How about using a Denon AVR5800 with Martin Logans

JC,
That's not true, before I bought my present 2/5 channel set up I had a Denon 2700, that drove 2 sequel's, a Logos, and 2 scripts in the rear. Never shut the receiver down once! wasn't real dynamic, but it worked.

I stand corrected. I still maintain though that logans dip to around 1.5 to 2 ohms at about 20khz. If you call Martin Logan and ask them if a receiver rated at 6 ohm minimum load will "properly" drive their speakers to their maximum potential I think they might better satisfy your quest for knowledge. I do know Denon doesn't recommend loads at below 4 ohms because I own a Denon and even went to the manual last night to verify. This is a quote from the manual.
"Speakers with an impedance of from 6 to 16 ohms can be connected for use as front and center speakers"
"The protector circuit may be activated if the set is played for long periods of time at high voulmes when speakers with an impedance lower than the specified impedance are connected".

I had an old Onkyo thx-919 and it also drove my logans, Sequel II's,Logos and Aerius as surrounds, as Statman stated, it worked It never shut down, but I did not realise how much better they could sound until I got my separates...

Onkyo receivers actually are rated to be able to drive 4 ohm loads. Onkyo has much more current capability adn able to drive lower impedance load than Denon. Even my Yamaha will and is rated to drive 4ohm loads.

Okay, I'll say it again, it works! I also was doubtful about what the manual said. Also, the newer Logans are much better when dipping down at the higher frequencies. A lot of people when referring to the "drop" are remembering the CLS's I never had a problem driving the ML's. You also have to remember that manual is written for the average Joe, who most likely does not know what impedance loads are. If I had not tried it myself, and followed only what the manual stated I would still be in doubt.

Vern