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Hey folks.. I’m messing with a little car project (mixing a custom head-unit / DSP idea into a Honda that I’m already poking at), and I’m eyeing the https://www.kasuo.com/product/tas5756mdcar-datasheet-price-pdf/ for the audio side. It’s a digital-in amp (I²S/TDM), runs from ~4.5–26V, and looks handy for a compact in-car amp.

Before I wire it into the car I wanted to check with people who’ve done similar automotive hacks, a few real concerns from my side:

Cars are full of switching noise. I plan to feed the TAS5756M from a regulated buck (not straight off the ignition feed) and add a TVS + LC on the input. Anyone had success with a simple LC + ferrite + big electrolytic + 0.1µF ceramic decoupling near the amp? I don’t want the amp to inject noise into ECU lines or pick up ignition spikes. My plan: star ground, keep audio/AMP wiring physically away from ignition coils and injector harnesses, and add ferrites on speaker leads. Thoughts?

Since I’ll be feeding digital audio (I²S) from a small SBC/DSP, I know clock jitter is a thing. Best practice seems to be keep the I²S cable very short, share clock domains if possible, and avoid routing I²S near noisy power traces. Anyone found a safe “sweet spot” for routing in the dash area? Any extra protections you always add (fuse placement, polarity protection, speaker-short protection) before bolting into a car harness?

Short, practical tips are perfect, I’ll bench-test first, but want to avoid upsetting the car’s electronics when I install it.

Cheers and thanks in advance for any advice.