TSD-PA252GTwo Channel Power Amplifier 25W x 2 @ 4 by Atlas Sound is a dependable , cost saving 4 stereo amplifier well suited for higher power amplification requirements. Output is 25W per channel at 4 or 50W bridge mono at 8 . Input is via balanced stereo phoenix style and unbalanced RCA connectors. Front panel gain controls provide adjustment for both left/right or bridged outputs and include removable knobs.