Home Audio Subwoofers

**09-19-06, 09:12 AM**

Gentlemen, check out THIS http://blog.stereophile.com/cedia2006/091606thigpen/

and

THIS http://blog.stereophile.com/cedia2006/091906soundfield/

RG

**Sonnie** · **09-19-06, 09:43 AM**

Yes... the sub fan has been the subject of discussion in couple of threads. The price was a little scary... :raped:

Good to see ya out and about Robert.

**Jack Gilvey** · **09-19-06, 10:43 AM**

You're so vane...

**09-20-06, 07:33 PM**

Any measurments on this thing...I heard it went down to 5 hz, How does it work???

**Josuah** · **09-21-06, 12:43 AM**

I'm not 100% sure, but this is my understanding of it.

The fan blades spin (seem to be flat blades, so I'm not sure it pushes air one direction or the other, probably not or else it sitting between the two enclosed areas wouldn't work right???) and at the same time they vibrate at the frequency you are trying to reproduce. Therefore, the air being moved by the blades have the frequency.

I imagine it's a lot like when you talk into a standard fan.

**azjimmy** · **09-21-06, 02:32 AM**

It works on the same theory as a helicopter rotor. It compresses air just like a speaker, only it uses variable pitch blades to push air instead of a moving cone.
Pretty neat, really.
The video on the site is down right scary when they do the sweep. Looks like it's going to shuck a blade! You can even hear one of the guys saying not to get too close. Check it out http://www.youtube.com/watch?v=E7Bkrypxzs4
Jim

**09-21-06, 10:00 PM**

Quote:

Jack Gilvey wrote:

You're so vane...

You probably think this song is about you, Dont you, Don't you

**Chrisbee** · **09-22-06, 05:22 AM**

There are three videos on the TRW fan sub.

It would seem to offer not so much a signal to noise ratio as a noise to signal ratio!

When I think of the lengths I went to to just to quieten the fan in my EP2500...!

**Exocer** · **09-22-06, 01:09 PM**

Whenever people mention these fan subs I always wonder how musical content would sound. Something about musical bass notes comming from fan blades is incredibly interesting to me.

**JimPeitersen** · **09-26-06, 12:57 AM**

Quote:

Exocer wrote:

Whenever people mention these fan subs I always wonder how musical content would sound. Something about musical bass notes comming from fan blades is incredibly interesting to me.

I see two issues:

Can the human ear distinguish between notes (fundamentals and harmonics) in the extreme infrasonics that this "driver" produces?

In the end, does it really matter what the transducer is since all speakers are simply mechanical interfaces between the electronic signal and our ears (they all excite the air, does it matter how?)

JP

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