I am slowly making the switch to high resolution audio on all of our devices at home and portable. The X5 can read FLAC files off of a USB stick perfectly and the quality is obvious and fantastic. Eventually, I am going to retire all of our iPods and replace them with FLAC, MQA, or other high-res capable devices.
I have not been happy with the sound in the coupenut car. I recently set the gain on the amp to absolute minimum, and that helped tremendouosly. But the real issue is at the source: the iPod. CDs sounded much nicer. To prepare for high-res, I changed out the CD changer-iPod adapter I had previously installed and I replaced it with a Grom USB3. The advantage of the Grom is it has multiple inputs. So for now, I can continue to run an iPod through it, but eventually I can run a straight 3.5mm headphone output from a high res device. This means the DACs in the high res device do the work, not the Grom, not an iPod. Also, the Grom unit has an optional Bluetooth adapter which is nice for phone calls and also streaming audio in a pinch.
I did but the Grom BMW trunk cable harness. I didn't need a huge harness, but some extra slack is nice to relieve cable strain.
Grom USB3 = $149.99
Aux in and 5V USB charging cable = $14.99
Grom Bluetooth adapter = $49.99
Total cost of this mod = $214.97r
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