Two questions to Mac connoisseurs. How one can tell latest Mark VI from Mark V? Beside green lights under tubes. Any markings on amp itself? Is there any substantive difference in the way they sound?
If it were me I would make sure I audition the MC275s in my system before swapping out the Pass amplifier. You don't need as much power for the bass since its powered and the higher frequency is where the MLs will need serious power.
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