Cadence QRS Series 4 Channel Class G/H Full Range Amplifier QRS4.125GH Specifications Channel/Class: 4 G/H RMS Power@1 ohm-14.4V: RMS Power@2 ohm-14.4V: 200Wx4 RMS Power@4ohm-14.4V: 125W x4 BridgeRMS Power@4 ohm-14.4V: 400W x 2 Minimum THD: 0.05% S/N Ratio: >86 dB Fuse Rating: 35A x 3 Dimensions (Lx W x H): 17.32″x7.56″x2.32″