Who makes the lowest distortion pro-sound subwoofers? - Page 3 - diyAudio
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Old 22nd February 2008, 10:10 PM   #21
iand is offline iand  United Kingdom
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Quote:
Originally posted by thadman
How reasonable would a 30-40hz horn be?
In a single box -- pretty unreasonable... :-)

Ian
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Old 22nd February 2008, 11:02 PM   #22
pkm is offline pkm  New Zealand
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Big difference between a 40hz horn and a 30hz horn

Note that the labhorn is 850Litres,32hz cutoff, four on the ground or one in the corner.It uses 2 x lab12 woofers.
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Old 22nd February 2008, 11:16 PM   #23
iand is offline iand  United Kingdom
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Quote:
Originally posted by pkm
Big difference between a 40hz horn and a 30hz horn

Note that the labhorn is 850Litres,32hz cutoff, four on the ground or one in the corner.It uses 2 x lab12 woofers.
Most people would say that 3400l is pretty unreasonable :-)

Ian
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Old 26th February 2008, 01:29 AM   #24
thadman is offline thadman  United States
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How do horns operate below their cutoff? as direct radiators?
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Old 26th February 2008, 03:02 AM   #25
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If you want tons of super low output, I don't see how you can beat a pile of cheap, big woofers IB. For under $900 you could do 8 Mach 5 MJ18s IB.

http://www.mach5audio.com/product_in...c6734e69be3c75

That right there is 8230 cm^2 of surface area that can move about an inch peak to peak with negligible distortion. They're basic, well built drivers- a much better value (in this case) than some of these high tech PA drivers that have a lot of money sunk into lowering distortion that will already be negligible in your case.
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Old 26th February 2008, 10:06 AM   #26
iand is offline iand  United Kingdom
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Quote:
Originally posted by Rybaudio
If you want tons of super low output, I don't see how you can beat a pile of cheap, big woofers IB. For under $900 you could do 8 Mach 5 MJ18s IB.

http://www.mach5audio.com/product_in...c6734e69be3c75

That right there is 8230 cm^2 of surface area that can move about an inch peak to peak with negligible distortion. They're basic, well built drivers- a much better value (in this case) than some of these high tech PA drivers that have a lot of money sunk into lowering distortion that will already be negligible in your case.
Lots of displacement per dollar, but needs a box the size of a garden shed :-)

Ian
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Old 26th February 2008, 11:23 AM   #27
MaVo is offline MaVo  Germany
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Quote:
Originally posted by thadman
How do horns operate below their cutoff? as direct radiators?
Horn gain doesnt stop directly below cutoff, it is more like smooth rolloff, but yes, front loaded horns with a closed rear chamber behave as direct radiatiors in a closed box if the frequency is low enough. that is because the wavelengths get so long, that the horn becomes acoustically invisible, so only the closed box remains as the enclosure.

Quote:
Originally posted by iand


Lots of displacement per dollar, but needs a box the size of a garden shed :-)

Ian
Well, he said IB, didnt he?
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Old 26th February 2008, 03:42 PM   #28
thadman is offline thadman  United States
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The obvious solution seems like a 5-way, but that starts to get quite complex...

IB below 40/50hz
Hornloaded/Ported/Sealed Prosound bass above 40/50hz

Hornloaded looks interesting, but I'm not interested in enclosures >2' wide x >2' tall x >2.5' deep as I'd like to stack them above the midrange enclosure to operate as an array. Upper end XO would be 150-200hz.
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Old 26th February 2008, 08:14 PM   #29
MaVo is offline MaVo  Germany
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How do you arrive at 5 way?

ib < 50hz, woofer < 200hz, midrange < 1khz, 1 inch compression driver < 20khz

you could even skip the midrange with the right midwoofers making it three way.
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Old 26th February 2008, 08:22 PM   #30
thadman is offline thadman  United States
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subwoofer (<40hz)
woofer (>40hz-150hz)
lower midrange (>150hz-600hz)
upper midrange (>600hz-2.4khz)
treble (>2.4khz)
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