Axiom Home Page Forums General Discussion Home Theater cult of infinitely baffled

LOL! Hmmmmn... interesting thought process there, Zimm. What has worked for you in that way before? Sounds like the voice of experience!

I was wondering the same thing in my application. The shared attic extends over the master bedroom, where my wife goes to ESCAPE the HT rumbling sound! Not sayin' I mean to keep this idea in mind!

I must say this whole house subwoofer certainly does appeal to the Tool Time, Tim'the tool man' Taylor side of me. Aaaaarrhhhooo!

Tim says: "Subs in boxes, phhft! That is only the manufactures 'recommendation'! I can better that (before the wife gets home)!"

Now that is wild. I love to see real innovation. Talk about "outside the box".

Yea, the rotary woofer is pretty cool. If I won the lottery I think I would try one of these out just because.

Oh yeah, I forgot to check the price. That much for a fan!? That's probably why I never see much mention of them.

OK, this stack of subs in a tube in the attic which is only flat down to 10 Hz vs. the DC of the rotary woofer is acceptable.

I'll still be looking for a system which can reproduce frequencies from DC to daylight.

It's not just a fan. The fan is a single speed fan. There's also an intricate (patent pending) control system to adjust the vanes on the fan in a precise manner to control the output frequency. It's a very interesting read.

Yeah, I know. I was just over-reacting to the price. When I saw how it worked, I thought to myself, "just like the blade pitch on a helicopter." Then when reading up on it a bit more, I found the idea was born from playing with a radio controlled chopper.

I don't find the control system that intricate (being familiar with the helicopter hub); the linear movement which modulates the pitch of the blades is actually a voice coil. I'd be more apt to describe the design as, "brilliantly inspired".

Thinking back to the attic stack. That's flat down to 10 Hz in room. The EP800 is flat down to 12 Hz in room. While 2 Hz at this end of the spectrum is a good sized piece of an octave, it's not that huge. So the EP800 is even more impressive to me now. But could still be backed up nicely by something which can easily reach 2 octaves lower...down to 6 Hz, and then down to 3.

Here's another article with pricing as well.

What do you think? Another 5 years before a commercial sub in the $2k range can have linear output down to that?

I don't doubt it can be done for around $2k, but it won't be with a traditional woofer design. Cones have greater and greater trouble coupling with the air they are trying to move as the wavelength of the tone they are attempting to reproduce exceeds their diameter*. Adding more cones doesn't help with this mismatch so much either. That just allows the little bit of interface between the air and cone to be multiplied, which is geometrical what is needed is exponential.

* A 12" woofer has an "impedance match" with the air when producing a 1kHz tone.**

** Of course getting a 12" woofer to cycle 1000 times in a second is another matter.