Manual JL Audio 1200 (page 7 of 13) (English)

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12 | JL Audio - 1200/1v3 Owner’s Manual

The amber indicator will also light when a

short-circuit is detected in the speaker wiring

(this can be a short between the positive and

negative speaker wires or between either

speaker wire and the vehicle chassis).

4) “Low V” (Blue): lights to indicate any

dip in supply voltage below 8 volts. The

blue LED will remain lit longer than the

dip duration to better alert the user to the

problem. This will be accompanied by a

shutdown of the amplifier (green LED

will shut off) and a total loss of output.

Once the voltage rises above 9 volts, the

amplifier will turn itself on. Because voltage

dips occur in rapid succession, the typical

behavior will be a cycling of the amplifier

on and off, accompanied by flashing of the

“Low V” blue LED. If this is happening in

your system, you will need to investigate

the cause of the voltage problem. This could

be a bad ground on the amplifier, battery

or alternator OR a faulty battery/charging

system OR a problem with a fuse holder or

wire connection.

If you are unsure as to the cause of the

problem, please consult your JL Audio dealer or a

qualified automotive electrical specialist.

Keep in mind that any large amplifier, like

the 1200/1v3, places a very heavy demand on a

vehicle’s charging system when operated at its

limits. Vehicles with weak charging systems may

need to be serviced and/or upgraded to provide

ample current to a system including a 1200/1v3.

There is only one condition that will shut down

an undamaged 1200/1v3 completely… If battery

voltage drops below 10 volts, the entire amplifier

will shut itself off. The green “Power” indicator

on the top of the amplifier will turn off when this

occurs. The amplifier will turn back on when

voltage climbs back above 10 volts. This may

happen in a rapid cycle when bass-heavy program

material causes a weak charging system to dip

below 10 volts momentarily. If this is happening

in your system, have your charging system

inspected to make sure it is working properly.

For information on troubleshooting this

amplifier, refer to Appendix E (page 20).

SERVICING YOUR JL AUDIO 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

IMPORTANT

Speaker loads below 1.5Ω nominal are not

recommended and may cause the amplifier

output to distort excessively.

Speaker connections to the 1200/1v3 are

straightforward and take place at the far right

of the front panel. You will notice that there

are two “+” positive connections and two “–”

negative connections. This is to facilitate multiple

speaker wiring. The two positive and two negative

connections are connected in parallel inside

the amplifier. Connecting two speakers, each to

one set of positive and negative terminals, will

result in a parallel speaker connection. If only

connecting one pair of speaker wires, it is not

necessary to use both sets of connections.

Do not chassis ground any speakers connected

to this or any other JLAudio amplifier. Doing so

will cause the amplifier to go into protection and

mute the output.

The 1200/1v3’s speaker connectors are

designed to accept 12 AWG – 8 AWG wire.

To connect the speaker wires to the amplifier,

first back out the set screws on the top of the

amplifier, using the supplied 2.5 mm hex

wrench. Strip 1/2 inch (12 mm) of insulation

from each wire and insert the bare wire end

into the receptacles on the front panel of the

amplifier, seating them firmly so that no bare

wire is exposed. While holding each wire in place,

tighten each set screw firmly, taking care not to

strip the head of the screw and making sure that

the wire is firmly gripped by the set screw.

IMPORTANT

Do NOT attempt to “bridge” two 1200/1v3’s or

combine their output to a single load in any

manner. Doing so will damage the amplifier(s).

IMPORTANT

Before reconnecting the battery ground and

turning the system on, verify that all control

settings on the amplifier are set according to

the needs of the system.

OUTPUT POLARITY SWITCH

Depending on the distance relationship

of the mid-bass speakers and the subwoofers

in a system, it can be desirable to reverse

the polarity of the subwoofer system in

order to produce a better transition between

subwoofer and mid-bass speaker output.

The “Output Polarity” switch allows you

to peform this polarity inversion without

removing any wires. Simply flip the switch

from the “Normal” to the “Reversed” position.

Experiment with this switch to determine

which polarity produces the best overall

bass performance in your system, listening

in particular to the mid-bass smoothness

and impact to make your determination.

+12VDC Ground Remote

Low/High

STATUS INDICATOR LIGHTS /

PROTECTION CIRCUITRY

There are three status indicator lights on the

top of the amplifier. These are as follows:

1) “ Power” (Green): lights to indicate that the

amplifier is turned on and operating normally.

2) “ Thermal” (Red): lights to indicate that

the amplifier has exceeded its safe operating

temperature, putting the amplifier into a self-

protection mode, which reduces the power

output of the amplifier. The red light will shut

off and the amplifier will return to normal,

full-power operating mode if the heat sink

temperature drops back to a safe level.

3) “Low Ω” (Amber): lights to indicate that the

impedance of the speaker load connected

to the amplifier is lower than the optimum

impedance load range for the amplifier. When

this light is on, a protection circuit engages

and reduces the power output of the amplifier.

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JL Audio 1200 Manual

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