Power and style that amplifies The PA660.4 is a four-channel class A/B amplifier with built-in fully variable low-pass crossover. Equipped with remote gain, the PA660.4 is capable of two-channel operation with a maximum power of 600 Watts when both the front and rear bridged channels are driven into 4 ohms speaker loads. PA660.4 Features: 75 Watts x 4 continuous, 85 x 4 dynamic power (2 ohm load), 4 channel mode. 150 Watts x 2 (4 ohm) continuous power, 2 channel mode. CEA-2006 compliant specifications for true, accurate power ratings. 4-channel, dual bridge-mono (2-channel), or dual simultaneous stereo/mono operation provide a variety of configurations and setups: 4-channel for front and rear speakers; 2 speakers and a sub; 2 subwoofers 2 ohm stable 4-channel operation. High-speed MOSFET switching power supply and high current bipolar output transistors pump maximum voltage and high current to your speakers or subwoofers. Double layer fiberglass epoxy printed circuit boards for more rigidity, less shrinkage and a smaller overall amp footprint. 6-way Smart System Protection (SSP) circuits Variable bass boost (0dB, +8dB) for extra bass thump. Variable input gain optimizes match with different signal sources (250mv to 8V). Mounting hardware with rubber isolation grommets and extra fuses included. Multi-color status LED gives instant information on amplifier operation. Color: chestnut brown, paintable. Durable, high performance fabric dome tweeters deliver clear and detailed high frequency response and excellent imaging. Capacitive Coupling Technology (CCT), an advanced signal-blocking technology that overcomes the usual limitations of small-enclosure loudspeakers (slim dynamics and no low frequency response), delivers extended dynamic range and enhancing deep bass response for clear, detailed musicality with little or no coloration. Glass-filled ABS enclosure is super-dense and acoustically inert, ensuring an extremely clean and low coloration midrange response. Paintable white finish blends into any decor. 5-way gold-plated binding posts, for the best connections, are easily accessible no matter how you mount your speakers.