ATC transducers in dipole loudspeakers?

Llana · 19th October 2007, 01:07 AM

Hello, I'm Jorge.
Anybody utilize ATC SM75-150 drive units in dipole loudspeakers project?. If somebody use these transducers I'd like to know the quantity and the arrangement in each baffle.
For example:

- One transducer per baffle.
- Two transducers per baffle in symmetrically arrangement.
- Four transducers per baffle in quad array, like the midranges in the Helix loudspeakers of Legacy Audio, ( yes, I know that Legacy don't use ATC).

I imagine that the use of four SM75-150 per loudspeaker sound like a madness.

wigginjs · 19th October 2007, 02:09 AM

Quote:

Originally posted by Llana
I imagine that the use of four SM75-150 per loudspeaker sound like a madness.

Only to the weak.

ShinOBIWAN · 19th October 2007, 02:57 AM

The ATC SM75-150 and its bigger brother SM75-150S are both closed back designs much as you'd find with a dome tweeter. You won't get any dipole happenings with those unless you duplicated the quad ATC array on the rear of the baffle.

The mid drivers alone will set you back over $12k.

Now where did I put that spare kidney...

el`Ol · 19th October 2007, 03:13 AM

Why shouldn`t one love the boxless bass of an OB without the hyper-airy dipole sound?
I am asking myself whether the ATC could be integrated in MJK`s concept.
http://www.quarter-wave.com/General/OB_Design.pdf
The highpass cutoff is 400Hz, good for the ATC, but would 12dB be steep enough?
But someone who can afford 8 ATCs will probably go DEQX anyway.

19th October 2007, 01:07 AM	#1
Llana diyAudio Member Join Date: Sep 2007	ATC transducers in dipole loudspeakers? Hello, I'm Jorge. Anybody utilize ATC SM75-150 drive units in dipole loudspeakers project?. If somebody use these transducers I'd like to know the quantity and the arrangement in each baffle. For example: - One transducer per baffle. - Two transducers per baffle in symmetrically arrangement. - Four transducers per baffle in quad array, like the midranges in the Helix loudspeakers of Legacy Audio, ( yes, I know that Legacy don't use ATC). I imagine that the use of four SM75-150 per loudspeaker sound like a madness.

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19th October 2007, 02:57 AM	#3
ShinOBIWAN diyAudio Member Join Date: Feb 2004 Location: UK	The ATC SM75-150 and its bigger brother SM75-150S are both closed back designs much as you'd find with a dome tweeter. You won't get any dipole happenings with those unless you duplicated the quad ATC array on the rear of the baffle. The mid drivers alone will set you back over $12k. Now where did I put that spare kidney...

19th October 2007, 03:13 AM	#4
el`Ol diyAudio Member Join Date: May 2005 Location: Bavarian Forest	Why shouldn`t one love the boxless bass of an OB without the hyper-airy dipole sound? I am asking myself whether the ATC could be integrated in MJK`s concept. http://www.quarter-wave.com/General/OB_Design.pdf The highpass cutoff is 400Hz, good for the ATC, but would 12dB be steep enough? But someone who can afford 8 ATCs will probably go DEQX anyway.

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