JL Audio builds their A-Series amplifiers with the high-end technology that's made their amps legendary. These hard-working amps feature an advanced thermal and low-impedance protection system that doesn't shut your amp down when the going gets tough. Instead, it rolls back peak voltage demands to protect the amp, while continuing to play your music at a safe power level.

The A6450 6-channel amplifier puts up to 110 watts RMS out each channel, and JL Audio's patented Class-AB amp circuitry delivers exceptional, natural sound with extremely low distortion. JL Audio amps use "differential-balanced inputs" to isolate the signal's ground from the chassis ground, reducing noise and making this amp compatible with almost any system, including most factory radios.

Tunable high- and low-pass filters, and a bass boost give you precise control over your sound. The optional RBC-1 remote lets you dial in your bass from the comfort of your front seat.

Product Highlights:

  • 6-channel car amplifier
  • at 14.4 volts:
    • 70 watts RMS x 6 at 4 ohms (110 watts RMS x 6 at 2 ohms)
    • 220 watts RMS x 3 bridged at 4 ohms
  • at 12.5 volts:
    • 45 watts RMS x 6 at 4 ohms (75 watts RMS x 6 at 2 ohms)
    • 150 watts RMS x 3 bridged at 4 ohms
  • differential-balanced inputs
  • Advanced Rollback Protection System
  • variable high- and low-pass filter (50-200 Hz, 12 dB/octave)
  • switchable bass boost on ch. 5 and 6 (0, 6 dB at 48 Hz)
  • optional wired remote bass boost
  • Absolute Symmetry™ Class-AB amplifier design
  • MOSFET power and output stages
  • preamp-level inputs
  • speaker-level input with optional converter
  • 4-gauge power and ground leads and a 60-amp fuse recommended — wiring and hardware not included with amplifier
  • no onboard fuses — when installing multiple amps in a system, an additional 60-amp in-line fuse between the distribution block and the amplifier is recommended
  • 18-1/8"W x 2-1/2"H x 9-1/4"D
  • warranty: 2 years
  • Our 60-day money-back guarantee

My system has plenty of power. Who needs an amp?

You might think you don't need an amp because you have a 400-watt system in your car, or because your new stereo puts out 50 watts a channel. But those are peak wattage ratings, which may boil down to 15 or 20 watts per channel, using the more realistic RMS rating. An amp sends your speakers the power they need to deliver your music with clarity and impact, whether you're using factory speakers or high-performance components. And low-frequency reproduction requires lots of power, so an amp is an absolute must if you're adding a sub to your system.

Hands-on research

What's in the box?

Download owner's manual

  • 6-Channel system amplifier
  • 2.5mm Allen wrench
  • Owner's Manual

Product Research

Features
Inputs and Outputs Notes

Features

Six-Channel System Amplifier: The JL Audio A6450 is a class AB system amplifier that is rated at 70 Watts RMS x 6-channel in 4 ohm at 20 to 20,000Hz with a signal-to-noise-ratio of  104 dB and a total harmonic distortion of 1% while receiving 14.4 Volts or 45 Watts RMS x 2-channel in 4 ohm with a total harmonic distortion of 0.08% while receiving 12.5 Volts. The amplifier can be bridged to output 220 Watts RMS x 3-channel in 4-ohm at 14.4 Volts or 150 Watts RMS x 3-channel in 4-ohm at 12.5 Volts. The main purpose of a 6-channel system amplifier is to give you the ability and convenience to power two pair of full-range speakers and a pair of subwoofers simultaneously with one amplifier.

Absolute Symmetry A/B Circuitry: The JL Audio full-range amplifier benefits from a patented technology called Absolute Symmetry to deliver amazing fidelity with extremely low distortion over a wide range of load impedances. The JL Audio amplifier features a revolutionary Class A/B circuit that employs identical N-Channel MOSFET transistors for push and pull with true buffering from the load impedance. This is accomplished via a patented circuit that reverses the operation of one of the transistors in each pair to achieve absolute power symmetry and extremely low distortion over a wide range of load impedances.

Simplified Gain Setting:  The A-Series amplifier makes setting the gain level of the amp via the input sensitivity control very simple. All you need is Digital AC Voltmeter (142TK12V, sold separately) and a Test CD Disc (503CD104, sold separately) with a sine-wave test-tone recorded at 0 dB reference level in the frequency range to be amplified for that set of channels (50 Hz for subwoofer channels, 1 kHz for a midrange application).

Differential-Balance Inputs: The JL Audio amplifier features differential-balanced input architecture to effectively control noise and ensure compatibility with a wide variety of source units, including many OEM systems. Without resorting to line output converters, you can directly connect most OEM source units to the JL Audio amplifier without creating any noise or compatibility issues. Unlike conventional single-ended inputs, the differential-balanced design does not connect one side of the audio signal to chassis ground.  This eliminates any voltage sensitivity between one input terminal and ground and greatly reduces the incidence of alternator whine in a typical car audio installation. The A6450 amplifier provides range switching on each of its inputs via the "Input Voltage" switch. This permits connection to a wide range of source voltages while retaining excellent sensitivity setting precision.

Note: The Channel 5 & 6 input section is designed to accept only line-level signals. You will need two speaker wire to RCA adaptors (136CLR2SW, sold separately) to connect this amplifier to your headunit via speaker-level.

Input Mode: The A6540's input section allows you to send signal to the amplifier section through the use of two, four or six differential-balanced inputs. Input connections on the amplifier are via three pairs of traditional RCA-type jacks. You can send six discrete channels of audio signal into the amplifier by connecting all six inputs to the six preamp outputs on back of your headunit via three sets of stereo RCA cables. You can also connect the amplifier using only channels 1, 2, 3 & 4 and the amplifier will sum those channels to create an audio signal for channels 5 & 6. If you use only two channels of input to deliver signal to all six amplifier channels, it will be necessary to split the two signals with an RCA Y-adapter to connect to channels 1, 2, 3 & 4 so those inputs can sum the input of channels 5 & 6.

Active Crossover: The A-series amplifier provides a crossover network to fine tune your system effectively and accurately. The A6450 offers the following independent crossover adjustments for the 1 & 2, 3 & 4, and 5 & 6 channels.

Filter Mode: The amplifier allows you to select either a Low Pass, High Pass or Full-Range operation of the amplifier's 1 & 2 channels, 3 & 4 channels, and 5 & 6 channels.
Variable Frequency:
You can set the amplifier's Low Pass or High Pass crossover from 50 to 200 Hz for channels 1 & 2 and channels 3 & 4.

Bass Controls: The bass boost circuit of the A-Series amplifier offers the following controls that only effect channels 5 & 6 of the amplifier.

Bass Boost: The amplifier is equipped with a fixed +6dB, 48 Hz Bass Boost.
Remote Bass Port:
The amplifier is equipped with a connection for a wired Remote Bass Control (136RBC1, sold separately) that allows fully variable boost control (0-12dB) from the front of your vehicle.

Advanced Rollback Protection: Should an A-series amplifier ever overheat, its
intelligent, unregulated power supply reacts by limiting available peak voltage until the amplifier returns to a safe temperature range. Likewise, if an impedance lower than optimal for the amplifier is present at the outputs, the A-series amplifier will roll back peak voltage to protect itself without shutting down.

Note: There is only one condition that will shut down the A-Series amplifier completely and that is if the battery voltage of your vehicle drops below 10 volts.

Protection Circuitry With Status Indicator Lights: There are two status indicator lights on the right side of the amplifier.

Power (Green): This LED lights green to indicate that the amplifier is turned on and operating normally.
Protect (Red):
The Protection LED lights Red to indicate the amplifier's protection circuitry has been activated to prevent product failure due to a short-circuit or a dangerously low impedance connected to the amplifier's outputs.

Inputs and Outputs Notes

Left Side Of Amplifier:

Power and Ground: The JL Audio amplifier's set-screw Power and Ground connections are designed to accept 8 to 4 AWG power wire.
Remote Turn-On:
The A-series amplifier's set-screw turn-on lead will accept 18 to 12 AWG  wire.
Speaker Outputs:
The A6450 amplifier's twelve set-screw speaker terminals will accept 16 to 8 AWG speaker wire.

Right Side Of Amplifier:

Preamp Inputs: The amplifier features three sets of differential-balanced RCA jack inputs. The amplifier's input level can be set to Low (200mV-2V RMS) when connecting the amplifier to a low-level preamp signal or set to High (800mV-8V RMS) when connecting the amplifier to a high-level speaker signal.
Remote Bass Port:
The amplifier is equipped with a connection for a wired Remote Bass Control (136RBC1, sold separately).

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team — they open the box, verify contents, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

JL Audio A Series A6450 Reviews

Average Customer Review:

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had to replace twice

Written By GeorgeM, Sierra Vista AZ on Thursday, April 28, 2011

Had this amp professionally installed and the amp performed great for 6
months then I had to have it replaced as 3 of the 6 channels went out. I then
had the new one installed and it lasted 2 years before all 6 channels went out.
Replaced with a Rockford Fosgate and have never looked back.

You won't regret purchasing a JLA6450

Written By Dave, Orlando,Florida on Tuesday, February 03, 2009

I had this unit installed professionally (wise decision) everything I heard about JL gear is fact, Excellent product. Along with the JL A6450 a JL10W3v3
is handling the bottom end, along with a pair of Polk 6x9's for the mids and Polk MM6500's take care of the high end beautifully!
The A6459 is the heart of the system and worth every dime! Do yourself a favor and pick one up,it Kick's
Dave.......

Get everything you’ll need to enjoy your new JL Audio A Series A6450

Bring the music from your amp to your speakers.
Patch cables take the music from your stereo to the amplifier. Most amp wiring kits don't include them.
Add a remote and control your amp from the driver's seat.
Helps protect your car's charging system and improves power handling. Required power and ground wires not included with cap.
The right tools will make the installation easier.
Have your new amplifier put in by a qualified professional in your area.
T-Spec 12-gauge Speaker Wire

T-Spec 12-gauge Speaker Wire

Black/white jacket — priced per foot

Item #: 120SW12WB1

(30)

T-Spec 2-Channel RCA Patch Cables

T-Spec 2-Channel RCA Patch Cables

Available in 7 different lengths (17-foot)

Item #: 120RCA172

(27)

$19.99
Add to Cart
EFX 2-Channel RCA Patch Cables

EFX 2-Channel RCA Patch Cables

Elite Series Braided Multi-Core RCA patch cables — available in 5 different lengths (12-foot)

Item #: 142RE12

$64.95
Add to Cart
EFX 2-Channel RCA Patch Cables

EFX 2-Channel RCA Patch Cables

Core Series Twisted RCA patch cables — available in 5 different lengths (3-foot)

Item #: 142RCT3B

$6.95
Add to Cart
EFX 2-Channel RCA Patch Cables

EFX 2-Channel RCA Patch Cables

Reference Series Multi-Core RCA patch cables — available in 5 different lengths (17-foot)

Item #: 142RR17

$23.95
Add to Cart
JL Audio RBC-1

JL Audio RBC-1

Remote bass control for JL Audio amps

Item #: 136RBC1

(23)

$34.99
Add to Cart
T-Spec Capacitor

T-Spec Capacitor

1.5-farad capacitor with red LCD meter

Item #: 12015DDC

(11)

$79.99
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S&G Tool Aid 87650

S&G Tool Aid 87650

Door Trim and Panel Removal Tool

Item #: 18187650

(71)

Pro.Fit Trim Panel Tool

Pro.Fit Trim Panel Tool

Remove your vehicle's trim panels without damage

Item #: 042DM4022

(88)

Skewdriver Pro SPK4042

Skewdriver Pro SPK4042

Ratcheting straight and offset screwdriver set with 40 bits (Skewdriver Pro with ratchet handle, pictured)

Item #: 180SPK4042

(8)

$49.99
Add to Cart
Pro.Fit Wire Worm

Pro.Fit Wire Worm

Installation tool helps route wiring through tight spaces

Item #: 042DM4533

(34)

$12.99
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Pro.Fit Hook Tool Set

Pro.Fit Hook Tool Set

Installation tools — pair

Item #: 042DM3022

(9)

Metra Crimp Tool and Connectors

Metra Crimp Tool and Connectors

Package contains crimp tool and over 150 pieces

Item #: 120CRIMPKT

(15)

$19.99
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S&G Wire Cutter/Stripper Tool

S&G Wire Cutter/Stripper Tool

Cuts and strips 12- to 22-gauge wire

Item #: 18119100

(17)

$19.99
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Install Bay IB35400

Install Bay IB35400

Premium door panel and trim tool

Item #: 12035400

$15.99
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Install Bay 3320

Install Bay 3320

Auto-ranging digital multimeter

Item #: 1203320

$39.99
Add to Cart
InstallCard: Amp or Equalizer

InstallCard: Amp or Equalizer

Prepaid professional amplifier or EQ installation

Item #: 597421003

(18)

$79.99
Add to Cart