Hi Gene! I recently bought the AVR-X3400H after reading this review and also the detailed review of the AVR-X3300W. I am using the preamp outputs with my Emotiva XPA-5. I'm looking for your opinion on utilizing the typically-avoided ECO mode with an external amp, as in my setup. I spoke with Denon and their technical support assured me that the preamp output voltage is NOT impacted by ECO mode. Have you experienced anything contradictory or have any other thoughts? Thanks very much!