Technics SU-G700 and Acoustat Model 1 or 1+1 ?

[artm]

So, I just purchased a Technics SU-G700 integrated (the original, not MK2) and using it with their SB-C700 monitors excellent-ly!

I also have Acoustat Model 1 and 1+1.

Can anyone advise on using either of these with this amp? It's being class D has me concerned a bit. I don't need high SPL and I would obviously try it onlow volume at first. I just don;t want to give it too much and cause it to blow, so to speak.

The Model 1 is not full range, so perhaps it's a more usable combination?

 

[AcoustatAnswerMan]

Speaking only for myself, I would find 70 WPC insufficient for any of the Acoustat models. Even more so for the Models One or One + One. Since these models have limited surface area, they are rather inefficient and needs lots of watts to really bloom. I can't speak on the subject of Class D compatibility.

 

[artm]

Well, the Model 1 is rated at 70W into 4-ohms as a minimum. The Technics is 140W at that. I do not use Acoustat's subwoofer with it, but a powered sub at 100Hz or so, feeding only the highs to the Acoustat.

Also, I have used a CJ Premier 11A (tubes) which is 70W with great success on the Model 1, again with the crossover.

I will need to give it a try, just want some advice before doing so.

 

[kazap]

I will need to give it a try, just want some advice before doing so.

Some ESL users have used Class D amps and got good sound with no issues. Some early Class-D adopters had the amp blow in seconds on ESL.

Well designed Class D with good filters can handle most ESL high capacitance and rapidly falling inductance with high freq. If a Class D has poor US filtering it could be a concern. Doesnt your Class-D have very high US output? How well does the Acoustat trannie filter US?

"Some class D amplifier designs are incompatible with ESL's. If a switching amplifier is designed without enough high frequency feedback, and no special considerations are made in the amplifier for driving ESL's or in the speaker for being driven by switching amplifiers, then the panel capacitance forms a tank with the amplifier's output filter inductance. This will resonate when excited by high frequency signal content, normally at frequencies somewhat but not far above the audio range. It can cause various sorts of distortion, and even arcing of the panels or damage to the amplifier, at sound levels well below the usual limit."