I own 2 of these "sleeper" Reference quality pre-amps, with
the HCPS for both.
With the GCA-500, and GCA-250, the sound is something that
when matched properly with power cables and connects; these
products form a Musical Synergy rarely found at this price range.
Much more can be spent, but the question is, "will it sound better?" Rowland owners say this combo is as good if not better than their 2 box pre-amps.
Dollar for dollar, these are fantastic products, they let
the Music pass without being affected at All. The result is
a spacious sound-field,accurate low end, All of the qualities You hope for in a Reference Quality pre-amp.
Cabling is key to the Synergy.
Well worth the effort, once set up, listening for hours, is
so easily done.
The "air" and the clarity, is almost scary "clear".
Love Your Music