JL Audio 300/2 User Manual download pdf (Page 8)

JL AUDIO 300/2 15

“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 RCA

cables from the amplifier prior to this test).The frequency

used should be in the range that is to amplified by the

amplifier (example: 50 Hz for a sub bass application or

1 kHz for a full range / high-pass application). A steady

voltage should be present at the output of the RCA cables.

If you are receiving a sufficient voltage (between 0.2 and 8.0-

volts), check to ensure that the speaker wires are making a

good connection with the metal inside the amplifier. The

connectors are designed to accept up to an 8 AWG wire. If

you are using significantly smaller wire (14 AWG or smaller),

you may have difficulty making an adequate connection. In

this case, you may find it necessary to “fold” the wire over

once (or twice!) so as to make a solid connection. Make

sure to strip the wire to allow for a sufficient connection

with the input or output of the amplifier.

Check the output of the amplifier. Using the procedure explained in

the previous check item (after plugging the RCA 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.

5 volts 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 above.

“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 amplifier terminal.

Check the RCA connectors to ensure that both the center pin and

the outer shield are making good contact with the input jacks

on the amplifier.

“HOW DO I PROPERLY SET THE INPUT SENSITIVITY ON MY AMPLIFIER”

Please refer to Appendix B (page 13) to set the input sensitivity for

maximum, low-distortion output.

“MY AMPLIFIER DOESN’T TURN ON”

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 “+12V”

wire to the “Remote” terminal to see if the amplifier turns on.

If this does not work, proceed to the next step.

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 the fuse-holder.

“I GET A DISTORTED / ATTENUATED SOUND COMING OUT OF THE SPEAKER(S)”

Check the speaker wires for a possible short, either between the

positive and negative or between a speaker lead and the

vehicle’s chassis ground. If a short is present you will

experience distorted and/or attenuated output.The

“Low Ω” light may also illuminate in this situation. It may be

helpful to disconnect the speaker wires from the amplifier

and use a different set of wires connected to a test speaker.

Check the nominal load impedance to verify that each channel

of the amplifier is driving a load between 1.5 - 4Ω

(3 - 8Ω bridged).

Check the input signal and input signal cables to make sure signal is

present at the “Amplifier Input Section” and the cables are

not pinched or loose. It may be helpful to try a different set of

cables and/or a different signal source to be sure.

“MY AMPLIFIER SHUTS OFF ONCE IN A WHILE, USUALLY AT HIGHER VOLUMES”

Check your voltage source and grounding point.The R.I.P.S. power

supply is rated to operate with source voltages between

11 - 14.5V. Shutdown problems at higher levels can occur

when the charging system voltage drops below 10 volts.These

dips can be of very short duration making them extremely

difficult to detect with a common DC voltmeter.To ensure

proper voltage, inspect all wiring and termination points. It is

also a good idea to improve the vehicle’s factory ground wire

and termination point. Grounding problems are the leading

cause of mis-diagnosed amplifier failures.

14 JL AUDIO 300/2

APPENDIX C: TROUBLE SHOOTING

1 2 3 4 5 6 7 8 9 10 11

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JL Audio 300/2 User Manual Page 8

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