Does anyone know anything about IMAX speakers?

[Joseph]

In the book Electroacoustic Devices Microphone and Loudspeakers by Glen Ballou
About 80 pages are written by Jay Mitchel designer of the Imax enclosure
Lots of information about drivers and enclosures plus some math,loudspeaker performance
Systems and loudspeaker Testing and measurement.

Joseph

[Woofer]

Most excellent bit of info Joseph.

For those that can afford it, then they are available online via the 'bay, or Amazon.
For those that can't, try your local library. They may have a copy.

Cheers lots to all…..

UPDATE: here's a link to an online pdf d/l:

http://www.google.com/url?sa=t&rct=j...,d.dGI&cad=rjt

[TW14MB]

Hello, I was at a local IMAX and thought the system sounded good, so I got some information from the local technical eng. I recently found this thread so thought I would share. He gave me a printout with this info, it does look like an overview sheet made by Sonics.

Much if this is known already, that the system is "Proportional Point Source" or "PPS" by Sonics.

3-way

x-over points
LF 80hz to 400hz Eminence 12" x4
MF 400hz to 7khz Eminence 8"
HF 7khz to 20khz Tad-2001

Text of interest:

"proprietary horns produce an asymmetric coverage pattern to closely contour with the seating arrangement of the theatre"
"The HF section uses a 1" compression driver produced by TAD (Pioneer)."
"The PPS loudspeakers operate in the frequency range of 70Hz-20kHz. All audio below 70Hz is delivered by the subbass."

I am a little confused by the last statement because of the xover at 80 mentioned in the other specs.

The sheet I have doesn't have OEM part numbers or detail on the subbass.

It was fun to talk to the eng. and learn more about the system.

I would also like to say THANKS to Jay Mitchell for making a great sounding system!!

[Woofer]

Thank you TW14MB for dropping in and adding your bit.
Every little bit helps to make this probably the most comprehensive informative thread on the subject of IMAX.

[rlsound]

I think the 70hz is a typo, everything previously found points to 80hz, as the point where the mains roll into the subwoofers.

[mortron]

I scored some Sonics 400x amps for a song... and found this thread. The IMAX xo board has been removed and am left with a molex connector that went to the xo module. I can identify the signal wires but wonder what is needed to get these running in balanced operation. Is Jay still participating on these boards? Perhaps someone else can help me. As I understand, they were sourced from Bryston so it'd be nice to get them running. Thanks.