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Old 12th October 2012, 03:20 PM   #1
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Default Bookshelf Sub ideas?

I'm building a small amp/bookshelf setup. I've got some speakers based on the overnight sensation design done. They're great and plenty loud for my needs. Clearly they need a sub however.

So, I still want to keep the setup small. Yes, I know, I know... small and sub don't go together... I'm just looking for ideas. Ideally I'd like the sub to be part of the amp. I'm crazy right? Anyway, the amp and transformer aren't all that big. So I could likely fit them in the sub box. Basically, look at your standard Stereo receiver... that's about how big I want it.

My ridiculous Infinity perfect 12 in my car isn't much bigger and that thing can make my hair stand on end. I don't even need 1/10th of that output so there's got to be a way to get something more compact.

Any ideas would be appreciated. Thanks!
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Old 12th October 2012, 03:46 PM   #2
djn is offline djn  United States
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There is a sub called the Trisca (I think) over on Part Express DIY projects. I've always thought it would be a great sub in a small room....but I've never heard one so take it with a grain a salt.

Does your small room butt up to a large space like garage, attic, basement??? You could go IB = infinite baffle.

http://www.parts-express.com/project...ofer-projects/
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Last edited by djn; 12th October 2012 at 03:49 PM.
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Old 12th October 2012, 04:13 PM   #3
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hmm... passive radiator. I've not tried one of those. So that increases your effective surface area?
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Old 12th October 2012, 04:37 PM   #4
djn is offline djn  United States
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and it also acts as a ported, but in a sealed kind of way. I don't know the physics, but I like the sound of PRs better than ports.
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Old 12th October 2012, 05:14 PM   #5
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Quote:
Originally Posted by djn View Post
and it also acts as a ported, but in a sealed kind of way. I don't know the physics, but I like the sound of PRs better than ports.
The TB W6-1139SG will hit 40Hz in a 11L ported cabinet (I went for a 2" vent, ~9" long), and go pretty loud doing it.

Sensitivity is low, but that was always going to be the case.

If your music collection requires <35Hz stuff, I'd advise looking elsewhere: those drivers are good, but not that good.

A pair sealed with eq would do it, but your maxSPL is severely limited.
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Old 12th October 2012, 05:17 PM   #6
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I'm thinking of a small double fold T-TQWP.. With maybe dual 4" or 5" drivers.

I just built a small single fold with two cheap MCM 6.5". Works very good to 35hz but probably a little big for you.
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Old 12th October 2012, 05:52 PM   #7
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Originally Posted by bender460 View Post
I'm thinking of a small double fold T-TQWP.. With maybe dual 4" or 5" drivers.

I just built a small single fold with two cheap MCM 6.5". Works very good to 35hz but probably a little big for you.
Ah... now that's the sort of thing I was looking for. It took me 10min just to figure out what it was, and it looks absolutely ridiculous. Any resources you can recommend? My Google skills are failing me in this search... perhaps they are referred to by another acronym or some such?
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Old 12th October 2012, 08:29 PM   #8
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by charliemopps View Post
... it looks absolutely ridiculous...
Agree..when made in a rush..

Quote:
...Any resources you can recommend?...
Do a search here at DIYaudio , I've posted a few...

Quote:
My Google skills are failing me in this search... perhaps they are referred to by another acronym or some such?
Search for T-TQWT or T-QWP

Here are more examples:

b
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