Hi, I OWN ACOUSTAT 2+2 FOR THREE YEARS NOW.TRIED MANY AMPS-EAR 509 MONOBLOCK TUBES:TOO BRIGHT,MCORMACK 100W SPECIAL EDITION AND HAFLER D220 100WATT:SOUNDED IDENTICAL(FLAT AND DEAD). DENON 6600 250WATTS MONOBLOCKS,LITTLE MORE PUNCH THAN PREVIOUS 2 AMPS BUT STILL DEAD.RESTECK CHALLENGER(GERMAN INTEGRATED 130WATTS -WONDERFUL SOUND BUT THEY SWITCHED OFF FREQUENTLY BECAUSE THEY COULD NOT STAND THE LOAD.ROTEL 100W INTEGRATED,CLIPPED AND NO SPECIAL SOUND.FINALLY GOT 2 CUSTOM BUILT 60WATT TRIODE SINGLE ENDED MONOBLOCKS.SOUND IS SPECTACULAR. THEY WERE MATCHED ON THE FEEDBACK RESISTOR(20 db FEEDBACK) TO THE LOUDSPEAKERS.I AM PLAYING AT AN AVERAGE OF 95 DB AND HAVE REACH AUDIO NIRVANA(FOR THE TIME BEING). I STRONGLY RECCOMEND TUBE AMPLIFICATION.IT IS IMPERATIVE TO LISTEN IN YOUR HOME BEFORE YOU BUY.YOU WON'T BE DISAPPOINTED.
