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Audio Systems/Mod old stereo CD to accept MP3 player inputs


I have an old Magnadyne LS7600CD stereo system in my RV

My goal is to disable the CD player and instead input audio from my MP3 player. This has standard headphone out which of course will also work as "Aux In" for any rental car I have driven lately.

I opened the unit, cut the coax audio line between the CD board and the main board, and spliced in the red/white/black wires from an old headphone extension cord. I then plugged my MP3 player into the female end of the extension cord.

When I set the unit to CD it plays audio from the MP3 player! It sounds great, but very very quiet.

Not sure what the problem is. According to, a headphone output is nearly the same as a line output.

As an experiment I put a little Radio Shack "mini amplifier" in between. It puts 200 mW into a 16 ohm load, i.e. it is for driving a speaker. This did make the setup louder, but not loud enough. When I turned it up, the sound became very distorted. I assume this is because it is a high gain amp.

This mod is very close to working. Is there any chance the headphone extension cord is attenuating the signal? (It is a about 10 feet long.)

Or do I need a low gain amp? Any help will be greatly appreciated. Thank you.

I will put it all back to factory and do the aux input after the FM tuner, there is a am FM preamp and after that there is a preamp chip before the main amplifier ic chip you have to connect your new audio source after the second preamp chip and you have to turn off the power or ground on that chip that way there is no FM signal but your volume and eq controls will keep working

you can use mouser electronics or digikey to get a pdf of the chips with the info and what each pin are,
good luck  

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Ernesto R


Please year and model of the vehicle, I need all the details, I'm a car electronics installer with 24 years of experience. I'am very familiar with installations of in-dash head units,factory head units, factory car audio, hands-free phone kits, auxiliary audio inputs and iPod iPhone interface integration bluetooth and Car Alarms tracking devices security systems remote start If you need any help with your factory stereo, or how to add auxiliary audio or listen to your iPod IPhone android in your vehicle I currently have a MECP Master Installation Technician certification. My answers are based on my experience in vehicles and my knowledge of automotive electronics I don't put much emphasis on brand names; you won't often find me putting down a brand or pushing one on, dont send me a list of what brands i like better sorry i can not help you with vehicles that are not in the u.s.a also video and security


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