Tying aux in directly to the stock amp (TDA7560) - diyAudio
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Old 7th July 2013, 05:11 PM   #1
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Default Tying aux in directly to the stock amp (TDA7560)

Like many people on the web, I'm working on adding an aux in line to my car's stereo (2008 Nissan Xterra). Unlike most of the how to websites, my stereo doesn't have any built in external inputs (CD changer...). The only ports are the audio out and antenna in harnesses. I've looked at tapping into the ribbon coming from the CD to the main PCB but don't see how to tap into it. I'm now looking at tying directly into the HU's amp. The amp is a TDA7560.

Currently, I am successful in playing audio out of the car speakers (via 1/8 inch into the amp) with my phones mp3 player. The problem though is that it is severally distorted. It is hard to even recognize the song. The way I connected to the amp is by placing the L/R signal from the 1/8 inch jack into pins 1IN and 3IN of the amp. Pin diagram can be found here.

Is my problem the fact that the Amp is expecting four inputs but I'm giving it only two? If so, what are the four inputs it is expecting? Is it possible to send an analog stereo signal directly into this type of amp?

Thanks for the help, I'm new to this stuff and look forward to learning from you all.
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Old 8th July 2013, 04:51 PM   #2
rickcl is online now rickcl  United States
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I think what you have is an impedance missmatch. You are taking a low impedance (maybe 8 ohms or so) and driving your amp with it's 80k input impedance. Have you ever tried one of the converters that takes the amp output signals and convert to RCAs? They have a transformer that does the impedance conversion. Its not the best because of the signal loss and you tacking on the distortion of the HU output amp.

To try and install an output on your HU is going to be tough without a schematic.

Line-Out Converters & Hi-Lo Adapters at Sonic Electronix
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