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With digital audio, upgrading the head unit does nothing for sound quality.

This might be true if you're using a source containing it's own DAC, such as plugging an iPhone's analog headset output into the aux input of the head unit.

But if you're expecting your head unit to do the conversion, such as may be the case with satellite radio, isn't the DAC in the head unit going to play a role in the output?

And even if you're supplying the head unit with an analog source via your iPhone or what have you, do all head units have a clean, unprocessed path from the aux input to the outputs?

And don't some head units take convert their analog aux input to digital, run it through processing (at the very least to implement volume control digitally) and then convert it back to analog again?

Unless I'm wrong I suspect head unit choice could make a difference. I agree that amp and speakers is the way to go, but is it right to say that head units don't make any difference?

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