Tip & How-To about Car Audio & Video

How To Diagnose No Sound Output From Your Vehicle Stereo

  1. Check each Subwoofer or Speaker that isn’t working for continuity - At the subwoofer or speaker, one at a time, test the terminals for Continuity using your Digital Multi-Meter; if your DMM doesn't have a Continuity test, use the Resistance, or Ohms, test and check for Resistance in the Subwoofer Coil (be sure to disconnect the subwoofer wiring before performing these tests).
  2. If they test out good, hook the wires back up and test the terminals at the terminal cup or at the Amp hookup if you didn’t use a terminal, don't hook it up to the amp yet. Sometimes the wiring inside the box can be a problem if it has come loose, or isn't making a great connection.
  3. If you have a Sub or multiple Subs with Dual Voice Coils, or multiple Subs with Single Voice Coils, make sure your wiring is correct by checking here: http://www.the12volt.com/caraudio/woofer_configurations.asp
  4. Make sure there are no Hi-Pass filters, crossovers, or multi Channel switches enabled.
  5. Replace your RCA cable/s with known working RCA cable/s from the Source/Head Unit to the Amplifier/s.
  6. Check your Head Unit settings; make sure the Bass is turned up and/or the Subwoofer setting is turned On.
  7. If you are still getting no output, try plugging in an MP3 player or CD player using a headphone to RCA adaptor and check for sound output. If there is still no output, your Amplifier outputs are probably burned out.

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1 Answer

I have an Altec Lansing 340 speaker system that is not working.


There could be a defect in the connector. Check both sides for continuity.

Jan 03, 2015 | Altec Lansing Audio Players & Recorders

1 Answer

NO BASS!!


1) Check the Subwoofer for continuity - At the subwoofer, one at a time, test the terminals for Continuity using your Digital Multi-Meter; if your DMM doesn't have a Continuity test, use the Resistance, or Ohms, test and check for Resistance in the Subwoofer Coil (be sure to disconnect the subwoofer wiring before performing these tests).
2) If they test out good, hook the wires back up and test the terminals at the terminal cup or at the Amp hookup if you didn’t use a terminal, don't hook it up to the amp yet. Sometimes the wiring inside the box can be a problem if it has come loose, or isn't making a great connection.
3) If you have a Sub or multiple Subs with Dual Voice Coils, or multiple Subs with Single Voice Coils, make sure your wiring is correct by checking here:
http://www.the12volt.com/caraudio/woofer_configurations.asp
4) Make sure there are no Hi-Pass filters, crossovers, or multi Channel switches enabled.
5) Replace your RCA cable/s with known working RCA cable/s from the Source/Head Unit to the Amplifier/s.
6) Check your Head Unit settings; make sure the Bass is turned up and/or the Subwoofer setting is turned On.
7) If you are still getting no or low output, try plugging in an MP3 player or CD player using a headphone to RCA adaptor and check for sound output. If there is still no or low output, your Amplifier outputs are probably burned out.

Jul 18, 2010 | Jl Audio 300/2 Car Audio Amplifier

1 Answer

Power, but no sound


take an ohm meter and remove wires from speaker...put meter in the ohms position...you will put a lead on each of the terminals of the speaker...you should have a reading of 2, 4, 8 ohms....you may also try to use the continuity test, same, but there will be a beep ....this basically ensures that the coil running through the speaker is still good, as one piece, otherwise it will get no good reading and this is usually from blowing the speaker or sudden high bass sounds....

Aug 09, 2009 | Sony SA-WM500 Subwoofer

1 Answer

My KEF 20B subwoofer has stopped working since i accidently plugged it into my amp with the sub switched on, it made a quiet thud and now makes no sound at all, is there anything i can do with it? the LED on the front does stil light up tho.


Probably blew the speaker or the crossover coil. You can check it with both with an ohm meter to check for continuity. Disconnect the speaker and/or coil for the rest of the box before testing.

Jul 12, 2009 | KEF Audio 20B Speaker

1 Answer

Somethings Crazy


It's surprising to see one fail after such a long time, but most likely either one of the tinsel leads (between the speaker terminals and the voice coil) has broken, or the voice coil itself has burned out. You should be able to see the tinsel leads; if one has broken away from the terminal you may be able to solder it back into place. If it's broken on the speaker cone side, it's unlikely that you'd be able to solder it without damaging the cone. A break in the voice coil won't be visible; to test for it, check for continuity between the two terminals. Unfortunately, it's probably going to be easier to replace the subs than repair them.

Jun 23, 2007 | Rockford Fosgate RFP3212 Car Subwoofer

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