Hi Scvan, That' was a very helpful personal input. I see the Studios are reviewed by Stereophile at 6 nominal, 3 ohms minimum, and the Genesis 300's (very interesting design) at 4 ohms from their homepage. The LX-7 may be a perfect fit to drive two 3-channel powered monitors reaching 2.7 ohm loads. It appears to be very reliable. The balanced LX-7 would more than double the output support of the unbalanced factory amps. It would be located on a corner rack behind a large screen TV, so, the fans are not a significant issue.
There are two different types of factory amps in each cabinet. The larger amp powers the front 15, an 8, and 2 tweeters. Two matching smaller amps each powers one 8" midrange and two tweeters. The Alan Parson's Sound Check CD arrived yesterday (found it pre-owned last week on Amazon) and I ran a set of test tones. The in-room test of my system demonstrated several minor areas of the playback variability - yet, not as much as I suspected.
After running the Sound Check test sequence, I re-set the processor's volume and distance levels for all speakers. Something may have happened to the processor's previous set-up balance during a power surge or something. Now and several CD's later, a proprietary Proceed L/R surround mode with all speakers set to full-range sounds better than ever - a near MoJo perfection. In 2-channel, I could improve the main cabinets a bit, especially the midrange's under-amped sound at higher room volumes (85 or so C-weighted dB's). My only concern is using the Rane DEQ60 24-bit DAC's for the front main's, while the surrounds use the Proceed DAC's. The LX-7 is a very worthy candidate. Thank you for sharing your personal experiences of operating the LX-7 with your specific speakers and the very favorable results. That's just what I was hoping to hear.