A bench style cabinet subwoofer 2x15 closed - diyAudio
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Old 20th November 2012, 12:50 PM   #1
Juhazi is offline Juhazi  Finland
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Default A bench style cabinet subwoofer 2x15 closed

Hi, I'm planning a big subwoofer for my rather small home theater room. The room is 2,6x3,65x2,5m (9,5 m2) with low RT60. I watch movies and listen to music with moderae volume, so my main goal is to get fast and precise bass. The main speakers are concentrics in closed cabinets and they go linearly down to 60Hz, the sub,s xo is 80Hz and I use a Hypex DS plate amp.

The idea is to make a 400-450L closed cabinet for two 15" elements. The cabinet must have the form of a closed bench and it will sit below the screen right next to the wall and from corner to corner.

The elements could be Dayton DCS380-4 (VAS 233L) and they are cheap. Perhaps later on I can update to RSS390

Whic cabinet style do you prefer and why? 1) woofers down or 2) woofers on vertical slots
Pictures here: (the 400L version shown without the top panel)
Attached Images
File Type: jpg sub450 kuva.jpg (18.3 KB, 837 views)
File Type: png sub400 kuva.png (20.9 KB, 816 views)
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Last edited by Juhazi; 20th November 2012 at 02:57 PM.
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Old 20th November 2012, 01:04 PM   #2
adason is offline adason  United States
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that's a big sub...I would go isobarick for more compact sub
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Old 20th November 2012, 01:06 PM   #3
adason is offline adason  United States
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...and btw, I do not prefer any of those two arangements, first one will suffer driver sag, second is ugly...
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Old 20th November 2012, 01:47 PM   #4
rho is offline rho  Belgium
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Why do you think you need 2x 15" woofers for such a small room? That's just insane.
I have the same size room as a dedicated listening area and I'm building a sub using 1 12" driver. That will be plenty!
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Old 20th November 2012, 02:03 PM   #5
tb46 is offline tb46  United States
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Hi Y'all,

If the OP is shooting for e.g.: 105dB @ 15Hz, this would just barely do while being slightly above Xmax (, and that is assuming some room gain).

Having a nice bench never hurt.

Regards,
Attached Images
File Type: jpg DCS380_Input.jpg (35.5 KB, 793 views)
File Type: jpg DCS380_SPL.jpg (31.8 KB, 765 views)
File Type: jpg DCS380_displacement.jpg (28.4 KB, 734 views)
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Old 20th November 2012, 02:23 PM   #6
rho is offline rho  Belgium
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Quote:
Originally Posted by Juhazi View Post
I watch movies and listen to music with moderate volume, so my main goal is to get fast and precise bass.
I don't think this matches with the 15Hz, 105dB assumptions.
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Old 20th November 2012, 02:52 PM   #7
Juhazi is offline Juhazi  Finland
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Nice comments, I must clarify my intentions:
- the room is a mancave-theater-guest room. Functionality before esthetics!
- I want to make a bench anyway
- I want to try big closed sub. Now I have 2 separate 10" vented subs playing.
- I'm really not after maximum spl but fast and controlled (bass drum, double bass etc.)
- I want to have two elements (subs) because that helps to kill room modes (Geddes multisub arrangement, and I can even have a separate sub no3!)

adason said that no2 is ugly. The top panel is missing in the scetch, I'm planning to make it of a melamine-coated board. The box could be thickest possible LDF floor-board. The openigs for element could be open of with some grill., Yes, the box must be divided internally to prevent standing wave at around 82Hz
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AES Associate Member / My DIY speaker history: -74 Philips 3-way, -82 Hifi 85B, -07 Zaph L18, XLS10+PR/Hypex, -08 CSS125FR, -08 Hifitalo AW-7, -08 TangBand FR, -09 MarkK ER18DXT, -13 PPSL470, -13 AINOgradient

Last edited by Juhazi; 20th November 2012 at 03:02 PM.
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Old 20th November 2012, 03:19 PM   #8
rho is offline rho  Belgium
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OK, that should be doable with 2 15" subs sealed.
I'm not sure the way you want to place the subs is best for eliminating room-modes.
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Old 20th November 2012, 03:54 PM   #9
Juhazi is offline Juhazi  Finland
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I know the Geddes multisub idea and I think it is The way to do it. mehlau.net > audio > multisub

BUT I'm addicted to the bench idea. And I want to try if I can get the impact of big membranes. I'm also tempted to put 4 Dayton 15"'s side by side in the front panel or bottom! Talk about pressurization then, but that's definitely an overkill in my small room!
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AES Associate Member / My DIY speaker history: -74 Philips 3-way, -82 Hifi 85B, -07 Zaph L18, XLS10+PR/Hypex, -08 CSS125FR, -08 Hifitalo AW-7, -08 TangBand FR, -09 MarkK ER18DXT, -13 PPSL470, -13 AINOgradient

Last edited by Juhazi; 20th November 2012 at 03:57 PM.
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Old 20th November 2012, 04:13 PM   #10
adason is offline adason  United States
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Juhazi, do not discard my idea of 2x15" isobarick...
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