K712…. Love mine!

Was just an FYI… I agree on the Nak. A friends son bought an older IS300 and the stock stereo system totally rocks, especially for the era and system complexity.

All the recent vehicles are Mark Levinson branded Harman QLS/QLI systems.

Pretty easy in most applications. They blow all the time.

FLAC

https://www.bestcaraudio.com/another-comparison-of-digital-audio-file-formats/

Very simple. If the phase and frequency response of both channels are nearly identical, the system will image well. That’s the fundamental of “stereo”.

Anything from KEF or Revel would be a much better investment. Both companies have invested in creating transducers with distortion-reducing technologies like shorting rings and copper caps.

They have neither technology nor quality. Pick something that sounds good instead.

Speakers.

When you buy audio equipment based on appearance or perceived performance based on price.