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Old 12th November 2004, 08:09 AM   #1
shaunly is offline shaunly  United States
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Default low bass in small box

I'm just wondering, how do companies like Bob carver or sunfire get there subs very low like around 18-25hz in such a small enclosure. I see some subs that is only about 12in. square sealed box that get's crazy lows. I ask this because I am looking to built a home sub for my house and I want it small but still be able to get nice lows.
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Old 12th November 2004, 08:29 AM   #2
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Massive excursion and huge power. Also slight twisting of the response figures, e.g. not using -3dB point but -6dB or even -10dB, and taking room gain into account.
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Old 12th November 2004, 11:26 AM   #3
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They claim 59mm p-p excursion. I'm not sure if that is xmax or xsus, but it's a lot for a 10" driver!

They use passive radiators which allow the smallest box with 20 Hz extension.

The distortion is probably quite high.

If you want to do better for less money and don't expect it to be quite so small:

* get a high excursion driver like the Stryke/AE AV12
* get a pair of 15" passives
* put it in a reasonably sized box
* 500w plate amp
* BFD for eq

When you realise the price you pay when you make it very small, you will probably want to make it bigger.
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Old 12th November 2004, 11:32 PM   #4
shaunly is offline shaunly  United States
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I have 1.25cuft to work with. Which sub would be the best for the space I have. I'm just trying to get it under 30hz.
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Old 13th November 2004, 12:32 AM   #5
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Quote:
Originally posted by shaunly
I have 1.25cuft to work with. Which sub would be the best for the space I have. I'm just trying to get it under 30hz.

A Peerless XLS with a passive radiator a small box will get down. I have a 10" version that measures flat deep into the 20's in my office. Search for XLS and you will find a ton of hits. There's a new version called XXLS too.

The 12" needs a box that's about 1.25 ft^3 (35 liter). The 10" can go in a box as small as 20 liters nominal. When ordering the passives, be aware of how much moving mass they have; There are two versions of each PR. Of course, if you get the lighter one, you can add mass by attaching washers or whatever.

http://www.d-s-t.com/main/tech/appxls2.htm
http://www.d-s-t.com/main/tech/appxls12b.htm
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Old 13th November 2004, 06:30 AM   #6
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Music or HT or both?
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Old 13th November 2004, 06:43 AM   #7
shaunly is offline shaunly  United States
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that's a very nice sub, but it's kinda over my budget.
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Old 13th November 2004, 06:45 AM   #8
shaunly is offline shaunly  United States
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Quote:
Originally posted by paulspencer
Music or HT or both?
both
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Old 13th November 2004, 07:01 AM   #9
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Sounds like a job for a 12" with a pair of passives. XLS or AV12 are both good candidates which work well in small boxes. The latter with more excursion (double) will have more output, probably as much as two XLS subs.
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Old 13th November 2004, 07:44 AM   #10
shaunly is offline shaunly  United States
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Quote:
Originally posted by paulspencer
Sounds like a job for a 12" with a pair of passives. XLS or AV12 are both good candidates which work well in small boxes. The latter with more excursion (double) will have more output, probably as much as two XLS subs.

those are both very nice drivers, but im on a tight budget, so I can't really get those. Probably later on when I start building more speakers and have more experience, but more now, it's got to be something cheap
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