I've read and read several threads.. a couple of my old school amps have balanced inputs.. example, 4 rca inputs for 2 channel amps? What's this used for?



The old school excelon deck I had also had balanced outputs 10v unbalanced, 20v balanced? Why would I need that high of voltage?



Just looking to clear some stuff up.

 

A car is horrendous electrical environment. The entire system is full of electrical noise. If your audio lines have (e.g.) 10mV of noise on a 1V signal, that's relatively much more than 10mV on a 20V signal. The S/N ratio goes up because the S part is so much bigger.



Balanced lines also (depending on implementation) can have the ability to reject noise, which makes for even higher S/N ratios.



A car is a horrendous audio environment. You will not hear the difference in balanced or single-ended if the components in question are decent quality to begin with. If what you have sounds okay, run with it.