Bridged amp with electrostatics..

Actually the 'bridge' issues is similar for transistor amps. With *any* bridged amp, both speaker terminals should be kept from ground.

BTW, ESLs in general are best driven by tubes. If you plan to do it with transistors, you will need a much larger amp due to the impedances and impedance curve of the speaker- Sound Labs are an excellent example of this: a 200 watt tube amp will play every bit as loud as a 400 watt transistor amp because the transistor amp will only make 200 watts into the load. In some cases, the 400 watts may only be 50! That's why tubes are the traditional choice for ESLs.

So are you looking for an amplifier that is based on a bridge circuit then?

Atma-Sphere, BAT, Einstein, Joule Electra are a few that come to mind.

You can run the speakers with the normal AC ground connection. The concern with most bridged amplifiers is that neither speaker terminal is at ground, so if you connect into a setup that does have one terminal grounded, a potential (pun intended :) exists for damage to the amplifier. The AC ground of your ESLs should have nothing to do with this. I've not heard of an ESL where the AC ground is the same as the '-' speaker terminal, but I suppose it could exist. Check with the manufacturer to be sure.

What ESLs are you using?

All the Best!

The nature of ESLs is such that they have an impedance curve that decreases as frequency increases, causing a transistor amp to make more power in the highs. So you do want to be careful!