Infinity Reference 475a 4-CH Car Amplifier
The Infinity Reference 475a represents somewhat of an oddity in this day and age, thanks to its Class-AB architecture. It's plenty powerful for the money - 75 watts RMS per channel at 4 ohms (90 watts RMS per channel at 2 ohms) is nothing to be scoffed at. It can also be bridged to 2-channel mode, putting out 180 watts RMS at 4 ohms. Because this is a Class-AB amplifier, heat generation becomes a concern. Infinity has gone to great lengths to ensure that the Reference 475a remains reliable and will not shut down during hard use, though this is reflected in the added bulk of the chassis. Variable frequency filters and adjustable bass boost (up to 6dB) allow you to tailor the sound, while direct connect terminals and preamp outputs make setup simple.