Question about Kenwood KDC-MP735U CD Player

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Whistling when i start my truck, a high-pitch whistle comes out of my front tweeters. i have a factory bose system and i upgraded the headunit to the kenwood kdc-mp735u and a PAC interface, c2r-gm24. the bose has a built in amp. the whistle seems to be in-tune with the rpm's, like it goes up and down with the rpm's. what is causing the problem and what is the solution?

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Re: whistling

Hi, A couple of possible cause: 1. alternator whine - installing a filter (capacitor/inductor) in series with the B+ line to all the electronics units; 2. grounding - possibly insufficient grounding considering that you gave different brands and are interconnected; check/improve grounding, It is also helpful to install a unit chassis mounted grounding to all the units going to a common ground lug; 3. audio line level input wire too close to a B+ line - move further apart or improve shielding of signal wire; 4. loose battery connection - (although unlikely) worth to check; 5. power on line (sometimes color yellow sometimes blue) - needs filtering (a possibility only but worth to check by connecting to mains B+ instead of via ignition switch. of course this will defeat ignition switch activation of unit) A reminder, pls make sure your voltages match up chances are your electronic units are 12 volts and your truck (big truck?) might be, just might be 24. It is another issue when your truck is 24 and your units are 12, If so check your 24 to 12 DC to DC converter. Hope this gives you some idea and work out for you. pls post again how things turn up. Good luck and kind regards.

Posted on Aug 03, 2007

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