I've been frustrated with my 5000nex because when my iPhone 6 is connected over usb1 I noticed the audio quality is not very good. Pioneer tech support recommended to check the s.rtrv setting but it was on mode 1. Bluetooth sounds amazing compared to usb1 so I disabled CarPlay to see what would happen. All of a sudden the usb1 audio quality was just as good as Bluetooth. I'm disappointed that I have to disable CarPlay but I would rather have the superior sound quality.
I wanted to post this in case someone else noticed this issue.