In-floor subwoofers - 8x8" drivers each, highest WAF factor - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 24 Old 02-06-2019, 02:10 PM - Thread Starter
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In-floor subwoofers - 8x8" drivers each, highest WAF factor

I built in-floor sealed subwoofers consisting of 8 x 8" drivers each (Dayton Audio DCS 205-4). Those were the only 8" drivers which I found to fit in the subfloor cavity with a box built around them. Each sub has the cone surface area of 2 x 15" subs and 1 x 15" sub displacement. The drivers were not the reference type but I had to compromise since they were the only ones which would fit. The whole build was designed around the subfloor cavity restriction.
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post #2 of 24 Old 02-06-2019, 02:11 PM - Thread Starter
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The purpose of the subs was to use them below 40Hz. The box size gives each driver Qtc=0.9, Vb=5 Ltr, , Fb=82Hz .
When the house was still renovated and did not have the drywall installed yet I tested them both with 120Hz x-over at full displacement and they played really loud - I would say around 120dB at 120Hz. The garage floor concrete slab was shaking .
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post #3 of 24 Old 02-06-2019, 02:13 PM - Thread Starter
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Each subwoofer has 2 boxes - the first one is the "drivers head", the second box is the "cavity box". Assembled total length is 10.5ft, height 9.25", width 14".
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post #4 of 24 Old 02-06-2019, 02:13 PM - Thread Starter
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The subwoofer boxes are bolted together and have a removable cover for bolts access. They were installed in the basement ceiling - between the floor joists. The boxes are separated from the floor structure and don't transfer vibrations to the house. The drivers are mounted opposed to each other to cancel any vibrations too. The boxes are suspended by multiple metal straps (like a swing cradle). For safety there are aircraft cables spun across the bottom too (not tensioned, slightly loose and taped to the boxes to prevent rattling).
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post #5 of 24 Old 02-06-2019, 02:14 PM - Thread Starter
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The subwoofer ports are covered with the same covers used for the heating ducts in the house and you can't tell that they are there.
When there was no furniture in the house yet you could feel the floor bending from the air pressure whenever the subs played.
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post #6 of 24 Old 02-06-2019, 02:22 PM - Thread Starter
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Now when I have them set up below 40Hz they are enough for movie playing. For this open floor plan and the music levels I enjoy occasionally though I would need 4x that displacement. That's why there is another project on the go for few years already - but that's another topic altogether https://www.avsforum.com/forum/image..._face_wink.png .
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post #7 of 24 Old 02-06-2019, 02:25 PM - Thread Starter
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.. more pics ...
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post #8 of 24 Old 02-06-2019, 02:27 PM - Thread Starter
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... some more pics ...
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post #9 of 24 Old 02-06-2019, 02:53 PM
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Would love to be a fly on the wall when these are going. That build is dedication for you. Somebody's gonna say put some 18's in there.
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post #10 of 24 Old 02-06-2019, 03:22 PM - Thread Starter
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There is a new project going on for the last 3 years: Open Baffle Line Array (L/R) in the same living room.
Speakers: Dayton Audio RSS265HO-4 (x32; infrasubs, L/R Line Array), Dayton Audio RSS265HF-8 (x32; woofer subs, L/R Line Array), Dayton Audio RS100T-8 (x48; mids, L/R Line Array); Dayton Audio AMT PRO-4 (x20; tweeters, L/R Line Array); Dayton Audio DCS205-4 (x16; in-floor subs); PSB CW383 (x4; surrounds);
Amplifiers: Behringer NU4-6000 (x6) - infrasubs and subs amps; Crown XLS 1500 (x4); Crown XLS 2500; Crown XTi4002;
Total power: 36kW
I just have to find the time to put them together.
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post #11 of 24 Old 08-24-2019, 06:49 PM - Thread Starter
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Infrasubs will be sealed boxes, xover 45Hz - 2 Line arrays
Subs will be OB, xover 45-250Hz - 2 Line arrays
Mids will be OB, xover 250-1.6kHz
Tweeters will be OB, xover 1.6kHz
Mids and Tweeters - 2 Line Arrays

Line Arrays height - 86in


All that stuff is still piled up in the basement for the last 3 years.
Recently I had to rotate the boxes since the bottom ones started collapsing.
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post #12 of 24 Old 08-24-2019, 07:17 PM
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Awesome work, That is defiantly one way around that WAF thing.
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post #13 of 24 Old 08-24-2019, 07:30 PM - Thread Starter
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Originally Posted by Remy.Alexander View Post
Awesome work, That is defiantly one way around that WAF thing.
Thanks!

One can never be too WAF
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post #14 of 24 Old 08-24-2019, 11:53 PM
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Amazing solution. Does all the sound come through those two vents? Do hear any chuffing at high SPL?
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post #15 of 24 Old 08-25-2019, 07:13 AM
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Simply unbelievable. Does OB mean open baffle?

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Bedroom: Simple 5.1 setup using MLT-2 LCR & Surrounds, some hidden DIY shallow 12's, a couple BST Bass Shakers, most importantly a PB875 Enso Power Base.
DIY Living Room: One 800 lb. VBSS credenza, 3 horizontal Elusive 1099s, a couple non-traditional HT-8 as wedges for height duty, and some DIY Volt 6 Surrounds.
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post #16 of 24 Old 08-25-2019, 04:08 PM - Thread Starter
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Originally Posted by bochoss View Post
Amazing solution. Does all the sound come through those two vents? Do hear any chuffing at high SPL?
Yes, those are the subwoofers vents. The opening is 4inx12in when cover removed. There is some chuffing at high SPL although for casual listening in the living room (at -15 db) they are still fine.
The in-floor subs are my "Plan C" - for whenever "Plan A" (Line arrays in the Living Room) and "Plan B" (reduced Line Arrays in the Living Room) are rejected and I end up hauling all the boxes to the basement . In that case I would still have some subwoofers with the TV on the main floor.
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post #17 of 24 Old 08-25-2019, 10:00 PM
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Originally Posted by Will P View Post
Yes, those are the subwoofers vents. The opening is 4inx12in when cover removed. There is some chuffing at high SPL although for casual listening in the living room (at -15 db) they are still fine.
The in-floor subs are my "Plan C" - for whenever "Plan A" (Line arrays in the Living Room) and "Plan B" (reduced Line Arrays in the Living Room) are rejected and I end up hauling all the boxes to the basement . In that case I would still have some subwoofers with the TV on the main floor.
Do you hear the chuffing with the vent covers removed, or only with them on? Do you always remove them when listening?
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post #18 of 24 Old 08-25-2019, 10:24 PM - Thread Starter
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Do you hear the chuffing with the vent covers removed, or only with them on? Do you always remove them when listening?
The vent covers stay in place. I placed the tower speakers so they keep the vent covers in place with one corner so vent covers not to rattle (you can see it in the pictures). You can feel the air moving through the vents when playing but no chuffing sound. That might be due to the fact that the actual drivers opening inside is 4in x 8in (the channel you see on the pictures).
Again, that is "casual" listening. The subwoofers are probably -10dB from their Xmax.
If you start playing them at Xmax there is still no chuffing noise but you can start hearing the compression inside (distortion due to compression) which is to be expected.

Extra bonus is the increased low frequency output from the tower speakers (down firing ported 2.5 way; 2x6.5in, 1in). It's due to the subwoofer cavity 4in x 8in x 40in which is right below the tower speakers base.. Everybody in the house noticed that right away. It's a nice LF extension, not boomy at all.
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post #19 of 24 Old 08-26-2019, 01:27 PM
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Originally Posted by Will P View Post
Speakers: Dayton Audio RSS265HO-4 (x32; infrasubs, L/R Line Array), Dayton Audio RSS265HF-8 (x32; woofer subs, L/R Line Array), Dayton Audio RS100T-8 (x48; mids, L/R Line Array); Dayton Audio AMT PRO-4 (x20; tweeters, L/R Line Array); Dayton Audio DCS205-4 (x16; in-floor subs); PSB CW383 (x4; surrounds);
Amplifiers: Behringer NU4-6000 (x6) - infrasubs and subs amps; Crown XLS 1500 (x4); Crown XLS 2500; Crown XTi4002;
Total power: 36kW
I just have to find the time to put them together.

Cheese us! haha

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post #20 of 24 Old 08-26-2019, 05:08 PM - Thread Starter
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The in-floor subwoofers got built and installed in 2011.

It took me from 2011 until 2015 for the OB Line Array project design to solidify.
It's now 2019 and the drivers are still in the shipping boxes and unpacked. All my free time went into helping my wife with finishing the house renovation.

I hope I find some time in the next few years to put them together.
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... someone said "Music is Art, Sound is Engineering" ...
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post #21 of 24 Old 08-26-2019, 07:36 PM
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I hope you do, as well!
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post #22 of 24 Old 08-27-2019, 06:36 AM
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That's an awesome idea, and it looks like you did a great job with it. I remember seeing an ad for a really high end in-wall subwoofer system that did something similar. I think it might have been a bunch of 6" drivers or something...

Yep, it was the BG Radia BGX-4850 system. Looks like it used twelve 4" woofers and cost $7,000 back in 2009. I'd say you put together a great alternative.

https://www.soundandvision.com/inwal...bwoofer_system


Ah, I see now that the 4840 system actually uses four of the 12-driver modules, for a total of 48 drivers. How many more of these can you fit in the room???

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post #23 of 24 Old 08-27-2019, 11:24 AM - Thread Starter
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Quote:
Originally Posted by kagtha View Post
Simply unbelievable. Does OB mean open baffle?

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Yes, the Line Arrays are to be Open Baffle type.
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post #24 of 24 Old 08-27-2019, 05:42 PM - Thread Starter
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Ah, I see now that the 4840 system actually uses four of the 12-driver modules, for a total of 48 drivers. How many more of these can you fit in the room???
Well, if it was up to me I would have put 8 in-floor subwoofers, spaced 32in on center..

Knowing well that I was facing an uphill battle I entered the negotiations asking for 5 subwoofers. My wife cooperated.. At the end I got permission to have 2 subwoofers installed. Great! 2 is better than none
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