Doesnt resistance mean same as impedance??

@jjss49 ;-) lovely..i will pass that story along as we chat weekly. I understand the “ speaker closet “, mine is full of Quad, A/D/S, , Etc… Then there are the out on loan.

IMO having run the 3a-sig w many amps in a few rooms over a decade, they require an amp w grip, drive and control due to the rear mounted acoustic coupler. Your amp is a perfect match :-) My brother a 40 year audiophile has my old pair, he uses a Threshold w ARC tube pre, SOTA table. The Threshold doesn’t care about the load, sounds sublime…. Nelson and Richard aint newbies…

Jim

as a bit of an aside, my mentor , teacher and friend Richard Vandersteen engineers his speakers to be a relatively easy load and provides matching. power amplifiers optimized for those loads. An unfair advantage some would say…..

@carlsbad nice post on the simplified explanation, i had pegged you as a follower , i am sorry if i misjudged you. 

Jim

From a speaker perspective the spec is a rather complex chart of impedence vs frequency including the phase angle component, often called load. There is no single amplifier spec of an amplifiers ability to “ deal “ with the complex load w real music, so we end up using square waves ( made by using sine waves of many frequencies ), a simulated speaker load and then looking at power output and distortion at various loads. For a SS amp the accepted benchmark is ability to double power in watts as impedence is cut in half. This is also imperfect. Great amp designers are measure and listen people.