Those quad specs seem odd. IThe one speced must have a very weak power supply. If so, the quad mode should work better. My Fisher had 35 wpc x 4 or 90 wpc x 2. My old Bryston 100 watt amp (3B) is 100 per in stereo and 400 in mono, i.e. two of these would be 100 x 4 or 400 x 2.
