Mobile Electronics Power Accessories

JL Audio

J2 320.4 4-Channel Amplifier

$299.99

SKU: J2320.4

In Stock
In Stock
Ships by Sep 13
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

The JL Audio J2 320.4 is a 4-channel car amplifier offering 60 watts RMS x 4 at 4 ohms or 80 watts RMS x 4 at 2 ohms. It can also be bridged to deliver 160 watts RMS x 2 at 4 ohms.

This Class B amplifier features differential-balanced inputs and a MOSFET switching power supply. It includes variable low-pass and high-pass filters with slopes of 12 dB/octave, and a variable bass boost at 45 Hz. The amplifier supports both preamp and speaker-level inputs.
Show original supplier description
The JL Audio J2 320.4 is a 4-channel car amplifier designed to power your vehicle's sound system with 60 watts RMS per channel at 4 ohms, or 80 watts RMS per channel at 2 ohms. For more demanding applications, it can be bridged to provide 160 watts RMS to a subwoofer or two speakers at 4 ohms. This Class B amplifier utilizes a MOSFET switching power supply for efficient operation. It features differential-balanced inputs to minimize noise and interference. For precise audio tuning, the J2 320.4 is equipped with variable low-pass filters (40-150 Hz) and variable high-pass filters (60-1.2 kHz), both with 12 dB/octave slopes. A variable bass boost feature allows for 0-12 dB enhancement at 45 Hz. Connectivity options include both preamp and speaker-level inputs, making it versatile for integration with various head units. The amplifier has a frequency response of 10-25 kHz and a THD of 1% at its rated RMS power. The recommended fuse rating is 30A x 2, and 4-gauge power and ground leads are advised, though wiring and hardware are sold separately. Its dimensions are 15-13/16"W x 2-3/16"H x 9-5/8"D.

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 NumberJ2320.4
CategoryMobile Electronics

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

Call us, follow along, or come say hi.

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