Need help with audio install

I have a question that I hope someone will be able to give me an easy answer to. Sorry for the long post but I have no choice but to explain from beginning.

I have my carputer audio output connected to the auxiliary input of my HU. Currently I use the carputer for GPS only until I have it loaded with audio. So I am still using the HU to play regular CD or listen to the radio. The problem I have is that I can only choose to listen to GPS or CD/radio but not both at the same time.
I bought a KH style relay that can switch between two “4 wire” sources. I plan to connect the audio from carputer into the input terminals of relay and have one of the outputs connected to my HU and the other output to a simple speaker. The negative 12 volt of the HU will activate the relay and route GPS to the speaker if I am listening to radio/CD, and switch it back to HU if I am not using the radio/cd on the HU.

My question is that if the audio quality is going to suffer because I will be passing through the relay. Will I have interference, noise or cross talk because of that? How can I prevent that from happening? shielding? Any insight would be greatly appreciated.

A relay is a switch. Mount the relay(s) in an isolated place, and it should make no audible difference.

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Originally Posted by David88vert

A relay is a switch. Mount the relay(s) in an isolated place, and it should make no audible difference.

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That is what I was thinking too. But I had seen many posts regarding shielding the audio lines and I thought if those wires are going to be next to power lines within the body of the relay without any shielding then it might cause problems. Thanks for the input.

You shouldn't run into any problems.

Thank you!