8,8 meter basshorn "6090 Monster" - Page 14

awraudio · 15th April 2011, 04:58 PM

My rotary subwoofer goes to below 1 hz and is
good up to 25 hz!!!! Can move a open door .5"
between 1 and 5 hz; truly awesome. Matches
the impedance of the air at these very low frequencies.
Try building a horn that goes down to below 1 hz.

teachjava · 15th April 2011, 05:33 PM

Wow! Did you build the unit that modulates the fan? What kind of db is it produce?

carpenter · 15th April 2011, 06:33 PM

Geez! Now that's using your imagination! Do go on -- inquiring mind want to know

awraudio · 15th April 2011, 07:38 PM

Quote:

Originally Posted by teachjava

Wow! Did you build the unit that modulates the fan? What kind of db is it produce?

I built the enclosure for the rotary subwoofer, which included
modifying the floor for the opening. The rotary subwoofer is
Eminent technology TRW-17, designed by Bruce Thigpen. There
have been numerous diy builders that have been trying to build
a rotary subwoofer, but no one has been successful so far. The
amplifier for the rotary subwoofer is designed by Marchand
Electronics, with input from Bruce Thigpen. This small amplifier
is rated at 200 watts and is used to modulate the fan blades.
The real power comes from the ac circuit that rotates the
fan motor, and the rotary subwoofer will produce over 110 db at 5 hz!!!

DrDyna · 15th April 2011, 10:47 PM

Quote:

Originally Posted by awraudio

I built the enclosure for the rotary subwoofer, which included
modifying the floor for the opening. The rotary subwoofer is
Eminent technology TRW-17, designed by Bruce Thigpen. There
have been numerous diy builders that have been trying to build
a rotary subwoofer, but no one has been successful so far. The
amplifier for the rotary subwoofer is designed by Marchand
Electronics, with input from Bruce Thigpen. This small amplifier
is rated at 200 watts and is used to modulate the fan blades.
The real power comes from the ac circuit that rotates the
fan motor, and the rotary subwoofer will produce over 110 db at 5 hz!!!

That is absolutely fantastic. I only wish we didn't rent this house, I'd love to build one or two of those.

One question though, after a few days, do you have to turn up the volume and blow all the dust up out of the vent before you invite people over to walk dinosaurs?

15th April 2011, 06:33 PM	#133
carpenter Paper mache horn fabricator diyAudio Member Join Date: Mar 2002 Location: Oregon City, Oregon	Geez! Now that's using your imagination! Do go on -- inquiring mind want to know __________________ I enjoy audio so much that I constructed a web site. I share my ideas at: www.inlowsound.com

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15th April 2011, 05:33 PM	#132
teachjava diyAudio Member Join Date: Apr 2008 Location: Seattle, WA	Wow! Did you build the unit that modulates the fan? What kind of db is it produce?

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