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running123 30th November 2011 09:51 PM

5 hz bass @ 125 db in room
If I wanted a sub to do 5-20 hz at 125 db at 5 meters in a 8000cf room, how would I do this. I want clean output, I can eq the hell out of it to get a flat response, but I don't want to hear drivers moving etc. Thanks.

Budget is 60000.

revboden 30th November 2011 09:58 PM

Eminent Technology: home

you'll need 3

Don Hills 30th November 2011 10:28 PM

To do it with conventional drivers:
Assume 18 inch drivers with a 1/2 inch xmax.
You'll need 40 of them in sealed enclosures to reach 125.5 dB. You'll need more if your room is not nearly airtight and/or has flexible walls / floor / ceiling.

Boscoe 30th November 2011 10:51 PM

That rotary driver thing isn't clean! I would go with the Fostex 31.5" drivers if it were me and I simmed about 15 of then once with compromise got them to 3Hz although they do have very limited xmax.

May I ask what this would be for?

wranders 30th November 2011 10:51 PM

My BFM THT with 2x15 Dayon DVCs flexes my walls pretty well at 5hz. Too bad I don't have a decibel meter, then I'd tell you what it's at.

m R g S r 1st December 2011 01:12 AM

Sorry 2 15's (no matter what the xmax) aren't hitting 125db at 5hz.

sreten 1st December 2011 01:21 AM


5Hz at 125dB at 5m not 1m ?, your having a laugh, that will
need a lot more than 3 of those rotary subwoofers, about 15.

However it might be able to be approached if you want 5Hz and only 5Hz via
some highly resonant arrangement with a dreadful frequency and transient
response, though you might need all of the next rooms volume to do it.

e.g. arranging the rear loading of the rotary drivers to resonate at 5Hz.

rgds, sreten.

wranders 1st December 2011 01:22 AM

You could always double up on cabs if you have the room.

18Hurts 1st December 2011 02:05 AM

I think you are in the wrong forum for 5Hz at 125 dB

Those devices are called "sonic boom generators" so call Thomas Danley at Danley Sound Labs and he can tell you if 60,000 pounds would do it. Tom built sonic boom generators before building speakers so he would be the man to ask.

NEO Dan 1st December 2011 05:25 AM

Why not just PM him, he is a member here...

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