I had a BMW CP600 in my original Z4MC. It was pretty cool - connected to the CD changer cable, supports an SD card, similar navigating & display to the Grom unit. But it didn't SOUND good. MP3 tracks played via the CD player sounded very noticeably better at the same bitrate than what came through the CP600. This is the little bugger I'm talking about...
https://www.maintronic.de/en/shop/cp...d-karte-detail
Anyways.. my "new" Z4MC will be here soon and I'm trying to figure out what I'm going to do for tunes. My preference is just to load up a USB stick and slap it in the boot next to a Grom and be done with it. So my question for you guys who have a Grom - how does the USB output sound? Is it equally clean & clear as what you get from the CD player?