Ken.C. is right.
I use an Onkyo Integra M-504 to drive a pair of Thiel CS 3.6 towers. They are 4 ohm rated speakers and reportedly a difficult load to drive. The Big ONK has no problem whatsoever driving the Thiels to high volumes with no discernable distortion and no problems, all day long.
There were many 4 ohm speakers available in the 80's, including Dahlquists, and KEFs - I'm sure there were more, but those are 2 that come right to mind.
Something is wrong with your speakers, cabling, or your M504.
I just pulled out the manual for the M-504. They are rated at 165 wpc at 8 ohms at 1KHz, 0.003% distortion. They do not give an output rating at 4 ohms.
Worse, the manual indicates that the fault protection circuit may initiate when excessive current appears at the terminals as when speakers of lower impedence are being used.
Looks like I am lucky with mine and the Thiels.
I also have a bunch of old Yamaha M80 amps. They are rated stable to 2 ohms.
Edited by 2x6spds (04/29/11 07:23 PM)
Enjoy the Music. Trust your ears. Laugh at Folks Who Claim to Know it All.