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subs for small auditorium [message #51445] Wed, 03 October 2007 11:04 Go to next message
JeremyG is currently offline  JeremyG
Messages: 1
Registered: May 2009
Esquire
I’m looking for some suggestions on a sub or a pair of subs. The application is for PA use in an auditorium that is about 30x50. Construction is concrete and brick and seats 250+. It’s set up kind of like a theater and subs would be placed on the stage. Sound levels are less than 100db most of the time. The 80hz down range is where I want to add some undistorted reinforcement. I like the clean sound from the horns but I’m not sure this is right application for them. PA is a new adventure for me so any advise would be welcome.

Thanks Jeremy


Re: subs for small auditorium [message #51446 is a reply to message #51445] Wed, 03 October 2007 13:15 Go to previous message
Wayne Parham is currently offline  Wayne Parham
Messages: 18783
Registered: January 2001
Illuminati (33rd Degree)

A couple of subs come to mind: the three π and the four π subwoofer. The three π sub is a 12" woofer in a vented box and the four π sub is a 15" woofer in a vented box. You could also go with a four π-18, which is an 18" driver, but I don't think you'll need it.

I'd probably use two or four of the three π subs and place them together, within 1/4λ of each other at the crossover point. Run 'em in push-pull pairs for even better performance, by way of lower distortion.

Your room is going to be difficult because it's small and rigid. You'll have problems with room modes no matter what kind of subwoofer you use. If possible, have dampers installed.


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