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#212939 - 06/25/08 12:59 AM Dual Rotary Subs Used at Trinity Church
CV Offline
Founder, Axiom Upgrade Club
shareholder in the making

Registered: 07/20/06
Posts: 11064
Loc: Richland, WA, USA
I would have liked to have been there:

AVS Forum - Dual Rotary Subs Used At Trinity Church
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#212940 - 06/25/08 01:28 AM Re: Dual Rotary Subs Used at Trinity Church [Re: CV]
fredk Offline
axiomite

Registered: 12/06/07
Posts: 6969
Loc: Canada
Absolutely fascinating. I posted a link to that sub here a while back and it was greeted with scepticism.

I wonder how many of these things he sells in a year?
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#212941 - 06/25/08 01:53 AM Re: Dual Rotary Subs Used at Trinity Church [Re: CV]
JohnK Offline
shareholder in the making

Registered: 05/11/02
Posts: 10308
Very interesting, Charles. Apparently the 105dB level at 6Hz didn't cause an appearance of the "brown note" syndrome among those present at the recording session. It'll also be interesting to see how the point Dr. Rubinson raised at the end will be answered.
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#212980 - 06/25/08 01:27 PM Re: Dual Rotary Subs Used at Trinity Church [Re: CV]
JaimeG Offline
aficionado

Registered: 12/25/02
Posts: 556
Loc: Ashburn, VA
Very interesting! Thanks for posting this CV.
On one of the replies there's a link to a video of 'Cameron' playing the Trinity organ. It's a must see...
impressive foot work... and the goofiest looking slippers ever!! :P

http://www.youtube.com/watch?v=pQxyQktNFwc
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#212993 - 06/25/08 02:14 PM Re: Dual Rotary Subs Used at Trinity Church [Re: JaimeG]
CV Offline
Founder, Axiom Upgrade Club
shareholder in the making

Registered: 07/20/06
Posts: 11064
Loc: Richland, WA, USA
Yeah, pretty cool video. I know it's kind of backwards, but I'm just thinking about how he's wasting his talent and should be playing video games with that coordination. Ha ha.

I'll be interested to see reviews of the recording when it's released. My system will never be able to reproduce the full range, but still, seems like fun.
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#213001 - 06/25/08 02:41 PM Re: Dual Rotary Subs Used at Trinity Church [Re: CV]
Capn_Pickard Offline
connoisseur

Registered: 03/09/04
Posts: 1056
Loc: Arlington, VA (NOVA)
I don't get the theory. Does the sub's "Speaker" spin like a fan? And what, does that flexibility give it a better lower frequency response. I guess I am dumb.

And yes, the organist was pretty damned amazing. He was like that octopus bartender in Roger Rabbit.

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#213006 - 06/25/08 02:59 PM Re: Dual Rotary Subs Used at Trinity Church [Re: Capn_Pickard]
JaimeG Offline
aficionado

Registered: 12/25/02
Posts: 556
Loc: Ashburn, VA
yeah, I wonder how it works too... Kinda of makes sense to use a fan since low frequencies 'moves' a lot of air.
My guess is that the fan blades vibrates somehow or the fan is mounted on a regular woofer piston... dunno gotta check the website.


Edited by JaimeG (06/25/08 03:01 PM)
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#213008 - 06/25/08 03:03 PM Re: Dual Rotary Subs Used at Trinity Church [Re: JaimeG]
fredk Offline
axiomite

Registered: 12/06/07
Posts: 6969
Loc: Canada
Find his website. He posts a lot of info on the physics/theory of this sub.
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#213009 - 06/25/08 03:09 PM Re: Dual Rotary Subs Used at Trinity Church [Re: CV]
JaimeG Offline
aficionado

Registered: 12/25/02
Posts: 556
Loc: Ashburn, VA
This interweb thing is awesome :P

Here's an excerpt of how it works from his website:

A motor controller and electric motor rotate a set of blades at a constant speed. The TRW-17 Rotary Woofer pitch mechanism uses a conventional voice coil and magnet assembly. This is connected to your amplifier to pitch blades in proportion to the applied audio signal. As the blades pitch while rotating a pressure wave is generated, the degree of pitch controls the amplitude of the pressure wave. Air is allowed to transition through the blades. Thus oscillating the pitch of the blades creates sound while they are rotating .


Edited by JaimeG (06/25/08 03:11 PM)
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#213023 - 06/25/08 05:17 PM Re: Dual Rotary Subs Used at Trinity Church [Re: JaimeG]
Capn_Pickard Offline
connoisseur

Registered: 03/09/04
Posts: 1056
Loc: Arlington, VA (NOVA)
Sounds all a bit "hocus pocus" to me. Besides, why do I need 3Hz sound coming from my speakers again? The room already shakes enough as it is at 20Hz

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