You now have Martin Logan ESL speakers driven by a 2-channel Devialet Expert 200 integrated amp. You want to know if you add a home theater receiver, such as a Denon AVR-X3700H while continuing to drive the ESL speakers with the Devialet. Is that correct?
Yes. I just looked at the
Denon AVR-X3700H manual. As far as I can tell, after a quick read, you can run the Denon as a pre-amp for the front left and right channels, while powering the ESL speakers with your Devialet amp. Connect the Denon's pre-outs for front left and right channels to the appropriate inputs on the Devialet. And, connect the ESL speakers to the Devialet amp, while connecting all other speakers to the appropriate speaker connections on the Denon.
This way, the Devialet amp powers the front left and right speakers, no matter what source you play, 2-channel music or multi-channel audio. The Denon 3700 powers the other channels.
Ignore Zone 2. It is meant for 2-channel playback in another room.
See pages 63 and 216-17 in the manual. I see how their choice of words is confusing. For example, page 63 says:
You can use this unit as a pre-amp by connecting an external power amplifier to the PRE OUT connectors. By adding a power amplifier to each channel, the realness of the sound can be further enhanced. Select the terminal to use and connect the device.
Instead of "each channel" I think they should say "as many channels as you choose, up to 7".