Do you want to play with solid state on the woofers and tubes on the mid/highs;any interest in this method?
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I'm doing it right now w a pair of Ref 3A Supremas, but have just begun experimenting. I did a lot of searching and encountered some of the problems you noted. I eventually pulled on the trigger on the NHT active x-over driven from my tube pre-amp, w a Solid state 100 wpc amp driving the passive sub-woofers (also 2, 8" per side, iso-baric loading). This tawo box solution takes care of 50 hz down. VERY solid, non-boomy, stereo bass. The upper frequency box (actually a stand-alone Ref 3A Royal Master monitor which has an 8" nearly full range carbon fiber driver and a small fabric dome tweeter w a cap and resistor filter) is reflex loaded handling 40 hz and up. The high pass output from the active x-over feeds an EL-34 p-p amp and the monitor is bi-wired, since it has no real crossover. So far I am pretty happy w it. Another 2 box solution is the mono NHT subwoofer amp/x-over, one for each channel. The NHTs have lots of adjustability for x-over freq and phase, XLR and RCA ins and outs, gain, etc.