Nakamichi NDS4631A is a DSP with build in amplifier with up to 4 channels providing up to 50W of power, and 31 band parametric EQ allowing you to tune each channel to your preference.Dynamic Range(RCA Input): ≥100dBS/N (RCA Input): ≥90dBDistortion(THD): ≤0.05%Frequency Response: 20Hz~20KHzInput Impedance: High level input:240Ω ;Low level input:20kΩLow Level Output: 100ΩN-Power: 4×25W(±1W 10%THD)Output Power:4×50WSignal Input & Output Range:RCA Input:5.5Vpp;High Level:26Vpp;RCA Output:5.5VppPower: DC9V~16VREM Input: High Level Input Signal: FL+/FL- or ACC control cableREM Output: +12V Startup Voltage OutputStandby Power: ≤0.1WNet Weight: Approx. 1.2KgProduct Dimension(L×W×H): 176×141.2×40mm