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The main speaker is hissing quietly at all times when the power is plugged in. Is connected properly and the phone is working correctly other than this issue - any suggestions, or is this a manufacturers fault?

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Altec Lansing VS4121 speakers stopped working for no reason????


I had a similar set and they drove me mad because they hissed when they were switched off. I bought a pair of Bowers and Wilkins MM1 instead. Fabulous.

If you want yours fixed you would have to take them to an electronics engineer or return them.

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Make sure that your speaker cables are connected properly and that the amp is not in protection mode. Also make sure that the amp ground wire is connected solidly to the vehicle chassis in a paint-free location. If you do all of that and it still doesn't work, make sure the head unit lead is connected correctly to the amp (these should be RCA cables).

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The headphones socket is on the preamp stage - it works so the problem must be after the pre-amp.
Do you get any sound at all from the speakers (hiss or perhaps a click) when you turn it on?
If yes it is an amplifier problem.
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  • Loudspeaker burnt out - this can be tested by connecting another speaker across the terminals of the built in speaker.
  • The headphone jack socket automatically disconnects the loudspeaker when phones are plugged in - it could be that the contact in the headphone jack socket is bent and not re-making contact when the headphones are unplugged.

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I noticed the ticking noise stops if the rear wireless unit is powered on after the main receiver. If the main receiver is on first, then the rear powered up, there is no ticking. This is pretty retarded though since I want to leave my rear receiver on all the time and power down the main unit when not in use.

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