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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: 11236
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: 7139
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?
_________________________
Fred

-------
Blujays1: Spending Fred's money one bottle at a time, no two... Oh crap!

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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: 10404
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.
_________________________
-----------------------------------

Enjoy the music, not the equipment.



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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
_________________________
The sailor does not pray for wind, he learns to sail. --Lindborg

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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: 11236
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)
_________________________
The sailor does not pray for wind, he learns to sail. --Lindborg

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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: 7139
Loc: Canada
Find his website. He posts a lot of info on the physics/theory of this sub.
_________________________
Fred

-------
Blujays1: Spending Fred's money one bottle at a time, no two... Oh crap!

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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)
_________________________
The sailor does not pray for wind, he learns to sail. --Lindborg

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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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#213044 - 06/25/08 07:18 PM Re: Dual Rotary Subs Used at Trinity Church [Re: Capn_Pickard]
fredk Offline
axiomite

Registered: 12/06/07
Posts: 7139
Loc: Canada
Because you can. Many would ask why you need your room to shake.

Its certainly unconventional, but it must work to some degree or it would not even have been considered for the recording that started this thread.

If it did not work reasonably well, I am willing to bet that both the recording company and the artist would have noticed.

It would be interesting to see how this device measures in conventional sub testing.

Its kinda funny the way we as a species react to the unconventional. I remember this guy by the name of Valekovski who had this theory back in the 40s/50s that mars sent out radio waves. Everybody called him a nut case (and he certainly had some other 'unconventional' beliefs. It took the rest of the world 15 years to catch up with him.

Maybe in 15 years every builder will be putting one of these into new houses. ;\)
_________________________
Fred

-------
Blujays1: Spending Fred's money one bottle at a time, no two... Oh crap!

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#213070 - 06/26/08 12:15 AM Re: Dual Rotary Subs Used at Trinity Church [Re: fredk]
BrenR Offline
connoisseur

Registered: 12/10/03
Posts: 3602
Loc: Winnipeg MB Canada
 Originally Posted By: fredk
Many would ask why you need your room to shake.
I have a name, you know.

Bren R.

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#213082 - 06/26/08 01:11 AM Re: Dual Rotary Subs Used at Trinity Church [Re: BrenR]
fredk Offline
axiomite

Registered: 12/06/07
Posts: 7139
Loc: Canada
But I didn't want to embarass you. Now that you're out of the closet though...
_________________________
Fred

-------
Blujays1: Spending Fred's money one bottle at a time, no two... Oh crap!

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#213094 - 06/26/08 02:58 AM Re: Dual Rotary Subs Used at Trinity Church [Re: fredk]
BrenR Offline
connoisseur

Registered: 12/10/03
Posts: 3602
Loc: Winnipeg MB Canada
Just do a search for "Junk Jiggling Bass" - I was "outted" long ago.

The thumpy bits are usually an indicator of power, while the sizzly bits are usually an indicator of build quality and they give you signal separation.

Stradivarius doesn't command a premium because they design really LOUD violins, but because of their tone. That's how *I* look at it.

Self-proclaimed treble-head,
Bren R.

(treble being upper register, not triple, Medic8r!)

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#213096 - 06/26/08 04:18 AM Re: Dual Rotary Subs Used at Trinity Church [Re: BrenR]
fredk Offline
axiomite

Registered: 12/06/07
Posts: 7139
Loc: Canada
Hey, I saw that episode; "The trouble with Trebble-Heads"
_________________________
Fred

-------
Blujays1: Spending Fred's money one bottle at a time, no two... Oh crap!

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#213194 - 06/26/08 05:37 PM Re: Dual Rotary Subs Used at Trinity Church [Re: fredk]
BrenR Offline
connoisseur

Registered: 12/10/03
Posts: 3602
Loc: Winnipeg MB Canada
 Originally Posted By: fredk
Hey, I saw that episode; "The trouble with Trebble-Heads"
I'm furrier though... speaking of which, my next 5 gallon pail of Nair should be here any time now.

Bren R.

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#213235 - 06/26/08 11:29 PM Re: Dual Rotary Subs Used at Trinity Church [Re: BrenR]
CV Offline
Founder, Axiom Upgrade Club
shareholder in the making

Registered: 07/20/06
Posts: 11236
Loc: Richland, WA, USA
If you dare wear short shorts.

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#213266 - 06/27/08 12:11 PM Re: Dual Rotary Subs Used at Trinity Church [Re: BrenR]
pmbuko Offline
shareholder in the making

Registered: 04/02/03
Posts: 16289
Loc: Leesburg, Virginia
 Quote:
I'm furrier though

You'd not this furry, though, are you?
_________________________
"I wish I had documented more…" said nobody on their death bed, ever.

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#213269 - 06/27/08 12:16 PM Re: Dual Rotary Subs Used at Trinity Church [Re: pmbuko]
Ken.C Online   content
shareholder in the making

Registered: 05/03/03
Posts: 17789
Loc: NoVA
I would pay good money not to have clicked that link.
_________________________
I am the Doctor, and THIS... is my SPOON!

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#213292 - 06/27/08 02:03 PM Re: Dual Rotary Subs Used at Trinity Church [Re: Ken.C]
Capn_Pickard Offline
connoisseur

Registered: 03/09/04
Posts: 1056
Loc: Arlington, VA (NOVA)
that's some of the weirdest sh*t I've seen in a long time. And just think, without the wonderful world wide web, these fetishistic wierdos would have to stroke their fur at home all alone.

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#213298 - 06/27/08 02:31 PM Re: Dual Rotary Subs Used at Trinity Church [Re: Capn_Pickard]
medic8r Offline
axiomite

Registered: 02/05/06
Posts: 6402
Loc: Fredericksburg, Virginia
Ah, yes, the furries and plushies.

Didn't the Midfest FurFest happen at the same hotel that Negative Orange trashed so bad during their very first tour?
_________________________
"The Universe is the game of the self, which plays hide and seek forever and ever" - Alan Watts

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#213331 - 06/27/08 03:49 PM Re: Dual Rotary Subs Used at Trinity Church [Re: medic8r]
pmbuko Offline
shareholder in the making

Registered: 04/02/03
Posts: 16289
Loc: Leesburg, Virginia
I don't know, but I bet CV has the mohair prophylactic to prove it.
_________________________
"I wish I had documented more…" said nobody on their death bed, ever.

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#213332 - 06/27/08 03:50 PM Re: Dual Rotary Subs Used at Trinity Church [Re: pmbuko]
medic8r Offline
axiomite

Registered: 02/05/06
Posts: 6402
Loc: Fredericksburg, Virginia
You ba$tard, now I've got to explain to my staff why I was guffawing. I'm getting looks of bewilderment...
_________________________
"The Universe is the game of the self, which plays hide and seek forever and ever" - Alan Watts

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#213335 - 06/27/08 03:53 PM Re: Dual Rotary Subs Used at Trinity Church [Re: medic8r]
pmbuko Offline
shareholder in the making

Registered: 04/02/03
Posts: 16289
Loc: Leesburg, Virginia
I just put all the other NegOr replies to shame.
_________________________
"I wish I had documented more…" said nobody on their death bed, ever.

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