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Old 15th May 2010, 01:45 AM   #21
djn is offline djn  United States
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"A non ferrous case would be better and a wooden case would be better again."

Either one of those would be just as easy. The frame poles are black so I figure I would make them out of aluminum and have them powder coated high gloss black.
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Old 15th May 2010, 04:35 AM   #22
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Quote:
Originally Posted by moray james View Post
A used set of Acoustat interfaces would drive your panels well and you can tap off the HT supply at what ever voltage that you need. Would be a lot cheaper than having transformers built from scratch. You could compare them to your buddy's and see how they stack up.
Hello Moray James,

Very interesting and cost effective idea.
Did Acoustat use the same HF transformer in all of their interfaces whether it was driving 2 panels like in the 1+1, or 6 panels like in the Spectra 6600? Actually, now that I think about it, I'm not sure if all 6 panels get driven on the 6600 or just the middle two. Do you know?

I was just thinking that the Acoustat interface would only work well if the capacitive load of the Sound Lab U-1PX isn't too much more than what it was designed for. Otherwise your HF extension would be limited.

The Sound Lab U-1PX have about 2000 in^2 radiating area each and all that area is driven full range. The area is similar to the Acoustat Spectra 6600. Assuming the d/s spacing is similar and the 6600 has all 6 of its panels driven from the HF transformer it should work just fine although it probably won't need all the LF equalization the Acoustat interface provides.
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Old 15th May 2010, 02:45 PM   #23
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In my searching, I found the Acoustat X ESL tube amplifier. Why is that so specifically designed for an ESL speaker?

I have been running horns for ever and my biggest amp is a GM70 SET that only puts out 12wpc. From everything I've read so far, I'll need a lot more power than that.
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Old 15th May 2010, 04:06 PM   #24
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The Acoustat X was a direct-drive system, there was no transformer between the amp and the panels.

Your 12W tube amp will do fine with music without a lot of bass, like chamber music, opera, or voice+guitar type of stuff. Play music with any appreciable bass content and there will be gross distortion in the bass notes.

I am in this exact situation right now (17WPC amp) and am building a heavier amp to get out of it

Kenneth
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Old 15th May 2010, 04:15 PM   #25
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I have many friends around here that have SS amps that would work. Son of Ampzilla, Accuphase, Adcom, Crown, S.A.E., .... just to name a few. I have been a horn and SET guy for years so this is a new adventure for me.
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Old 15th May 2010, 06:11 PM   #26
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The Sound Lab U-1PX have about 2000 in^2 radiating area each and all that area is driven full range. The area is similar to the Acoustat Spectra 6600. Assuming the d/s spacing is similar and the 6600 has all 6 of its panels driven from the HF transformer it should work just fine although it probably won't need all the LF equalization the Acoustat interface provides.[/QUOTE]


The Acoustat interfaces should work fine. All the panels in the 6600 are active. Base EQ on the Acoustat interfaces is adjustable.
I would go with a wooden case just as easy to build looks nice sounds better.
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Old 15th May 2010, 06:20 PM   #27
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Quote:
Originally Posted by moray james View Post
I would go with a wooden case just as easy to build looks nice sounds better.
Can you describe the sound differences between a wooden and a metal box please?
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Old 15th May 2010, 10:07 PM   #28
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Is there a site for Acoustat where I can find out more?
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Old 16th May 2010, 07:21 AM   #29
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There's got to be some info on The Audio Circuit.

Kenneth
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Old 16th May 2010, 04:43 PM   #30
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Default Wood Interface case

Here is an MDF case for a set of Acoustat interfaces. This is about as small as you would to make it. You can see that the transformers are all at right angles to each other to minimize magnetic coupling. The wooden case provides a cleaner more relaxed and open sound when compared to the metal case. Note the line filter feeding AC to the HT supply. This is a very good idea to help keep noise low.
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