcome and appreciated.

(The thonet-vander system was the Thonet and Vander Laut Bluetooth)