Driver selection for compact subwoofer with LT. - diyAudio
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Old 19th July 2012, 12:28 PM   #1
rho is offline rho  Belgium
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Default Driver selection for compact subwoofer with LT.

I'm planning on building a compact subwoofer for (mainly but not exclusively) movies. I think a sealed enclosure with LT is the best choice in my situation.
- Smallish living room
- Listening levels are never excessive.
- Limited space to put a subwoofer
- Ample power available (Behringer Inuke NU3000DSP: should deliver 1500Wrms/4ohm)
- F3 as low as possible (aiming for 20Hz, Q =< 0.707)

Guesstimating the bracing and driver displacement for the build, I should be able to build something with a nett internal volume of 50 to 55 liter.
I think that a 12" driver would be the biggest that could perform nicely in such "small" enclosure.

What should I look for as far as T/S go?
I was thinking:
Fs = aim as low as possible
0,25 < Qts > 0.4
Vas = rather low
Xmax > 10mm one way
Rms < 4
Z = 4 ohm

The Rms spec seems important to me because I never set the volume really high. I think I'll be missing out on details when Rms is too high and the volume is set quite low.
Low distortion figures are always nice. :-)

Am I looking in the right direction or do I make some serious mistakes?
Any suggestions?

Might a car sub be the way to go?
My doubts about car subs:
- higher distortion figures (bigger tolerances due to extreme Xmax figures)
- higher Rms due to stiffer suspension

Budget: ~ 250. I might increase it up to 300 if this allows me to get the perfect driver for my application.
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Old 19th July 2012, 04:03 PM   #2
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Xmax is important for the LT-I've done a 10" in 0.126cf QTC 0.707 for my car and it's limitation is it's low Xmax-fine for the levels I listen at in my car-but if it moved it to my house it'd be overexcurting to fill my living room.

There are some excellent car drivers available, though there is a lot of crud to wade through to get there-55l is big for our 12" enclosures!

My driver is the Aliante 10Si:

Fs = 22.9
Qts = 0.28
Vas = 43.3
Xmax = 4mm one way
Rms = 9.129kg/s
Z = 4 ohm

So ticks all boxes except diameter and excursion, sounds very natural in my car-so I'd say your requirments seem spot on (though have never done LT in a house)

This looks to tick all boxes:
TC Sounds Epic 12" DVC Subwoofer 293-650
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Old 19th July 2012, 04:17 PM   #3
DrDyna is offline DrDyna  United States
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Quote:
Originally Posted by TheBaronGroog View Post

This looks to tick all boxes:
TC Sounds Epic 12" DVC Subwoofer 293-650
+1 on the TC Sounds drivers, you really can't go wrong with them. With the budget you have, you could probably do one of these:

TC Sounds LMS-R 12" DVC Subwoofer 293-658
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Old 19th July 2012, 06:33 PM   #4
rho is offline rho  Belgium
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Those look really interesting.
I do see some disadvantages with them (very high Le, limits upper frequency extension) but still very interesting drivers.
The Epic looks actually more interesting then the LMS-R. The Epic has lower Fs and looking at the T/S I suspect a less stiff suspension (lowers Rms).
Xmax is a little higher on the LMS-R.

I'll have tosee what they do in WinISD.
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Old 19th July 2012, 06:41 PM   #5
DrDyna is offline DrDyna  United States
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Quote:
Originally Posted by rho View Post
I do see some disadvantages with them (very high Le, limits upper frequency extension) but still very interesting drivers.
Well, if you're doing a single sub with placement away from your mains, you don't want them playing much over about 80 hz anyway.
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Old 19th July 2012, 07:39 PM   #6
rho is offline rho  Belgium
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You're right. I wasn't planning on crossing them over any higher then that.
The sub will most probably be placed next to the left main speaker.
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Old 20th July 2012, 02:28 AM   #7
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Look at the Dayton 12" HO drivers from Parts-Express. They'd be near the top of my list for any such design, because of the cost/performance ratio (particularly when they're on sale!)
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Old 20th July 2012, 05:17 AM   #8
rho is offline rho  Belgium
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Fs is a little high on those Daytons and from the distortion measurements I have seen (Titanic and LF series), they don't perform as good as most other woofers.

Last edited by rho; 20th July 2012 at 05:21 AM.
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Old 20th July 2012, 10:53 AM   #9
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Originally Posted by rho View Post
Fs is a little high on those Daytons and from the distortion measurements I have seen (Titanic and LF series), they don't perform as good as most other woofers.
Dayton's RS series is quite different to the Titanic series. The feedback on the Dayton RS series of drivers has tended to be VERY positive, particularly for a 12" driver that costs less than $150.
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Old 20th July 2012, 11:45 AM   #10
rho is offline rho  Belgium
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I'll have to investigate them a little more then.
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