The RX amplifiers feature high quality doubled sided circuit board with SMT parts. Each part is computer tested before instantly inserted and soldered by machine onto the PCB. The result is the correct part secured in the correct place for the lifetime of the amplifier. These, quite frankly, provide the best bang for the buck available today. Built tough with a heavy duty heatsink, robust unregulated power supply, oversized direct input power and speaker terminals. They also sound sweet thanks to the audiophile bi-polar output transistors. Want to upgrade your stock system without changing the head unit? No problem, the high level input makes breathing new life into your stock system simple. RX250.1 amplifier will power your audio system to new levels everyday and all day without breaking the bank.