HI GUYS,I GUESS LAST NIGHT I WAS SLEEPY.BUT HERE WE GO.THE 770 AND 755 REPRESENT A DEPARTURE FROM MANY OF THE OTHER CURRENTLY AVAILABLE AMPLIFIER DESIGNS.THIS DEPARTURE IS THE RESULT OF CAREFUL STUDY OF ALL KNOWN AMPLIFIER TECHNOLOGY,CIRCUITS AND PARTS.I CAN SEE FROM THEIR ILUSTRATIONS,THAT THEIR MAJOR FEATURES OF THE 770 AND 755 ARE THEIR OUTSTANDING ABILITY TO DRIVE VIRTUALLY ANY SPEAKER,REGARLESS OF IMPENDANCE.BY USING APROXIMATELLY TWO 700 WATT TRANSFORMERS ALONG WITH 120,000 MICROFARADS OF FILTER CAPACITANCE.IT IS A WELL DESIGN AMPLIFIER TOPOLOGY USE BY SOME OF THE BEST AMPLIFIER DESIGNERS,EXAMPLE KRELL,McIntosh,CLASEE,LEXICON,AND MANY MORE.HOPE TO HAVE ANSWER YOUR QUESTION. EUROROM