Name: JL Audio RD400/4
Brand: JL Audio
SKU: rd4004
Price: 379.99 USD
Availability: InStock
Rating: 4.9643 (28 reviews)

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JL Audio RD400/4 Image 1 — JL Audio RD400/4

JL Audio RD400/4 Image 2 — JL Audio RD400/4

JL Audio RD400/4 Image 3 — JL Audio RD400/4

JL Audio RD400/4 Image 4 — JL Audio RD400/4

JL Audio RD400/4 Image 5 — JL Audio RD400/4

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Product highlights

• 75 watts x 4 channel @ 4 ohm
• 100 watts x 4 channel @ 2 ohm
• Bridged: 200 watts x 2 channel @ 4 ohm
• Total RMS Power: 400 watts
• Class D 2 ohm Stable 4-Channel Amplifier

Learn more about the rd4004

Universal – fits most vehicles.

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$379.99

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Brand new

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Open Box, Great $322.99

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Current Promotions (3 offers)

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Product Highlights

• 75 watts x 4 channel @ 4 ohm
• 100 watts x 4 channel @ 2 ohm
• Bridged: 200 watts x 2 channel @ 4 ohm
• Total RMS Power: 400 watts
• Class D 2 ohm Stable 4-Channel Amplifier

Description

Authorized dealer

4-Channel Class D Full-Range Amplifier

The JL Audio RD400/4 is a sleek, modern 4-channel amplifier from the RD series, designed for "do-it-yourself" audiophiles who want high performance with an easy setup. Using NexD high-speed switching technology, it delivers 400 Watts of total RMS power in a compact, efficient design. The RD400/4 is known for its "all-on-one-side" connection layout and top-mounted controls, making it very installer-friendly.

It features integrated LED clipping indicators for every channel pair. These lights allow you to set the gain (input sensitivity) to the exact point of maximum clean power without needing an oscilloscope. It also includes a durable black powder-coated finish and a top-mounted LED light strip that indicates the amplifier's overall status.

Product Details:

RD Series Class D 2 ohm Stable 4-Channel Amplifier
RMS Power Rating:

4 ohm: 75 watts x 4 channel
2 ohm: 100 watts x 4 channel
Bridged: 200 watts x 2 channel @ 4 ohm

Total power output: 400 watts
Onboard LED clipping indicator rings
1 pair of preamp output
Speaker-level (high-level) inputs (Requires adapter like the JL Audio XD-CLRAIC2-SW)
Signal sensing remote turn-on
NextD switching amplifier technology
Differential-balanced inputs help eliminate noise
Advanced Rollback Protection System prevents thermal shut-down
Input sensitivity:

Low level: 200mV - 2 volts
High level: 800mV - 8 volts

Frequency Response: 12 - 22000 Hz
Total Harmonic Distortion (THD): <1%
Signal to Noise Ratio: >104 dB
Variable high-pass filter: 50 - 500 Hz
Variable low-pass filter: 50 - 500 Hz
Fuse Rating: 40A (AFS, AGU or MaxiFuse)
4 AWG gauge amplifier wiring kit is recommended for installation
Dimensions: 9.78" L x 6.96" W x 2.13" H
Authorized Internet Dealer
2 Year Manufacturer's Warranty
MFR #: RD400/4

Product history:

	JL Audio RD400/4 (newest, current model)
	JL Audio JX400/4D (previous model, replaced by JL Audio RD400/4)
	JL Audio JX360/4 (previous model, replaced by JL Audio JX400/4D)

Frequently Asked Questions (FAQ)

My amplifier won't turn on and the status LED is completely dark. What should I check first?

Check your battery voltage and remote turn-on lead. The RD400/4 requires at least 10V to power up. If the voltage is lower, the amp will stay off. Also, verify that the 40A main fuse near the battery hasn't blown.

How do I use the built-in LED clipping indicators to set my gain without special tools?

Play a 1kHz test tone at 3/4 volume. Turn the "Input Sens." up until the LED turns red, then back it off slightly until it turns off. This ensures maximum clean power without risking speaker damage or distortion.

The status LED is alternating between Red and Blue. What does this mean?

This indicates a continuous "Over Current" condition, often caused by a short circuit in the speaker wiring or a speaker impedance that is too low. Check for loose wire strands touching the vehicle chassis or other terminals.

My factory radio doesn't have a remote turn-on wire. Can I still use this amplifier?

Yes. Set the "Turn-On Mode" switch to "DC" or "Signal." This allows the amp to sense the audio signal from your factory wires and turn on automatically, eliminating the need for a separate 12V remote lead.

Can I bridge this 4-channel amp to power two subwoofers?

Yes. Connect the positive (+) of the sub to the Left+ terminal and the negative (-) to the Right- terminal of each channel pair. Ensure each subwoofer has a minimum impedance of 4 ohms to prevent the amp from entering protection mode.

The amplifier keeps shutting off during high-volume playback. Is it overheating?

If the LED is solid Red, it is in thermal protection. Ensure there is at least 1 inch of clearance above the amp for airflow. Avoid mounting it upside down or in small, unventilated spaces where heat can build up.

I’m hearing a constant ticking or thumping sound from my speakers. How do I fix it?

This usually signals a recurring over-current fault. Inspect your speaker wires for any "pinched" areas where the insulation might be worn, or use a multimeter to ensure your speakers aren't dropping below 2 ohms per channel.

Should I use 8 AWG or 4 AWG wire for this specific 400W model?

For the RD400/4, 4 AWG 100% pure copper wire is highly recommended to prevent voltage drops. While 8 AWG may work for very short runs (under 10ft), 4 AWG ensures the amp gets the current it needs to perform at its full 400W rating.

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Durability		4.9
Value		4.9
Features		5
Design		5
Usability		5

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JL Audio RD400/4

$379.99

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4-Channel Class D Full-Range Amplifier

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