If anyone is interested on Lyngdorf's feedback to my question. Here it is:
1. If I were to use the XLR analog output of the 3400 and then input the analog signal to a external amplifier, would I be loosing out on the capabilities of the 3400. I under stand I would lose out on the 3400 amplification but what about the ROOM PERFECT sound quality. Would I degrade the capabilities of ROOM PERFECT by using an external analog amp? I would turn off sub-woofer output on the 3400. I demoed the system this way (but without RP) and it sounded good. I am going back for a RP demo in a short while.
Answer: "you can set the outputs freely, RoomPerfect just needs a full stereo playback for its calibration "
I also asked them if a slim speaker worked best with RoomPerfect. I either read that somewhere or someone told me the urban audio legend.
Answer:; "we have never heard of any comments as to slim front profiles being better"
Sounds like I can buy the 3400 confident an external amp will also work with RoomPerfect.