Quick OverviewThe Dayton Audio SPA100-D high-efficiency subwoofer plate amp packs big-amp features into a compact chassis that is ideal for installation into cabinets that can't accommodate bulky old-style amps.Product Highlights100W RMS Output @ 4 ohmsSwitchable 6 dB @ 30 Hz bass boostClass-D output stage for highly efficient, well defined outputManual and Auto on/off modes for compatibility with any automated systemVariable gain, crossover point and switchable phase controls optimize room integrationSwitchable 120/240V input voltage