JL Audio HX300/1: Monoblock Class D Full-Range Amplifier, 300 W Monoblock Class D Full Range Amplifier | RMS Power Rating @ 14.4 V: 4 ohms: 160 watts x 1 chan. | 3 ohms: 220 watts x 1 chan. | 2 ohms: 300 watts x 1 chan. | 1 ohms: ----------N/A----------- | RMS Power Rating @ 12.5 V: 4 ohms: 160 watts x 1 chan. | 3 ohms: 200 watts x 1 chan. | 2 ohms: 250 watts x 1 chan. | 1 ohms: ----------N/A----------- NexD ultra-high-speed switching design | Black powder-coated finish | Gasketed cover for the controls | Stainless steel hardware for durability IPX6 water-resistance rating | M-RBC-1 remote level control (sold separately) | Controls bass levels only | LED power (green) and protect (red) indicators Accepts RCA (low-level) & Speaker-level (high-level) signal | Switchable Input sensitivity: 250 mV-4 V (Low) to 750 mV-15 V (High) | Variable Bass Boost: 0 to +12 dB bass boost at 43Hz | Variable low-pass filter: 40 - 400 Hz, 24 dB/octave Frequency Response: 20 - 12,000 Hz | Total Harmonic Distortion (THD): &lt;1.0% | Signal to Noise Ration: 85 dB | Subsonic filter: 20 - 40 Hz | Selectable phase: 0 / 180 | Fuse Rating: 30A x 1 | Dimensions: 8.66"W x 3.09"D x 1.77"H