JL Audio J2250.1 owner manual My amplifier turns on, but there is no output

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“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-pass application). A steady, sufficient voltage (between 0.2 and 8.0-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.

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Contents 250W Monoblock Subwoofer Amplifier Installation Applications Protect Your HearingSerial Number Stupid Mistakes to Avoid Planning Your InstallationSafety Considerations Cooling Efficiency ConsiderationsEnjoy the fruits of your labor with your favorite music Fuse Requirements Power ConnectionsAmplifier InputS REMote turn-OnMplifier nputs PREAmP Outputs LP Filter CroSSOVER ControlRemote Level Control Bass BOost ControlSpeaker Output Status Indicator Lights Protection Circuitry Servicing your AmplifierJL Audio Technical Support Nine-Step Procedure Appendix aNecessary Equipment Amplifier Section Appendix b J2-250.1 Specifications General SpecificationsDimensions LxWxH Input SectionMy amplifier doesn’t turn on My amplifier turns on, but there is no output INSTALLATION NOTES Bass Boost INSTALLATION NOTES INSTALLATION NOTES International Warranties Limited Warranty Amplifiers USAIf you need service on your JL Audio product JL Audio, Inc