QuestionI have a pioneer car stereo/cd/mp3 unit (DEH-3050UB)on my Harley Davidson. The front speaker leads are wired to two punch speakers in the fairing. The rear speaker leads are currently not used.
Question: What materials or equipment do I need to wire these rear leads to a 3.5mm stereo plug to input the stereo signal into my intercom system (MIT-100) which has an input jack for Mp3. Thank you for your time.
AnswerThere are a couple of ways, the only problem is it won't be stereo and it won't be very loud with one method or it's possible to damage the intercom system the other way.
Method 1:
All high end stereos have an 'uncommon' ground between speakers. Connecting the two grounds will damage the stereo and this is what's required to achieve a stereo signal.
Using one channel and spliting it for mono left and right will work.
The device required is a LOC (Line-Out Converter) that connects to a set of speaker wires and reduces the signal for Line-level use.
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Because of such reduction in power by the LOC you may only barely hear any music.
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Method 2:
Some electronics knowledge required.
Using a 10K linear potentiometer between the speaker wires and the intercom system, turn the radio all the way up. Then start out at 10K ohms and slowly back it down so the music gets louder on the intercom system to the point just before distortion*. Disconnect. Measure the resistance of the potentiometer at that point and find a resistor the next size closest size up or down from what you measured with a 1/2 watt rating.
Connect this resistor in series between the stereo and intercom system.
*If the potentiomer is allowed to go all the way to 0 ohms or even close to it, this will send the full power of the radio to the intercom system and will most like destroy parts.
All modificatons should be perfomed by a professional.
