The HeadAmp KGSS is very nice and clean with great control of the SR009s (never got to hear mine with my SR-007Mk1s as I got them after I sold of the KGSS). The KGSSHV (mine is the 450V 1968SA version with the current increased to 9mA), the bass is better controlled and the imaging is a bit wider. The KGSSHV is the natural progression of the KGSS with improvements across the board. Now both are extremely clean sounding with great detail, just that the HV version does things a bit better across the board.
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