JL 500/1 Amplifier whine(not alternator whine) - diyAudio
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Old 19th February 2011, 05:01 PM   #1
gsxtasy is offline gsxtasy  United States
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Default JL 500/1 Amplifier whine(not alternator whine)

Alright, so I just picked up a used JL 500/1 supposedly in working condition, but never verified it. Click the image to open in full size. So I pull out my working alpine amp, and put in the JL, hook it up and the power light illuminates like it is supposed to. However, after it has power for a few seconds there is a high pitched whine coming from the amp itself, and it has no output to the sub. The whine is still there with the RCA's unplugged, and if I unplug/plug the RCA's in, the sub makes a thud. I have the amp set to the 'baseline' settings JL suggests.

This is in a dodge ram with a stock head unit.

I don't know a whole lot about car audio, pretty much just the basics of how things are supposed to be hooked up and work. So I don't really know what to try to fix this or did I get screwed and this amp is just toast? I tried a different ground, same thing. Any ideas? Thank you in advance!

-Aaron
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Old 19th February 2011, 05:18 PM   #2
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With the amp powered up (no RCAs or speakers connected), what is the DC voltage on the positive and negative speaker terminals? Place the black meter probe on the amplifier's ground terminal. Place the red meter probe on the point where you need to measure the voltage.
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Old 19th February 2011, 05:38 PM   #3
gsxtasy is offline gsxtasy  United States
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They are both right at 40.3 v.
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Old 19th February 2011, 07:01 PM   #4
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How are you getting signal from the head unit?
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Old 19th February 2011, 09:59 PM   #5
gsxtasy is offline gsxtasy  United States
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I'm using a line-out converter.
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Old 19th February 2011, 10:14 PM   #6
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What make/model converter?
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Old 19th February 2011, 10:28 PM   #7
gsxtasy is offline gsxtasy  United States
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Had to go double check, it's a Stinger SGN 11.
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Old 19th February 2011, 11:35 PM   #8
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Did you try grounding the brown wire?

If that doesn't allow the amp to produce audio, unplug the RCAs from the amp and measure the DC voltage on the input RCA shields on the amp and on the RCA cables that were plugged into the amp. Place the black meter probe on the amplifier's ground terminal. Place the red meter probe on the point where you need to measure the voltage.
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Old 20th February 2011, 12:02 AM   #9
gsxtasy is offline gsxtasy  United States
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I'm pretty sure it was hooked up to ground through the deck, but I ground it to chassis just now, not sure if it matters, and still no audio.

The actual RCAs read 5.92v, the amp read .593v for red and .618 for black.

Last edited by gsxtasy; 20th February 2011 at 12:15 AM.
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Old 20th February 2011, 03:57 AM   #10
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I think there may be a problem with the converter. It states that it blocks DC but it doesn't appear to be doing so.
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