250W subwoofer plate amplifier

The Dayton Audio SPA250 subwoofer amplifier produces 250 watts of clean power output, and combines with a host of flexible user options to make it an unbeatable choice. A user-configurable bass boost circuit creates a 6 dB peak at 35 Hz, which allows sealed subwoofer designs and certain ported enclosures to achieve their optimum bass extension and maximum "flat" output. 
It features RCA line level and banana jack speaker level inputs and outputs, automatic power-on that is triggered by any audio input signal, and a phase reverse switch to match the subwoofer to your room and your other speakers. A single amp can accept a stereo input signal and combine it into mono, which is preferred for sub bass reproduction. A preamp or receiver's LFE output may be connected to the SPA250's Left (mono) input. The internal low pass crossover is fully adjustable between 40 and 180 Hz, and of course the amp has built-in protection against internal and external faults.
 

• Switchable 6 dB @ 35 Hz bass boost
• Mono Class AB output stage for solid, well defined output
• Low-level and high-level inputs connect to any system
• Manual, auto, or triggered on/off modes for compatibility with any automated system
• Variable gain, crossover point and switchable phase controls optimize room integration
• Switchable 120/240V input voltage
• Energy efficient—draws less than 1 watt in stand-by mode