Thread: How to put auxiliary behind the radio for unavi

Hi folks! I'm new to this forum, but a long-time regular over on gencoupe.com forums ...

Anyway, I bought a uNavi myself, and tried to go this route of splicing into the AUX L and R input lines on the back of the factory radio.....

Unfortunately, I can't really say that it's worked as well for me as I had hoped. I don't seem to get the same sound quality out of my iPod playing through the original factory iPod connection cable that I had before? I think the issue is that the uNavi AND the iPod are both trying to inject their signals down the same input lines at the same time, and the signals are shorting each other out? I do get audio from both devices, but neither one seems capable of playing anything resembling "CD quality" anymore. I'd liken the sound to an old cassette tape quality, at best.

I did some more reading up on this, and it seems like other people who had similar issues trying to splice into their car stereo inputs to get two devices to share them wound up building little "mixer boxes" that simply added resistors in-line with each of the input jacks they mounted on the box. I'm not sure I really understand electronics theory enough to get quite why this works, but my guess is that without resistors there, both signals being output wind up overloading the input of the stereo - harming the sound quality?