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Geoff Poor of BAT just sent the following about the VK-655SE:
"The VK-655SE 'stereo' amp is, in fact, a true duo-mono design with two totally separate mono amps housed in a single chassis, each with their own separate power cord. The only element shared between the two amps, besides the single chassis, is the power switch.
"The mono-block version (which costs twice as much) is essentially a “stereo” amp with the two channels paralleled, which results in an amplifier with twice the current, half again lower output impedance and, theoretically, 6 dB better signal-to-noise ratio (relative to the one chassis, stereo amp). Thus, the two chassis mono-block version of the 655SE is simply a more powerful, better amplifier than the single chassis, duo-mono VK-655SE. Oh, and it does indeed sound better!"