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This tiny amplifier packs a serious full-range punch, delivering a staggering 100 watts to each of its four channels into 2 ohms (14.4V, 1% THD). The breakthrough that makes this much power possible in such a small chassis is JL Audio's NexD™ ultra-high-speed switching design, which allows for full bandwidth Class D operation with extremely low distortion and outstanding efficiency..
Use the XD400/4v2 in combination with their XD600/1 monoblock to build a 1000 W amplification system to power four satellites and a subwoofer... and fit the whole thing under a seat. Or, use the XD400/4v2 by itself to power two satellites, plus a subwoofer. With XD's, the possibilities are endless.
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The XD400/4v2 includes a 12 dB / octave filter for each channel bank, which can be configured as a low-pass or high-pass filter and offers continuously variable cutoff frequency selection from 50-500 Hz. This amplifier features a black powder-coat finish and a gasketed, brushed aluminum cover for the controls.
The XD400/4v2 also features the set, which consists of automatic turn-on capabilitv2 Spec featurey (via signal sensing or DC-offset sensing), and a dual-range differential-balanced input section able to handle a wide range of input voltage levels. With the addition of an HD-RLC remote level control (sold separately), the amplifier's level can be directly controlled from the driver's seat.

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would recommend buying from this website to everyone who needs new audio or an upgrade
Brought this amp for my boyfriend for his birthday after his Pioneer amp stopped working. He is very happy with this amp. I like the black and silver design too. You guys shipped it fast too! 2 thumbs up!