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jeffslife
Joined: 17 Apr 2010
Posts: 4190
Location: ohio usa
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| Posted: Fri Jul 18, 2014 5:54 pm Post subject: Is there too much space for subs ? |
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Most of what I know about subs comes from my time in car stereo installation. I know that sealed subs ( the only kind I would use) need a set amount of space inside the box to perform correctly. In car stereo the trick was to make a box with the correct volume that would fit properly inside the car. I don't use powered subs in my HT, I use a class D amp and two subs. I once heard a sub, An 18 inch that a guy had in his house stereo unit. It was in a box roughly twice the size of a refrigerator.He claimed more space meant more bass.
I was thinking about using my riser as a cabinet for my subs. This would solve a lot of problems. I was just wondering if he was right and there is logic to his giant box. If so I might try it. Tell me what you think. Thanks.
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Fri Jul 18, 2014 7:10 pm Post subject: |
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It's really going to depend on the type of speaker, and what it's designed to be used with. Parts Express sells some pretty cheap speaker design software. You enter some parameters of the speaker, and it will tell you what the frequency response is. Well worth the money for someone like you that is always experimenting.
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ecrabb
Forum Moderator
Joined: 13 Mar 2006
Posts: 15909
Location: Utah
TV/Projector: JVC RS40, Epson 5010
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| Posted: Fri Jul 18, 2014 9:12 pm Post subject: Re: Is there too much space for subs ? |
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| jeffslife wrote: | | I know that sealed subs ( the only kind I would use) need a set amount of space inside the box to perform correctly. In car stereo the trick was to make a box with the correct volume that would fit properly inside the car. |
That's somewhat accurate, but clumsy at best. How I would put it is that in a car, you have a very finite amount of space to use for a box. Once you determine the size of the box you can use, then you can find a sub driver with the 'compliance' (Vas and Cms of the driver) to match the box size. In general, a less compliant (stiffer suspension) driver can be in a larger box, a more compliant driver (softer suspension) needs a smaller box.
Now, that's just a very general set of guidelines. With car audio, where people are more concerned with max SPL and power-handling (which is stupid, IMHO).
To get back to your question, what you're looking for with home theater if you want a sealed cabinet is something similar to what I built. A 15-18" driver, a low Fs (resonant frequency), and a Vas and Cms that dictates 3-4 cuft. That's a little bigger than dorm fridge size… Pushing under cabinet fridge size.
There are some great flat-pack subs out there where people have already designed a great, well-braced enclosure for a specific driver or two as a good match for good power-handling and great extension. That way, you don't have to cart home a sheet of MDF, spend all day cutting it, fixing mistakes, trying to make it fit.
For instance...
http://www.diysoundgroup.com/sealed-subwoofer-flatpacks/3-sub-flat-pack.html
Add this driver:
http://www.parts-express.com/dayton-audio-um15-22-15-ultimax-dvc-subwoofer-2-ohms-per-coil--295-514
So, for say $350 (with stuffing, terminal, screws, etc. - plus an amp), and a few hours in the garage with glue and an air nailer, and you can build a sub that's very nice looking and very competitive with commercial subs that cost 3-4 times the price.
SC
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