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JL AUDIO JD250/1
250 W Monoblock Class D Subwoofer Amplifier
GENERAL FEATURES:
Monoblock Class D Subwoofer Amplifier
250 W x 1 at 2 Ω / 150 W x 1 at 4 Ω - 14.4V
Designed to kick out a heavy 250 watts into 2 ohms (14.4V, 1% THD), this amplifier is a great solution for powering subwoofers in a cost-conscious system. Large amounts of real-world power output with excellent efficiency and ultra-low distortion result from the NexD™ switching technology.
The amp's controls are located on the input panel. The power and speaker connections are along the opposite end of its extruded aluminum chassis. Signal processing features include a 12 dB / octave low-pass filter, with continuously variable frequency selection from 50-500 Hz, and a variable bass boost EQ. Dual-range, differential-balanced inputs are also on-hand, capable of accepting line-level and speaker-level signals. Automatic turn-on capability (via signal sensing or DC-offset sensing) is standard, along with a set of preamp outputs so you can easily pass signals to another amplifier. 
The JD250/1 features an onboard LED-clipping indicator ring, surrounding the input sensitivity control. This useful feature lets you easily set your amplifier’s input sensitivity, without special equipment. With the addition of an RBC-1 remote level control (sold separately), you can control the subwoofer level from the driver’s seat.
Specifications
Frequency Response: 7 Hz - 500 Hz (+0, -1dB)
S/N Ratio, referred to highest rated power: >80 dB below rated power (A-weighted, 20 Hz - 20 kHz noise bandwidth)
S/N Ratio, referred to 1 W: >60 dB (A-weighted, 20 Hz - 20 kHz noise bandwidth)
Damping Factor at 4 Ω: >1000 / 50 Hz
Damping Factor at 2 Ω: >500 / 50 Hz
THD+N at Rated Power: <1% at 2 Ω per Ch.
Input Voltage Range at RCA Inputs: Switchable from 200 mV - 2 V RMS (Low) to 800 mV - 8 V RMS (High)
Min.Copper Power / Ground Wire Gauge: 8 AWG wire
Fuse Rating: 30 A (AFS, AGU or MaxiFuse™)
(RMS) Power at 14.4 V
at 4 Ω: 150 W RMS x 1
at 3 Ω: 200 W RMS x 1
at 2 Ω: 250 W RMS x 1