The Phoenix Gold R-Series amplifiers are available in five variations; three mono and two four-channel. All R-Series amps feature a robust, unregulated power supply; over-sized direct input power and speaker terminals; audiophile complimentary bi-polar output transistors; an ultra-fast switching mosfet output stage;LPL44 and RMD ports, and audio precision quality control verification. MSRP ranges from $169.99 to $449.99.