Wow, you are too much SH !
I've since found my manual and apparently I should get around 850 Watts bridged into a 4ohm load. The GFA555II is stable into 1ohm if the manual is to be believed. This amp worked perfectly in stereo with each channel driving 4ohms, so any ideas as to why my output is so low. Amp has front mounted thermal and distortion alert bezels which in the past seldom ever flashed, and do not at all now.
With the 950's gain on max and the ICBM (placed between 950 & 755) also on max, I'm getting 75db 1 meter from the sub, using the 950's test tone and volume set at 00. My gains for the 5 speakers on the 755 are in the negatives to get 75db @ volume 00 at the central listening position.
Somethings askew yes?