Mobile Electronics› Power Accessories

JL Audio

4-Channel Class D Full-Range Amplifier

$299.99

SKU: JX400/4D

In Stock
In Stock
Ships by Sep 12
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

The JL Audio JX400/4D is a four-channel, full-range amplifier utilizing Class D technology for efficient power delivery. This compact unit provides 70 watts RMS per channel at 4 ohms or 100 watts RMS per channel at 2 ohms, with a maximum output of 400 watts. It includes integrated high-pass and low-pass filters for precise frequency control in multi-channel audio setups.
Show original supplier description
The JL Audio JX400/4D is a four-channel, full-range car amplifier designed for high-efficiency operation using Class D technology. This amplifier features a robust MOSFET power supply and delivers 70 watts RMS per channel at 4 ohms, or 100 watts RMS per channel at 2 ohms, for a total output capacity of 400 watts. It is also bridgeable to 200 watts RMS x 2 at 4 ohms, allowing for versatile sound system configurations. The amplifier includes built-in high-pass and low-pass filters, enabling users to tailor audio responses and ensure optimal signal processing for various speaker or subwoofer combinations. With dimensions of 230 mm x 195 mm x 55 mm, the compact chassis is engineered for easier installation in diverse vehicle setups. Gain settings can be adjusted on each channel to achieve desired volume levels without distortion. The JX400/4D is capable of handling a 2-ohm speaker load when operating in stereo mode, though proper impedance matching is required to maintain efficient power delivery and protect the unit from overloading.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandJL Audio
Part NumberJX400/4D
CategoryMobile Electronics

We’re here — turning wrenches, just like you.

Call us, follow along, or come say hi.

(760) 282-4645 Instagram Google

Buy with Confidence

Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

View Full Return Policy

Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

View Full Shipping Policy