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Old 7th November 2009, 09:08 AM   #1
juxta is offline juxta  Australia
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Default P.A. sub project

Hey I'm looking at drivers for a P.A. sub project

Freq range needed:30hz to 100hz

Spl needed: Greater than 100db 1w/1m

I've seen a few around but thought someone with experience may be the best bet for finding good info..

I am open to any design suggestions

Sub to be used outdoors for electronic music

Any thoughts, info, stories, pics would be a great help

Thanks
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Old 7th November 2009, 03:47 PM   #2
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Well, your requirements are tough ones. If it could be done, the cabinets would be huge and they would probably require corner loading.
You may want to re-think you requirements.
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Old 7th November 2009, 04:55 PM   #3
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i'd put the -3dB at 45 Hz, this is way low enough for PA and much easier to accomplish.
30 is also doable but with laaaarge cabinets.

labhorn anyone?
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Old 7th November 2009, 04:59 PM   #4
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As before in the other threads: many small horns with a cheap MCM 55-2421 acting with great mutual coupling.
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Old 7th November 2009, 05:24 PM   #5
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I have posted a simulation of a quad 55-2421 driven tapped horn that meets these criteria over in your other thread.
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Old 7th November 2009, 08:03 PM   #6
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Quote:
Originally Posted by davygrvy View Post
As before in the other threads: many small horns with a cheap MCM 55-2421 acting with great mutual coupling.
Hmmmm, many small horns and mutual coupling. That can add up to a huge box or footprint. Some of the TH designs that go down to 30Hz assume a corner loading. Do PA setups have the flexibility of an "available corner"?.

The criteria are still going to force you to build something huge that may also need corner placement.
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Old 7th November 2009, 08:48 PM   #7
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Quote:
Originally Posted by WithTarragon View Post
The criteria are still going to force you to build something huge that may also need corner placement.
We're assuming 1/2 space. Huge probably, but many boxes move and pack easier.
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Old 8th November 2009, 01:45 AM   #8
juxta is offline juxta  Australia
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Quote:
Originally Posted by littlemike View Post
I have posted a simulation of a quad 55-2421 driven tapped horn that meets these criteria over in your other thread.
Thanks mike I decided to throw the doors open to any suggestions in case horn loading wouldn't happen.. Not that I don't have hope
Becoming a bit of a messy threader!
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Old 8th November 2009, 01:49 AM   #9
juxta is offline juxta  Australia
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Quote:
Originally Posted by WithTarragon View Post
Hmmmm, many small horns and mutual coupling. That can add up to a huge box or footprint. Some of the TH designs that go down to 30Hz assume a corner loading. Do PA setups have the flexibility of an "available corner"?.

The criteria are still going to force you to build something huge that may also need corner placement.
I've been thinking about building a collapsible corner but how much building do you need to get effect?
Would subs with fake corner still produce?
Feels like a wacky scientist thing to say, i'm prepared to be embarassed.....
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Old 8th November 2009, 04:44 AM   #10
juxta is offline juxta  Australia
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Is it impossible to get 30hz to 100hz and 100db 1w/1m from a sealed or ported normal box sub?
I've used some 18' box subs an they've been good with only my battered ears as testers, are they actually doing very little hz and db wise?
BEHRINGER VP1800S 18" 1600 are only $300 but only reach 40hz I think they say....

Last edited by juxta; 8th November 2009 at 04:50 AM.
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