(Model GM-D8604). Specifications: 4-channel amplifier (Class D) with power up to 1000 watts. Excellent for running speakers or subwoofers with high quality. Second amplifier (silver): Type: Ample Audio (old classic model like A414X). Specifications: 4-channel aluminum amplifier for cooling. Speakers (Subwoofers): Type: Pair (2 pieces) Pioneer Champion Series 12-inch subwoofers in a custom box. Specifications: Gives very strong bass.