I think it depends on the unit. My oem Chrysler u-connect 8.4 unit seems to have a pretty good usb input. My Pioneer 1700 double din had a great usb input. The usb input on a cheap JVC Arsenal unit I had was terrible. Had a grainy sound.
OEM U-Connect 8.4a, JL Fix 82, c-dsp 6x8, JL XD800/8, Soundstream TN1200.1, stock rears controlled properly by minidsp 2x4 with rear fill plug-in, ID15, SB Acoustics SB17NRXC35-4, Seas Neo Aluminum...HASTE MAKES WASTE
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I've had good luck with AUX inputs in the past -- both OEM and aftermarket. My new car ('16 Chevy SS) is lacking one, and I really miss it. The '14s & '15s had one, but it was dropped in '16. Just my luck. Bluetooth is a total beatdown of inconsistency, latency, and signal compression. And the USB connection wants to take complete control of my iPhone, meaning I'm relegated to using the ridiculously slow and horribly-designed UI on the head-unit display. I'd much prefer to use the UI on the phone directly -- it may not be perfect, but it's vastly superior to the mess is MyLink. And if I don't like it, there are countless 3rd party music apps out there with a vast array of different features and UIs.
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