Serial No: FS0035-AK0001149 Check OK Details 4CH power amplifier Rated output: 75W × 4 (4Ω) Maximum output: 100W x 4 (2Ω) / 200W x 2 (Bridged) 4Ω) Frequency characteristics: 10-35kHz (-3dB) Body only Although there are state scratches etc. Equipped with a HALOSONIC compatible mixing input, which is Harman's original active noise control system. Reduces external noise Have a better music experience 1 month warranty for peace of mind