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Old 17th December 2011, 08:30 PM   #1
Boscoe is offline Boscoe  United Kingdom
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Default Small sub ideas.

So this is what I want...

-0dB to 25Hz (i'm okay with 30Hz)

A box no bigger than 40l.

I don't care what the size of the driver is as long as it's 10" or bigger or 2 x 8" drivers.

A box without a ridiculously long port.

Max SPL 110dB

Not SPL lower than 80dB at 1W.

No passive radiators.

Driver budget 350

This could well be a trick as I've been looking for the past few days and I haven't been satisfied, I belive it's because 99% of the drievr out there are shite tbh.

If you could help me that would be great.

Thanks
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Old 17th December 2011, 09:08 PM   #2
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Eminence Lab-15 in closed box, 40 liters will give you 110dB @ 20Hz in a sturdy roomcorner.

Dag
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Old 17th December 2011, 09:09 PM   #3
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Did you check on:

- Ciare 12.00SW
- BMS 12N630
- 2 x TangBand W8-670

?

Last edited by Sabbelbacke; 17th December 2011 at 09:14 PM.
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Old 17th December 2011, 10:23 PM   #4
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Quote:
Originally Posted by Boscoe View Post
So this is what I want...

-0dB to 25Hz (i'm okay with 30Hz)

A box no bigger than 40l.

10" or bigger or 2 x 8" drivers.

A box without a ridiculously long port.

Max SPL 110dB

Not SPL lower than 80dB at 1W.

No passive radiators.

Driver budget 350
Small , Loud , Low , pick two.

With all the limiters listed you can't get there from here.
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Old 17th December 2011, 11:01 PM   #5
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I think you are loosely interpreting Hoffmans Iron Law:
Small box
Deep Bass
High Efficency
The law states pick 2.
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Old 17th December 2011, 11:25 PM   #6
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well, yeah.

He could go small and low but the number of drivers needed to get the efficiency required exceeds the budget. Low and loud but then he also goes above box size limits. loud and small but won't go flat to 30Hz.

It could be done with passive radiators but that's out...
The port needed would fill the box...
No horn could be that size and tuning for the required SPL...

good luck,
rev.
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Old 17th December 2011, 11:51 PM   #7
sreten is offline sreten  United Kingdom
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Quote:
Originally Posted by Boscoe View Post

I belive it's because 99% of the drievr out there are shite tbh.

If you could help me that would be great.

Thanks
Hi,

Simply not true, though some are shite. You want a "magic" driver
that simply does not exist. The idea that only 1% of drivers are
designed properly for intended purpose is immensely naive.

They are not, they are constrained by the laws of physics.
Size is irrelevant, volume displacement is all that matters for SPL.

Your constraints indicate sealed, and a specified SPL capability
without a frequency point makes no sense for a sealed box.

rgds, sreten.
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Old 18th December 2011, 01:02 AM   #8
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In view of the fact that you specified you could live with something with a SPL
of 80 or higher you might look at using the Linkwitz transform circuite.

Linkwitz Transform Subwoofer Equaliser
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Old 18th December 2011, 06:26 AM   #9
mdocod is offline mdocod  United States
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Is this for a car, for a room, or are you wanting those sorts of results in free space at 1M?

Eric
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Old 18th December 2011, 07:21 AM   #10
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If used in a room, you could go for two high-excursion drivers like the sonic-10 from Carpower (+-25mm xmax linear) und put them in a 40l sealed Box, which gives you this, standing on the floor:
Click the image to open in full size.
Of course, three will do better... Some EQ, and you are there.

Is this for home-cinema?
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