JL Audio J2320.4 User Manual

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owner’s manual

320W 4-Channel,Full-RangeAmplifier

Thank you for purchasing a JL Audio amplifier for your automotive sound system.

Your amplifier has been designed and manufactured to exacting standards in order to ensure years of musical enjoyment in your vehicle. For maximum performance, we highly recommend that you have your new amplifier installed by an authorized JL Audio dealer. Your authorized dealer has the training, expertise and installation equipment to ensure optimum performance from this product. Should you

decide to install the amplifier yourself, please take the time to read this manual thoroughly so as to familiarize yourself with its installation requirements and setup procedures.

If you have any questions regarding the instructions in this manual or any aspect of your amplifier’s operation, please contact your authorized JL Audio dealer for assistance. If you need further assistance,

please call our Technical Support Department at (954) 443-1100during business hours.

Protect Your Hearing!

 

 

 

 

 

Installation Applications

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Planning Your Installation

We value you as a long-termcustomer. For

 

 

 

 

This amplifier is designed for operation in

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

It is important that you take the time to read

that reason, we urge you to practice restraint in

 

 

vehicles with 12 volt, negative-groundelectrical

 

 

 

 

 

 

 

 

 

 

this manual and that you plan out your

the operation of this product so as not to damage

 

 

systems. Use of this product in vehicles with

 

 

 

 

 

 

 

 

 

 

 

 

 

 

installation carefully. The following are some

your hearing and that of others in your vehicle.

 

 

positive ground and/or voltages other than 12V

 

 

 

 

 

 

 

 

 

 

considerations that you must take into account

Studies have shown that continuous exposure to

 

 

may result in damage to the product and will void

 

 

 

 

 

 

 

 

 

 

when planning your installation.

high sound pressure levels can lead to permanent

 

 

the warranty.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(irreparable) hearing loss. This and all other

 

 

 

 

This product is not certified or approved for

 

 

 

 

 

 

 

 

 

 

Cooling Efficiency Considerations:

high-poweramplifiers are capable of producing

 

 

use in aircraft.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The outer shell of your JL Audio amplifier is

such high sound pressure levels when connected

 

 

 

 

Do not attempt to “bridge” the outputs of this

 

 

 

 

 

 

 

 

 

 

designed to remove heat from the amplifier

to a speaker system. Please limit your continuous

 

 

amplifier with the outputs of a second amplifier,

 

 

 

 

 

 

 

 

 

 

circuitry. For optimum cooling performance, this

exposure to high volume levels.

 

 

 

 

 

including an identical one.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

outer shell should be exposed to as large a volume

While driving, operate your audio system in

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

of air as possible. Enclosing the amplifier in a

a manner that still allows you to hear necessary

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

small, poorly ventilated chamber can lead to

noises to operate your vehicle safely (horns,

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

excessive heat build-upand degraded

sirens, etc.).

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

performance. If an installation calls for an

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

enclosure around the amplifier, we recommend

Serial Number

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

that this enclosure be ventilated with the aid

In the event that your amplifier requires

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

of a fan. In normal applications, fan-cooling

service or is ever stolen, you will need to have

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

is not necessary.

 

 

 

 

 

 

a record of the product’s serial number. Please

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Remote Turn-On

take the time to enter that number in the space

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Connector

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(pg. 6)

provided below. The serial number can be found

 

 

 

 

 

 

 

 

 

 

 

 

 

CH 1 & CH 2

 

 

 

 

 

 

 

 

 

CH 3 & CH 4

 

 

 

 

 

 

 

+12 V Power

 

Chassis Ground

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

on the bottom panel of the amplifier and on the

 

 

 

 

 

 

 

 

 

 

 

 

 

Speaker Outputs

 

 

 

 

 

 

 

 

Speaker Outputs

Fuses

 

 

Connector

 

 

Connector

amplifier packaging.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(pg. 9)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(pg. 9)

 

 

 

 

 

 

(pg. 5)

 

 

(pg. 5)

 

 

(pg. 5)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Serial Number:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

30A

 

 

 

 

 

30A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CHANNEL 1 (L)

CHANNEL 2 (R)

CHANNEL 3 (L)

CHANNEL 4 (R)

 

 

FUSES

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Made in China

 

 

 

 

Bridged

 

 

 

 

 

 

 

 

 

 

 

 

Bridged

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Power Status

Channel Input

CH 1 & CH 2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Protection Status

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Indicator

 

 

 

Selector

 

 

Preamp Input Jacks

 

 

 

 

 

 

Indicator

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Bass Boost (pg.

11)

High-Level

(pg. 7)

Left & Right

(pg. 6) CH 3 & CH 4

 

 

High Level (pg.

11)Bass Boost

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Control

 

Input Jack

 

 

Preamp Output Jacks Preamp Input Jacks

 

 

Input Jack

 

 

 

 

Control

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(pg. 9)

 

 

 

(pg. 6,7)

 

 

 

 

(pg.

9)

 

 

 

(pg. 6)

 

 

(pg. 6,7)

 

 

 

 

(pg. 9)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Channel 1 & 2 Controls

Power

CH 3&4

 

Input From

Bass Boost

1&2

| 3&4

 

High-LevelInputs

 

 

 

Off

+12dB

 

 

 

 

 

 

40

150

60 1.2k

min max

 

 

 

 

Low-Pass

High-Pass

 

 

 

 

HP | Off | LP

 

 

 

 

 

 

 

 

 

Filter Mode

Filter Frequency (Hz)

Input Sens.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Pre-Outs

Amplifier Inputs

Channel 3 & 4 Controls

 

LEFT

CH 1 (Left)

CH 3 (Left)

 

 

Protect

 

 

 

 

 

 

 

High-LevelInputs

 

 

 

min max

60 1.2k

40 150

 

 

 

 

High-Pass

Low-Pass

RIGHT

CH 2 (Right)

CH 4 (Right)

Input Sens.

Filter Frequency (Hz)

Bass Boost

Off

+12dB

HP | Off | LP

Filter Mode

 

 

 

 

 

 

Input Sensitivity

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Low-PassFilter

 

 

 

High-PassFilter

 

 

 

Filter Mode

 

 

 

 

 

 

 

 

Frequency Control

 

 

Control

 

 

 

Frequency Control

 

Selector

 

 

 

 

 

 

(pg. 7)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Filter Mode

(pg. 8) High-PassFilter

Input Sensitivity(pg. 8) Low-PassFilter(pg. 8)

Selector

 

Frequency Control

Control

 

 

Frequency Control

(pg. 8)

 

(pg. 8)

(pg. 7)

 

 

(pg. 8)

 

 

 

 

Mounting the amplifier upside down is strongly discouraged.

If mounting the amplifier under a seat, make sure there is at least 1 inch (2.5 cm) of space above the amplifier’s outer shell to permit proper cooling.

Safety Considerations:

Your amplifier needs to be installed in a dry, well-ventilatedenvironment and in a manner which does not interfere with your vehicle’s safety equipment (air bags, seat belt systems, ABS brake systems, etc.). You should also take the time to securely mount the amplifier so that it does not come loose in the event of a collision or a sudden jolt to the vehicle.

Stupid Mistakes to Avoid

Check before drilling any holes in your vehicle to make sure that you will not be drilling through a gas tank, brake line, wiring harness or other vital vehicle system.

Do not run system wiring outside or underneath the vehicle. This is an extremely dangerous practice which can result in severe damage to your vehicle and person.

Protect all system wires from sharp metal edges and wear by carefully routing them, tying them down and using grommets and loom where appropriate.

Do not mount the amplifier in the engine compartment, under the vehicle, on the roof or in any other area that will expose the amplifier circuitry to the elements.

2

JL Audio

3

Product Description

The JL Audio J2-320.4is afour-channel,fullrange audio amplifier utilizing

Class B technology for all channels.

The J2-320.4can be operated with a wide variety of source units and system configurations. For detailed specifications, please refer to Appendix B (page 13).

Typical Installation Sequence

The following represents the sequence for a typical amplifier installation, using an aftermarket source unit or OEM Interface product. Additional steps and different

procedures may be required in some applications. If you have any questions, please contact your authorized JL Audio dealer for assistance.

1) Disconnect the negative battery postconnection and secure the disconnected cable to prevent accidental re-connection during installation. This step is not optional.

2) Run 4 AWG power wire from the battery location to the amplifier mounting location, taking care to route it in such a way that it will not be damaged and will not interfere with vehicle operation. Use 2 AWG or larger power wire and a power distribution block if additional amplifiers are being installed with theJ2-320.4.

3) Connect power wire to the positive battery post. Fuse the wire with an appropriate fuse block (and connectors) within 18 inches (45 cm) wire length of the positive battery post.

This fuse is essential to protect the vehicle. Do not install the fuse until the power wire has been securely connected to the amplifier.

4) Run signal cables and remoteturn-onwire from the source unit to the final amplifier mounting location.

5) Run speaker cables from the speaker systems to the amplifier mounting location.

6) Find a good, solid metal grounding point close to the amplifier and connect the negative power wire to it using appropriate hardware. Use the same size power wire as thewire connected to the “+12VDC” connection

(minimum 4 AWG), no longer than 36 inches (90 cm) from the amplifier to the ground connection point. In some vehicles, it may be necessary to upgrade the battery ground wire. (See page 5 for important notice).

7) Securely mount the amplifier using

appropriate hardware.

8) Connect the positive and negative power wires to the amplifier.

9) Connect the remoteturn-onwire

to the amplifier.

10)Connect the input cables to the amplifier.

11)Connect the speaker cables to the amplifier.

12)Carefully review the amplifier’s control settings to make sure that they are set according to the needs of the system.

13)Install the power wire fuse (60A for a single J2-320.4)and reconnect the negative battery post terminal.

14)Turn on the source unit at a low level to double-checkthat the amplifier is

configured correctly. Resist the temptation to crank it up until you have verified the control settings.

15) Make necessary adjustments to the input sensitivity controls to obtain the right overall output and the desired balance in the system. See Appendix A (page 12) for the recommended input sensitivity setting method.

16)Enjoy the fruits of your labor with your favorite music.

4

JL Audio

Power Connections

Before installing the amplifier, disconnect the negative (ground) wire from the vehicle’s battery. This will prevent accidental damage to the system, the vehicle and your body during installation.

+ VDC

Remote

0A

The J2-320.4’s+12VDCandGroundconnections are designed to accept 4 AWG power wire.4 AWG is a minimum power wire size for this amplifier.

If you are installing the J2-320.4with other amplifiers and wish to use a single main power wire, use 2 AWG or larger main power wire (depending on the overall current demands of all the amplifiers in the system). This 2 AWG or larger power wire should terminate into a distribution block mounted as close to the amplifiers as possible and should connect to theJ2-320.4with 4 AWG power wire.

Note: Smaller AWG numbers mean bigger wire andvice-versa(1/0 AWG is the largest, 2 AWG is smaller, then 4 AWG, then 8 AWG, etc.).

To connect the power and ground wires to the amplifier, strip 1/2-inch(12 mm) of insulation from each wire and insert the bare wire into the the appropriate terminal block positions on the

J2-320.4.Use a Phillips screwdriver to secure thewire via the screw on the top of each terminal.

The “GROUND” connection should be made using 4 AWG wire and should be kept as short as possible, while accessing a solid piece of sheet metal in the vehicle. The surface of the sheet metal should be sanded at the contact point

to create a clean, metal-to-metalconnection between the chassis and the termination of the ground wire. The use of a star washer to lock down the connection is advisable.

Any wires run through metal barriers (such as firewalls), must be protected with a high quality insulating grommet to prevent damage to the insulation of the wire. Failure to do so may result in a dangerous short circuit.

Many vehicles employ small (10 AWG - 6 AWG) wire to ground the battery to the

vehicle chassis and to connect the alternator’s positive connection to the battery. To prevent voltage drops, these wires should  be upgraded to 4 AWG when installing amplifier systems with main fuse ratings above 60A.

Fuse Requirements

While the J2-320.4has two 30A ATC fuses on its power connection panel, these do nothing to protect the vehicle from a dangerous short circuit in the power wire. They only protect the amplifier. It is absolutely vital that the main power lead to the amplifier(s) in the system be fused within 18 inches (45 cm) of the positive battery post connection. The fuse value at each power wire should be high enough for all of the equipment being run from that power wire.

If only the J2-320.4is being run from that power wire, we recommend a 60A fuse be used. AFS orMAXI-typefuses are recommended.

) FUSES

30A 30A

5

Turn-OnLead

The J2-320.4is turned on and offusing a conventional +12V remote turn- on lead, typically controlled by the source unit’s remoteturn-onoutput.

+ VDC

Remote

0A

The amplifier will turn on when +12V is present at its “Remote” input and turn off when +12V is switched off. If a source unit does nothave a dedicated remote turn-on output, the amplifier’sturn-onlead can be connected to +12Vvia a switch that derives power from an ignitionswitched circuit.

18 AWG wire is more than adequate for the remote turn-onconnection. To connect the remoteturn-onwire to the amplifier, strip1/2-inch(12 mm) of insulation from the wire

and insert it into the “Remote” receptacle on the power connector. Tighten the connector down using a Phillips screwdriver.

Input Sections

The J2-320.4’shas two input sections: one for Channels 1&2 and another for Channels 3&4. These input sections allows you to send signals to the amplifier sections through the use of either two or four inputs. Each input section offers

two input connection methods, one for highlevel (speaker level) signals and one for low-level(preamp level) signals.

1)Low-LevelInputs:A standard left/ right pair of RCA type jacks in the

“Amplifier Inputs” section is used for preamp level(low-level)signal input on theJ2-320.4.This is the preferred connection method whenever available.

Amplifier Inputs

CH 1 (Left)

CH 3 (Left)

CH 2 (Right) CH 4 (Right)

2)High-Level Inputs: If your system does not offer a preamp level signal option, you can connect speaker level signals directly to the“High-Level Inputs” connectors using the supplied mating connectors and wire harnesses. Simply splice the appropriate left/right and positive/negative wires to the

included harnesses and plug the harness into the “High-Level Inputs” connectors on the amplifier. TheJ2-320.4will attenuate the highlevel signals to make them compatible with its input stages.

Channel 1 & 2 Contro

er

 

 

In

 

 

 

High-LevelInputs

 

150

60

1.2k

 

w-Pass

High-Pass

 

Filter Frequency (Hz)

I

6

JL Audio

Make sure you observe correct polarity in making the “High Level Input” connections. Failure to do so will reduce bass and affect stereo imaging.

The connections for the “High Level Inputs” plug wires are as follows from left to right on the plug:

Channels 1&2 (FRONT)

White: Left Positive (+)

White/Black: Left Negative (–)

Black: Common Ground (rarely used)*

Gray: Right Positive (+)

Gray/Black: Right Negative (–)

Channels 3&4 (REAR or SUB)

Green: Left Positive (+)

Green/Black: Left Negative (–)

Black: Common Ground (rarely used)*

Purple: Right Positive (+) Purple/Black: Right Negative (–)

*The only time you will use the Common Ground connections is with some older (pre-1980’s)factory systems or head units that ground their speakers to chassis ground. To use these connections, ground the black wires on the plugs to chassis ground andonly connect the Left and Right Positive plug wires to the factory radio outputs.

“CH 3&4 Input From” Switch

If you wish to send four discrete channels of input into the J2-320.4,simply use all four inputs (Channels 1 & 2 and Channels 3 & 4) and set the

CH 3&4 Input From” switch to “3&4”.

2 Controls

Pr

 

CH 3&4

 

 

Input From

 

puts

1&2 | 3&4

 

 

 

1.2k

min max

 

ass

 

 

z)

Input Sens.

R

If you wish to feed all four channels by using only two channels of input, set the “CH 3&4 Input From” switch to “1&2” and use only the inputs to channels 1 & 2.

Input Sensitivity Controls

The controls labeled “Input Sens.” located ineach Channel Controlssection can be used to match the source unit’s output voltage to the input stage of each pair of amplifier channels for maximum clean output. Rotating the control clockwise will result in higher sensitivity (louder for a given input voltage). Rotating the control counter-clockwise will result in lower sensitivity (quieter for a given input voltage.)

2 Controls

P

 

CH 3&4

 

 

Input From

 

nputs

1&2 | 3&4

 

 

 

1.2k min max -Pass

z)Input Sens.

To properly set the amplifier for maximum clean output, please refer to Appendix A (page 12) in this manual. After using this procedure, you can then adjust any or all “Input Sens.levels downward if this is required to achieve the desired system balance.

Do not increase any “Input Sens.” setting for any channel(s) of any amplifier in the system beyond the maximum level established during the procedure outlined in Appendix A (page 12). Doing so will result in audible distortion and possible speaker damage.

7

Filter Controls

The active filter built into each channel section of the J2-320.4can be used to eliminate potentially harmful and/or undesired frequencies from making their way through the amplifier sections to the speaker(s). This serves to improve tonal balance and to avoid distortion and possible speaker failure. Correct use of these filters can substantially increase the longevity and fidelity of your audio system.

Channel 1 & 2 Contr

Power

I

Bass Boost

Off

+12dB

HP | Off | LP

Filter Mode

 

High-LevelInputs

40

150

60

1.2k

Low-Pass

High-Pass

Filter Frequency (Hz)

1)“Filter Mode” Control: TheJ2-320.4employs a 12dB per octave filter for each pair of channels (one filter for channels 1&2 and another filter for channels 3&4). Each of these filters can

be configured independently into one of two filter types or defeated completely by way of the three-positionFilter Modeswitches:

“HP” (High-Pass): Configures the filter to attenuate frequencies below the selected filter frequency at a rate of 12dB per octave. This is useful for connection of component speakers to one or both of theJ2-320.4’schannel pairs in abi-amplifiedsystem.

Off”: Defeats the filter completely, allowingthe full range of frequencies present at the inputs to feed the amplifier. This is useful

for systems utilizing outboard crossovers or requiring full-rangereproduction from one or both of theJ2-320.4’schannel pairs.

“LP” (Low-Pass): Configures the filter to

attenuate frequencies above the selected filter frequency at a rate of 12dB per octave. This is useful for connection of subwoofer(s) to one or both of the J2-320.4’schannel pairs in abi-amplifiedsystem.

2)“Filter Freq. (Hz)” TheJ2-320.4has separate Filter Frequency controls in each Channel Controls section for thelow-passfilter and thehigh-passfilter. You will only use one of these in each channel section, depending on which“Filter Mode” you have selected (or none of them if you have selected the“Off” position for the“Filter Mode”).

The High-Passfilters in theJ2-320.4are fullyvariable between 60 Hz and 1.2 kHz (1200 Hz) via the control knobs labeled “High-Pass”.The “8 o’clock” position corresponds to 80 Hz and is agood starting point for system tuning.

The Low-Passfilters in theJ2-320.4are fullyvariable between 40 Hz and 150 Hz via the control knobs labeled “High-Pass”.The “12 o’clock” position corresponds to 80 Hz and is agood starting point for system tuning.

“BASS BOost” Controls

Each channel pair of the J2-320.4includes a single band,boost-onlybass equalizer controlled by a rotary knob marked“Bass Boost”.

This control has a boost range of 0dB (full- counterclockwise) to +12dB (full-clockwise) and is centered at 45 Hz.

Po

Bass Boost

Off

+12dB

4

L

HP | Off | LP

Filter Mode

Pre-OUTS

The J2-320.4incorporates apass-throughpreamp output section, so that additional amplifiers can be easily added to the system. Thispass-throughpre-ampoutput delivers a summed stereo signal , combining the Ch 1 and 3signals into a Left Preamp Output Signal and the Ch. 2 and 4 signals into a Right Channel Preamp

Output signal.

The preamp output signal is not affected by the Bass Boostprocessing selected for the amplifier or by any crossover filter selected (if the input signal isfull-range,the preamp output will befull-range).

Note: The signal level of the “Preamp Outputis always line-level (low voltage).

Speaker OUTPUTS

The J2-320.4’sspeaker outputs are designed to accept 16 AWG - 8 AWG wire.

Each pair of the J2-320.4’schannels are designed to deliver power into speaker loads equal to or greater than 2 ohms per channel when usinga “stereo” configuration and speaker loads equal to or greater than 4 ohms per bridged pair ofchannels when using a “bridged” configuration.

Channel 1 & 2 Contr

Power

Bass Boost

Off

+12dB

HP | Off | LP

Filter Mode

 

High-LevelInputs

40

150

60

1.2k

Low-Pass

High-Pass

Filter Frequency (Hz)

 

Pre-Outs

 

4

LEFT

CH

om

&4

 

 

max

ens. RIGHT CH

Speaker loads below 2 ohms nominal per channel are not recommended and may cause the amplifier to initiate a protection mode.

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9

Bridging Considerations

Bridging is the practice of combining the output of two amplifier channels to drive a single load. When bridged, each channel produces signals of equal magnitude, but opposite polarity. The combined output of the two channels provides twice the output voltage available from a single channel. The J2-320.4has been designed for bridging of its channel pairs without the need for input inversion adaptors.

To bridge a pair of channels, use the

Left +” and “Right speaker connectors only(the “Left andRight +remain unused). When bridged, each channel will deliver optimum power into a 4 ohm load.

When a pair of channels are bridged, they will deliver 160W x 1 into a 4 ohm load or 120W x 1 into an 8 ohm load. Operating a pair of bridged channels into a load lower than 4 ohms is not recommended.

Because a bridged pair of channels requires that both channels receive input, you need to connect both left and right inputs to the source unit. Connection of only one input will result in reduced power output, increased distortion and can cause the amplifier to overheat.

Do not do this!

When a pair of the J2-320.4’schannels are operating in bridged mode, the output will be in mono (only one channel). This mono channel can contain right channel only information, left channel only information or the sum of

the information from both the right and left channels. In order to achieve one of these options, configure the inputs to that pair of channels in one of these two ways:

1)Left Channel Only or Right Channel Only Information: If you wish to send a left-only or right-only signal to a pair of the J2-320.4’s channels, use a “Y-Adaptor” to split the single channel signal into both left and right RCA inputs. This option is useful when using a pair of the J2-320.4’s channels to drive left channel speakers only and the other pair of the J2-320.4’s channels to drive right channel speakers only.

2)Left + Right Channel Information:

When bridged and fed by a stereo input, a pair of the J2-320.4’schannels will automatically combine the left and right channels into asummed mono (left + right) channel. This option is useful when using a pair of theJ2-320.4’schannels to drive a subwoofer system or a summed mono center channel.

AMPLIFIER Status Indicator Lights & Protection Circuitry

There are two status indicator lights on the control panel of the amplifier.

Bass Boost

Off

+12dB

HP | Off | LP

Filter Mode

 

C

ls

 

 

 

 

Power

 

 

 

Protect

 

 

 

 

 

 

 

Bass B

 

H

el Inputs

 

 

 

 

 

 

 

 

Off

+

40

150

k

40

150

 

 

Low-Pass

s

Low-Pass

HP | Of

 

 

 

 

 

Filter Fr

Frequency (Hz)

Filter M

1)Power(Green): lights to indicate that the amplifier is turned on and operating normally. Located at the far left of the control panel.

2)Protect(Red): Indicates that the amplifier protection circuitry has been activated

to prevent product failure due to thermal overload, short-circuitor a dangerously low impedance connected to the amplifier outputs. Connecting the speaker outputs to an impedance lower than 2 ohms stereo (4 ohms bridged) will cause this protection

mode to activate. When this protection mode is activated, the amplifier will shut down to protect its circuitry. When the problem is corrected, the amplifier will return to normal operation and the “Protect” LED will shut off.

Servicing your TMA Amplifier

If your amplifier fails or malfunctions, please return it to your authorized JL Audio dealer so that it may be sent in to JL Audio for service. There are no user serviceable parts or fuses inside the amplifier. The unique nature of the circuitry in the JL Audio amplifiers requires specifically trained service personnel. Do not attempt

to service the amplifier yourself or through unauthorized repair facilities. This will not only void the warranty, but may result in the creation of more problems within the amplifier.

If you have any questions about the installation or setup of the amplifier not covered in this manual, please contact your dealer or technical support.

JL Audio Technical Support:

(954) 443-1100

9:00 AM – 5:30 PM (Eastern Time Zone)

Monday - Friday

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JL Audio

11

Appendix A:

Input Sensitivity Level Setting

Following the directions below will allow the installer to adjust the input sensitivity of each amplifier channel pair simply and easily in just a few minutes using equipment which is commonly available in installation bays.

Necessary Equipment

Digital AC Voltmeter

CD with a sine-wavetest 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). Do not use attenuated test tones (-10 dB, -20 dB, etc.).

The Nine-StepProcedure

1)Disconnect the speaker(s) from the amplifier’s speaker output connectors.

2)Turn off all processing (bass/treble, loudness, EQ, etc.) on the source unit, processors (if used) and amplifier. Set fader control to center position and subwoofer level control to 3/4 of maximum. If connected, set the amplifier’s Remote Bass Control at maximum (full clockwise).

3)Turn the “Input Sens.” control all the way down.

4)Set the source unit volume to 3/4 of full volume. This will allow for reasonable gain overlap with moderate clipping at full volume.

5)Using the chart on this page, determine the target voltage for input sensitivity adjustment according to the nominal impedance of the speaker system connected to the amplifier outputs.

6)Verify that you have disconnected the speakers before proceeding. Play a track with an appropriate sine wave (within the frequency range to be amplified) at 3/4 source unit volume.

7)Connect the AC voltmeter to the speaker output connectors of the amplifier. Make sure you test the voltage at the correct connectors (+ and –).

8)Increase the “Input Sens.” control until the target voltage is observed with the voltmeter.

9)Once you have adjusted the amplifier to its maximum low-distortionoutput level,

reconnect the speaker(s). The “Input Sens.” controls can now be adjusted downward if the amplifier requires attenuation to achieve the desired system balance.

Do not increase any Input Sens.setting for any amplifier channel or channel pair in the system beyond the maximum level established during this procedure. Doing so will result in audible distortion and possible speaker damage.

It will be necessary to re-adjustthe“Input Sens.” for the affected channels if any equalizer boost is activated after setting the

“Input Sens.”with this procedure. This applies to any EQ boost circuit, including source unit tone controls or EQ circuits. EQ cuts will not requirere-adjustment.

Nom.

Target AC Voltage

Impedance

Stereo

Bridged

 

 

 

 

15.5 V

31 V

15.5 V

28 V

15.5 V

25 V

14 V

not recommended

12.5 V

not recommended

 

 

 

Appendix B:

J2-320.4Specifications

General Specifications:

Recommended Fuse Value: 60A

Recommended Fuse Type: AFS, AGU or MaxiFuse™ at battery, 2 x 30A ATC fuses on amplifier chassis

Input Sections:

No. of Inputs: Two Stereo Pairs

Low-LevelInputs:Single-endedwith RCA jack inputs

Low-LevelInput Range: 200mV - 4V RMS

High-LevelInputs:Single-endedwith molded connector

High-LevelInput Range: 2V - 10V RMS

Amplifier Section:

Amplifier Topology: Class B with complementary bi-polaroutput stage

Power Supply: PWM switching type, unregulated

Rated Power with less than 1% THD (14.4V supply): Stereo, all channels driven:

60W RMS x 4 @ 4 ohms, 80W RMS x 4 @ 2 ohms

Bridged, all channels driven:

120W RMS x 2 @ 8 ohms, 160W RMS x 2 @ 4 ohms

Frequency Response: 10 Hz - 25 kHz +/- 0.5 dB

Crossover Sections:

Filter Type: 12dB/octave Butterworth

with continuously variable low-passcutoff frequency selection from40-150Hz andhigh-passcutoff frequency selection from 60Hz - 1.2 kHz.

Configurable as Low-PassorHigh-Pass.Defeatable.

Preamp Output:

2-Channel,pass-throughwith unity gain,RCA-typejacks.

Dimensions (LxWxH):

15.40" x 9.60" x 2.15" (391 mm x 244 mm x 55 mm)

Due to ongoing product development, all specifications are subject to change without notice.

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JL Audio

13

Appendix C: TROUBLESHOOTING

“How do I properly set the input sensitivity on my amplifier”

Please refer to Appeaset the input sensitivity for maximum, lowdistortion output.

“My amplifier doesn’t turn on”

Check the fuse, not just visually, but with a continuity meter. It is possible for a fuse to have poor internal connections that cannot be found by visual inspection. It is best to take the fuse out of the holder for testing. If no problem is found with the fuse, inspect thefuse-holder.

Check the integrity of the connections made to each of the

+12VDC”, “Ground”, and “Remote” terminals. Ensure that no wire insulation is pinched by the terminal set screw and that each connection is tight.

Check to make sure there is +12V at the“Remote” connection of the amplifier. In some cases, the turn-on lead from the source unit is insufficient to turn on multiple devices and the use of a relay is required. To test for this problem, jump the +12VDCwire to the Remoteterminal to see if the amplifier turns on. If this does not work, proceed to the next step.

“My amplifier’s output fluctuates when I tap on it or hit a bump”

Check the connections to the amplifier. Make sure that the insulation for all wires has been stripped back far enough to allow a good contact area inside the terminal block.

Check the input connectors to ensure that they all are making good contact with the input jacks on the amplifier.

“My amplifier turns on, but there is no output”

Check the input signal using an AC voltmeter to measure the voltage from the source unit while an appropriate test tone is played through the source unit (disconnect the input cables from the amplifier prior to this test). The frequency used should be in the range that is to be amplified by the amplifier (example: 50 Hz for a sub bass application or 1 kHz for a full range /high-passapplication). A steady, sufficient voltage (between 0.2 and8.0-volts)should be present at the output of the signal cables.

Check the output of the amplifier. Using the procedure explained in the previous check item (after plugging the input cables back into the amplifier) test for output at the speaker outputs of the amplifier. Unless you enjoy test tones at high levels, it is a good idea to remove the speaker wires from the amplifier while doing this. Turn the volume up approximately half way. 5V or more should be measured at the speaker outputs. This output level can vary greatly between amplifiers but it should not be in the millivolt range with the source unit at half volume. If you are reading sufficient voltage, check your speaker connections as explained below.

Check to ensure that the speaker wires are making a good connection with the metal inside the terminal block. The speaker wire connectors are designed to accept up to 8 AWG wire. Make sure to strip the wire to allow for a sufficient connection with the metal inside the terminal block.

14

JL Audio

15

INSTALLATION NOTES:

Use this diagram to document your amplifier’s switch and control positions.

 

 

Channel 1 & 2 Controls

Pre-Outs

Amplifier Inputs

Channel 3 & 4 Controls

 

Power

 

CH 3&4

LEFT

CH 1 (Left)

CH 3 (Left)

Protect

 

 

 

Input From

 

Bass Boost

 

1&2 | 3&4

 

 

 

 

 

 

High-LevelInputs

 

 

 

High-LevelInputs

 

 

 

 

 

 

Off

+12dB

 

 

 

 

 

 

 

 

 

 

 

40 150

60 1.2k

min max

 

 

min max

60 1.2k

40 150

 

 

 

 

 

Low-Pass

High-Pass

 

 

 

 

High-Pass

Low-Pass

HP | Off | LP

 

 

 

 

 

 

 

RIGHT

CH 2 (Right) CH 4 (Right)

Input Sens.

Filter Frequency (Hz)

Filter Mode

Filter Frequency (Hz)

Input Sens.

Bass Boost

Off

+12dB

HP | Off | LP

Filter Mode

16

JL Audio

17

INSTALLATION NOTES:

INSTALLATION NOTES:

18

JL Audio

19