Question about JBL BP600.1 Car Audio Amplifier

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No Output from amp, green LED on

The amp is receiving power, i tested it with my VOM. My RCA's are brand new, and i tested them. They are plugged in the right places. My Green LED is on. The Amp used to work then just stopped giving me any output. I tested my subs, and they are good too. Can i repair this?

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Re: No Output from amp, green LED on

Are you absolutely certain your subs are in good shape? have you put a meter on them and measured the ohms as you depress the cone [causing the cone to move up and down on the pole of the magnet? do the ohms stay constant? go up to infinity[ suggesting an open] or go to zero or close to zero [ suggestting a short] both of these conditions will result in a zero or a very limited output from your amplifier, while still showing a green status light, if or when a full short or open occurs on the subs, a fault led will become lit, and whet that means is that u have fried the a bit more testing with your vom....and good luck or try another speaker for testing purposes...

Posted on Jun 30, 2007

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My amp goes into protection mode when i turn on my car. It gets hot too. I had 2 kicker 12" l5's and blew the subs with that amp, could i just have a simple problem with the amp? What are all my options?

Protection LED on, no output? Amplifi er is very hot = thermal protection is engaged. Test for proper
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No or low output? Check the balance control on source unit Check the RCA (or speaker input) and
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1 Answer

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Hello maydude01,

The Boss OL5KD does not have a volume control. It has an "Input Level" adjustment which is used to match the output from your head unit preamp output to the amp. It is the first rotary control just to the right of the input jacks.

If you have no sound at all, I'd suspect that something is incorrectly connected or there is no input to the amp. First make sure that the amp power light (green LED) is coming on when you turn on the receiver and that the protection light (red LED) stays off. Then check all of your wiring, especially the RCA output cables.

Initially set the controls like this: MASTER/SLAVE switch in MASTER position (left). INPUT SENSITIVITY 2v-8v (right). INPUT LEVEL, SUBSONIC FILTER, BASS BOOST, and LOW PASS FILTER; midrange. PHASE SHIFT "0" (left). Leave the remote level control disconnected.

After you've checked all wiring and initially set the switches and controls, turn the receiver on to about 3/4 volume. Now adjust the INPUT LEVEL to the left just until you begin to hear distortion, then turn it back right just a little. Adjust the other controls for best sound. Plug in the remote level control and make sure that it adjusts the bass up and down. You're finished!

If there's still no output from the unit after checking all of the wiring, either the unit is defective, it's not getting an input from the receiver, or the sub(s) are defective.

Hope this helps.

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Hello southernbike,

With a 5-channel amp (stereo L/R front, stereo L/R rear, and subwoofer) you only need the two pair of stereo inputs.

You do not say which brand and model of amp you have, but most have an output configuration similar to the Alpine shown in this link. Connect the front and rear RCA's from your receiver, your vehicle speakers to the respective output terminals, and your subwoofer to the 5th channel terminals.

Hope this helps.

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1 Answer

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Hello codyr25,

First of all, you need to isolate what is causing the problem. No output (sound from the sub) could be a defect in the 1) Wiring, 2) Head unit, 3) Speaker(s), or 4) The amp itself.

Start to systematically eliminate the possible causes. Connect your subs to a known good system. If they work, it's got to be something else. Check the RCA cables from your head unit to the amp. Check the speaker wiring. Check the amp on-board fuses.

Make sure that you have output from the head unit. With multiple RCA jacks, it's possible to plug your cables into an input rather than an output (in the dark, behind the dash). If you have more than 1 set of preamp outs, try another set.

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I Had the Same Problem I just unplugged my amplifier changed the fuse, also i had a fuse in the battery cable and changed that, unconnected the RCA wires and plugged them back in and then put new fuses in and plugged everything back into the amplifier and it worked again. If that doesnt work get back to me i will try to help you.

Jan 09, 2009 | MTX RT2200 Car Audio Amplifier

1 Answer

No power output

Set the meter to AC volts and measure the AC voltage on the RCA cables where they plug into the amplifier. The black meter leat will go on the shield ground of the RCA cable. The red lead on the center conductor. You may have to turn the volume up to get a reading on the meter. At high volume, you should read at least one volt but the actual voltage will vary due to the audio signal. If you get no voltage on the RCAs, measure the AC voltage on the input to the LOC. Let me know what you find.

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