i use an all original eico st40 on stacked quads 3 pair iv tryed many combinations of amps includeing 3 fisher ba-6000 studio series amps that sounded pretty good but the high's seemed to be under a vail at one point I had 6 magnavox 6v6push pull parallel mono's that sounded like hell since all of them needed to be serviced HAHA. the phase linear model 300 worked very well with them, also had 3 nikko alpha 440's all kinds of junk I guess but I always go back to the eico something about 7591's and quads
