Good stereo setup for an A body?

jbc426 said
Eliminate the head unit entirely and spend that money on a DSP(Digital Signal Processor) with built in amp instead.

Instead, download Tidal onto your smart phone for CD quality and above music streamed directly to the DSP and then to your speakers.

If you conceal the speakers, no one will know you have a very nice system by looking at the interior of your car.
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This is why I posted! Getting suggestions and ideas! Thank you! I am not familiar with DSPs or what they even look like. But I like researching things and this will give me a great opportunity to so!

P.S. What do you think a setup (like the one you described) might cost (ball park)? Thanks again!