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Pioneer GM-DX871 Class-D Mono Car Subwoofer Amplifier Pioneer GM-DX871 new extra-efficient Class-D digital amplifiers mark a dramatic improvement in power output capability yet are 50% smaller than the current GM-Series Class-AB amplifiers. That makes them more versatile in terms of installation as well as performance. Pioneer GM-DX871 mono subwoofer amplifier can deliver up to 800 watts RMS to your subwoofer for powerful bass that’ll give every song a strong and heavy beat. Highly efficient Class D technology keeps this powerful amp running as cool as it looks and allows for a small chassis that fits in a lot of out-of-the-way spaces. Improved Circuit Design To prevent circuit shutdown Pioneer’s new digital amplifier circuit “Protection Control Systemsenses its internal temperature and automatically moderates input level accordingly. Stable durable circuitry lessens the risk of high input power for the unit to achieve 1 connection. This design enhances the flexibility to connect multiple subwoofers to a system. Variable-Low Pass Filter For extra flexibility variable LPF make audio frequency more adjustable according to subwoofer characteristics and personal listening preferences. The GM-DX871 LPF is adjustable from 40 Hz to 240 Hz. Turn Up the Bass Every new Pioneer Class-D amplifier has a wired bass boost remote control for optimal bass level adjustment according to listening preferences and music characteristics.