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Old 15th April 2011, 04:58 PM   #131
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Default A lot easier to build and better performance

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.
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Old 15th April 2011, 05:33 PM   #132
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Wow! Did you build the unit that modulates the fan? What kind of db is it produce?
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Old 15th April 2011, 06:33 PM   #133
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Geez! Now that's using your imagination! Do go on -- inquiring mind want to know
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Old 15th April 2011, 07:38 PM   #134
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Default The enclosure for the Rotary subwoofer

Quote:
Originally Posted by teachjava View Post
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!!!
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Old 15th April 2011, 10:47 PM   #135
DrDyna is online now DrDyna  United States
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Quote:
Originally Posted by awraudio View Post
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?
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Old 26th August 2013, 12:47 PM   #136
Rewind is online now Rewind  Sweden
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More pics from Norway!

12 meter høyttaler fra låven - Arkiv - Drammens Tidende

Is Eminince LAB 12 an ok driver for this type of horn? I was planning a Labhorn but I am want to reach lower than 35Hz.

http://www.eminence.com/pdf/LAB_12.pdf

Last edited by Rewind; 26th August 2013 at 12:50 PM.
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Old 28th August 2013, 04:58 PM   #137
sine143 is online now sine143  United States
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Quote:
Originally Posted by awraudio View Post
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!!!
how large does the chamber behind the fan (aka your basement) need to be in order for the rotary sub to work properly?
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Old 28th August 2013, 05:30 PM   #138
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Quote:
Originally Posted by sine143 View Post
how large does the chamber behind the fan (aka your basement) need to be in order for the rotary sub to work properly?
Room sized with return air plenums all soundproofed to reduce the air noise created by the 800 rpm fan.
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Old 28th August 2013, 05:37 PM   #139
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Quote:
Originally Posted by Rewind View Post
Is Eminince LAB 12 an ok driver for this type of horn? I was planning a Labhorn but I am want to reach lower than 35Hz.
A Lab 12 would work well, but folding a bass horn is a far more efficient use of lumber than a straight horn.

Back in 1922 Magnavox built a horn that makes the "12-meter-hoyttaler-fra-laven" look like a toy .

Art
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Old 28th August 2013, 09:13 PM   #140
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by weltersys View Post

Back in 1922 Magnavox built a horn that makes the "12-meter-hoyttaler-fra-laven" look like a toy .

Art
big toy tho
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