Rotary Woofer voice coil

AES Exhibition Oct 2008: see the rotary woofer voice coil and fan gears in action. Starts about midway in the video.

Category:

Science & Technology

Tags:

• rotary
• woofer
• sub
• subwoofer
• speaker
• sound
• pressure
• SPL
• infrasonic
• VLF
• largest
• subsonic
• lowest
• very
• low
• frequency

[IgorSavtchenko]

This is great. The wikipedia article is pretty thorough on the basic concept of this. So, I take it that this whole set up is not portable? So, that room/chamber thing will have to be built and collapsed each time?

[tzotzo]

@IgorSavtchenko the TRW is meant for a fixed installation with carefully designed baffles. chamber, back pressure area, etc... however, the inventor recently told me that he is working on a portable TRW unit, for large venues such as concerts.

[hellatyteman13]

No, it acts sort of like a helicopter blade where it engages levers to change the pitch of the blades. The "fan" spins at a constant speed and with no signal, the blades are straight, and as the bass comes on and a signal goes into the voice coil, it changes the pitch of the blade creating pressure inside the other room/box.

[tzotzo]

@hellatyteman13 yes, finally somebody gets it!

[dannon2010]

I've been searching for leslies and rotary speakers, but I have no idea whats going on here....spinning subwoofer?

[tzotzo]

@dannon2010 yes it is a subwoofer. High pressure low freq sound waves are produced by the blade (which spins at a constant speed, around 700Hz if I recall) which changes pitch linearly according to the voltage waveform from the amp output. As simple as that. So the pitch can be positive, zero, and negative. There is a max amplitude pitch of course which should not be approached otherwise distortion increases.

[Bassotronics]

Instead of "Bass, I Love You", it would be called "Rotory, I destroyed You". LOL

[hotxxxx]

put ur figner in it

[bait28]

@EmpireLS56KW how is it noisy. i've used one before. and they are not noisy. and once you watch a movie, you can't hear it, and it rattles the shit out of any thing. you need to shut up.

[EmpireLS56KW]

What a load of rubbish! Damn thing is so noisy! No way would I have that, not if you paid me £10billion! FAIL!

[TheJoshinator1]

@Jetcan1122 Ummm, it's supposed to be. It's built into his wall so it will stay in one spot while producing bass tones.

[Jetcan1122]

Look how getto that is its in his wall

[spaghettiwesternLUVA]

@hellatyteman13 perfect summary thank you

how do ships go in reverse?

haahah

[goingfishing313]

So basicly this thing works like a 3d r/c helicopter right? Pitch of the blades changes to create the bass?

[vr4ish]

But will it blend?

[toyghgh]

Is it wrong that subwoofer technology gives me a woody. I can actually appreciate the forces being generated by this air moving machine. SCARY if ya think about it too much lol

[paintballgundown8]

will it blend?

yes

Only this will be the thing doing the blending.

[OrganNLou]

@theantiredneck You have to hear it in person!