Acoustat-X

The biggest problem with the Model 4 and the Monitor 4 (which you have) is that the 4 panel models sound better in a 2+2 configuration than in the 4 across configuration. Many Acoustat owners (including me) built our own frames, using hardwood and cross-bracing, to end up with a better 2+2 than Acoustat made. I think the 4 across models ended with the Monitor 4 because of this, but I am not sure.

I’m glad to hear that Ray is still around and involved with the products.
 
audionutz, Roy Esposito from Acoustat Service confirmed your determination that they are in fact a pair of The Monitors and were the next version after the X model and before the 3 and 4. Doesn't get me any closer to knowing why they worked properly when I purchased them but didn't when I set them up in my shop.

I am now trying to find the schematic for the MK121-2A interface. Hopefully someone has one and can send me a copy.
Someone is a little confused here. The Models 3 and 4 came right after the X and were the last to use the S-C amps. The panels in those were raised about 10-12” but they did not have the pedestal base. The Monitor series switched to the transformers and used the pedestal base (which “died” after those models).

I'm not expert on the transformers (I never owned one), but shouldn't your speakers have the MK121 interface? Doesn't the MK121-2A belong with the Spectra series (which used slightly different panels)? I will reach out to a friend with 2+2's and see what transformer went with those.
 
Roy said they originally came with the tube servo amps.

He said that the interfaces that I have will work just fine with the speakers I have, which are The Monitor that came after the X.
 
So it turns out the speakers work great. I would love to hear them with tubes.

Another former employee of Accoustat on DIY Site verified that they have the "C" Mod and the interfaces have the changed
but not to Medallion transformers. The transformers will produce slightly less bass with this upgrade.

I think for $1000, someone will be getting a great deal. Now finding someone close enough to pick them up is the next step.
 

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