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400W RMS JX Series 4-Channel Class D Full-Range Amplifier
• Peak: 70W x 4 @ 4 ohm, 100W x 4 @ 2 ohm, 200W x 2 @ 4 ohm Bridged
• Unregulated PWM switching type power supply
• Class D Circuitry
• Defeatable 12 dB / octave filter
• Speaker-level (high-level) inputs with included harness
• Dimensions: 7.68"W x 9.05"L x 2.09"H
• Peak: 70W x 4 @ 4 ohm, 100W x 4 @ 2 ohm, 200W x 2 @ 4 ohm Bridged
• Unregulated PWM switching type power supply
• Class D Circuitry
• Defeatable 12 dB / octave filter
• Speaker-level (high-level) inputs with included harness
• Dimensions: 7.68"W x 9.05"L x 2.09"H

The JL Audio JX Series of amplifiers are designed with a specific purpose; to deliver clean, rock-solid performance and reliability at an affordable price. The JL Audio JX400/4D is a four-channel, full-range audio amplifier utilizing Class D technology that can be operated with a wide variety of source units and system configurations. Unlike gimmicky price-conscious amplifiers, JL Audio employs specified oversized output transistors and rugged MOSFET power supplies to unsure proper current, thermal capacity and better overall performance. In addition, the JX400/4D includes flexible signal processing capabilities with a fully variable 12 dB/octave crossover filter, pass-through preamp outputs and high-level inputs.
For those systems that do not offer a preamp level signal option, you can connect speaker level signals directly to the “Hi-Level Inputs” connector using the supplied connector and wire harness. Simply splice the appropriate left/right and positive/negative wires to the included harness and plug the harness into the “Hi-Level Inputs” connector on the amplifier. The JX monoblock will attenuate the high-level signal to make it compatible with its input stage. Alternatively, a traditional left/ right pair of RCA type jacks is used for preamp level (low-level) signals. This is the preferred connection method whenever available.
The JX class D full-range amplifier features a defeatable 12 dB / octave filter, which can be configured as a low-pass or high-pass filter and offers continuously variable cutoff frequency selection from 50-200 Hz. This feature is designed to attenuate frequencies above or below its filter frequency, so that the system’s speakers do not reproduce any audible and often harmful frequencies. 80 Hz is a good starting point for system tuning, but its also advisable to match the crossover point with that of your subwoofer's low-pass filter - this ensures that your system is properly distributing the frequencies to the appropriate medium.
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Manufacturer:
Model Number:
JX400/4D
Weight:
5.80lbs
Internal SKU:
jx4004d
Internal Product ID:
93399
Well worth the $$$
Bought this amplifier earlier this year, been using it for almost 6 months now, and so far its been an excellent amp, couldn't complain. Sound clarity and staging is amazing, especially at the high end. Bass is good too. It has a strong solid sound, slightly to the warm end.
Heavy amp compared to others I've owned. Its rated @ 70watts X 4, but it feels more like 50watts. I've had an RF amp @ 50watts X 4 that put out more power then this one. Well worth the money, but you could do with equally good (or better) amps at a lower price.
59 found this helpful
JX360
The JX360/4 is a good amp in price and looks great in its design i feel the power rating is off tho it should not be a 360/4 if it can't handle the set up that a 300/4 can the JX360/4 is cheaper but weaker than the slash 300/4v2 (i have 2 now was trying to replace them bc I've had the hooked up 1 at a time on my system with no problem had just i had one four four years but got it fix after i sent the JX360/4 back) . All and all the JX360/4 is still good amp with good design just wish JL wouldnt have made them seem better than they are
59 found this helpful
Great
Very good amp for the money!! Sound is crystal clear! Made my system sound a lot better and I'm only running the front channels at 35 watts and the rear channels at 60 watts. Definitely worth the money if your not wanting/needing to go huge!
58 found this helpful
Good Amp
I have this amp hooked up to a Hertz Hi Energy component set in the front (120 watts rms each woofer+tweeter), and JL Audio C2 6 inch coaxials in the back (60 watts rms each speaker). The sound quality: is good... a lot cleaner than lesser brand amps i have tried, but not amazing. The heat: this amp will get surprisingly and unusually VERY hot! The size: is very big, but I prefer for people to look at it and think it has more power. I don't feel it pushes the 180x2 watts when bridged it claims. My front speakers don't struggle with it.
OVERALL: I recommend this amp. I have had nothing go wrong with this amp at all. The power is a solid step up front a headunit. I would love to get a nice class d amp like a JL HD or an Alpine PDX but since this is less than half the price of those, I am satisfied with my purchase.
55 found this helpful
Good Quality Amp.
Excellent buy for the money. Easy hook up. Looks great. Sounds great.
53 found this helpful
Great
Really surprised at the amount of power coming out of this little amp. 2010 F150 4 door speakers. I have the JL audio 5x7 speakers, very nice and with this amp it has the best sound! it has very good controls for sound quiality and is light enough I could mount very easy. It is sitting in a very small area and never over heats or even gets hot! It is great. Much more affordable then the JL audio HD amps as well.
54 found this helpful
Great price
Product worked perfectly as described and install was easy. Well worth the money. Another great product from JL. Clean power.
51 found this helpful
This amp rocks!
I bridged the channels of the JL 360/4 into a pair of JL C5-650 speakers in the front doors of my pickup and they sound awesome. The bass is supplied by a JL JX 500/1 amp and a JL 10" truck box. I couldn't be happier.
51 found this helpful
Great product
Another great product from JL. Clean, Clear Power. Great amplifier for a good price. I would buy it again.
50 found this helpful
fantastic amp
i am very pleased with this amp . great value for the money, my car stereo has now come to life
48 found this helpful
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