Quote Originally Posted by transparent
My Yamaha RX-V2400 quits when I use the automatic Yamaha-Parametric-
Acoustic-Optimizer (YPAO) to setup the speakers. The problem occurs during a frequency sweep, and other speakers do not cause the problem, only the Martin Logan Odysseys.

It is true, that the RX-V2400 is spec'd for a minimum of 6 ohms ouput impedance, and the Odysseys are spec'd for a nominal 4 ohms at lower frequencies, but drops to 1 ohm at 20KHz. It appears that the Yamaha detects the lower impedance at higher freq's and just trips the switch. Yamaha service people reaffirmed that the Rcvr won't drive the 1 ohm, and Martin Logan say "not my problem, the impedance spec is clearly stated".

Is there a service menu for the Yamaha that would let me defeat the overcurrent cutoff, or must I use an external amp? Any other solutions?
transparent,
I just resolved my issue. The culprit is indeed your Yamaha. Yamaha is design to powered 6 ohm and 8 ohm speaker. The distortion from running 4 ohm speaker is 10 times greater then running speaker design for 6 ohm/8ohm. Also, the way Yamaha/Japanese manufacture(Expert's advise from serveral Hi-end audio store) calculate their RMS is complete different from Hi-End audio componet maker. Their RMS is less then half as powerful. I got my system to turn the entire 180 degree after I took the lost on my brand new Yamaha and bought a NAD C352. Now I can enjoy my music the way both Speaker and the amplifier is designed.