Product Information Pioneer PRS-D420 900 4 Channel Class FD Amp Maximum Output Power 4 x 150W (4& Omega;) or 2 x 600W (4& Omega;) Pioneer Reference Series Amp Gold Plated Screw Type Speaker Terminals Part of the Pioneer Reference Series, this full-range Class-D amplifier incorporates ICEpower digital design, which initiates considerable efficiency & less distortion compared to conventional Class-D amplifiers. The result is power & clarity combined. The PRS-D420 shares the same linear technology op-amp (operational amplifier) as our DEH-P88RS-II reference CD tuner, making a perfect pairing for high quality sound. Installation can be as flexibile as you require; the top plate rotates 180 degrees to suite your mounting direction. in addition, the speaker line input sensor automatically detects your speaker cables; meaning you can connect directly to the amplifier without a relay or other connections. With an anti-resonance H-shaped chassis,