[brianlo622]

You will be amazed at how much better your OEM system sound just by swapping out the headunit.. I think both the bespoke and the non-bespoke units have pretty unflat and distorted signal in the first place.. my pioneer receiver hooked up to the factory amp was a vast improvement.

With the OEM plus package, the midbass are maintained, only the tweets are upgraded, and of course there is the subwoofer.. I could imagine that the DSP plays a big role in improving sound quality as well. Mind you, none of the components from the OEM plus are really "high quality parts", but the packaged price is hard to beat for a measurable improvement.