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Old 30th July 2009, 02:46 PM   #1
Defo is offline Defo  Norway
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Default High efficiency 25hz sub - driver tips?

Looking for an high efficiency sub driver (93db+) which can do 115db at 25 hz, and a maximum 150 liters enclosure. Around 300 usd per driver / pair.

Any recommendations?
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Old 30th July 2009, 03:23 PM   #2
jbell is offline jbell  United States
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http://www.diycable.com/main/product...roducts_id=691
http://www.diycable.com/main/pdf/Shiva-PR.pdf

Is this of interest?
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Old 30th July 2009, 03:35 PM   #3
Defo is offline Defo  Norway
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Not exacly high efficiency... But thanks for the reply!
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Old 30th July 2009, 05:43 PM   #4
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Default Re: High efficiency 25hz sub - driver tips?

Quote:
Originally posted by Defo
Looking for an high efficiency sub driver (93db+) which can do 115db at 25 hz, and a maximum 150 liters enclosure. Around 300 usd per driver / pair.

Any recommendations?
115dB at 25Hz half space is about 2000cc of displacement. A 12" will need to Xmax 4cm to do that, an 18" 1.6cm. A few of the pro 18's can do it, but their Fs is typically too high and may not work in a box that size.

Seems you are wanting a driver that will break Hoffman's Iron Law an do it for small $. Unlikely to happen.

Go look at Illka's subwoofer tests and see what can actually be achieved.
Sub tests.
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Old 30th July 2009, 05:59 PM   #5
Defo is offline Defo  Norway
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Default Re: Re: High efficiency 25hz sub - driver tips?

Quote:
Originally posted by Brett
115dB at 25Hz half space is about 2000cc of displacement. A 12" will need to Xmax 4cm to do that, an 18" 1.6cm. A few of the pro 18's can do it, but their Fs is typically too high and may not work in a box that size.

Seems you are wanting a driver that will break Hoffman's Iron Law an do it for small $. Unlikely to happen.

Go look at Illka's subwoofer tests and see what can actually be achieved.
Sub tests.
Hmm....

Ive modelled Eminence kappalite 3012LF in bassbox, and it gets pretty close if the simulations is correct. Ill take a look at that link though!

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Old 30th July 2009, 06:38 PM   #6
tinitus is offline tinitus  Europe
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I would look at either PrecisionDevices or RCF

Both have a few with low Fs around 27hz
And tune for 30hz

As I recal they have better Xmax than Eminence

Pro woofers with even more Xmax cost more

Why so loud anyway
Dont you want to keep you hearing for long
I can tell you that damaged hearing can be very painful
Besides, a building could easily be damaged as well

Such SPL are for outdoor use, or at least not small rooms
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Old 31st July 2009, 12:51 AM   #7
Defo is offline Defo  Norway
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JBL 2226H seems to handle my demands. At least according to my simulations.

I allready use a pair in my mains, but they are about to be switched to something smaller, so I might as well use one for sub duty The rising response needs to be equalized ofc. As well as a high pass filter at 26hz to protect the driver from overexcursion at frequenzies below fb.

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Old 31st July 2009, 12:56 AM   #8
tinitus is offline tinitus  Europe
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Driver 40hz Fs and box tuned to 25hz ?
Xmax 7.62mm ?

Are Xmax one way or p-p ?
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Old 31st July 2009, 01:01 AM   #9
Defo is offline Defo  Norway
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Quote:
Originally posted by tinitus
Driver 40hz Fs and box tuned to 25hz ?
Xmax 7.62mm ?

Are Xmax one way or p-p ?
No problem tuning below fs. The only loss is efficiency. Xmax is one way. Maximum excursion p-p before damage is 40mm...
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Old 31st July 2009, 05:45 AM   #10
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In the 2226H sim, it says 'No of Ports =0". What did you use for porting?
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