Sorry if it was mentioned before but for those of us that want to wear BTR5 around their neck I think Baseus has a perfect solution. Didn't see similar solutions from other manufacturers but stumbled upon this by accident while looking for a lanyard for my BTR5. Not sure if I can post links to...

From Google translate: source: http://bbs.fiio.net/note/showNoteContent.do?id=201804201612337828588 also there is BT firmware update (2.2 beta) here: http://bbs.fiio.net/note/showNoteContent.do?id=201803271059044086605 with the change log:

If anyone is interested in longer cables - I just tested Q5 with Lightning to USB Camera Adapter connected to Ugreen MicroUSB OTG adapter with USB A to A (also from Ugreen) cable. It works (including DSD), Q5 light is solid (so no charging indication) so it shouldn't drain the iDevice battery.

RTFM :D You press the next track button to switch between line in modes - green is analog, yellow is coax, purple is optical.

I was getting crackling even at 44.1 (that is why I RMA'd it) it looks like Q5 is very picky about optical sources. I hope I get an replacement - they had my Q5 for few weeks now and I miss it every day (they said Q5 is out of stock and it can take up to a month so I assume they are just waiting...

According to the specs: http://www.fiio.net/en/products/83/parameters optical input supports up to 96KHz/24bit

The issue is that the volume in Q5 is tied to the reading of the potentiometer position and the BT module is not general purpose BT chip, it's a media client oriented one. Not to mention that implementation of the BT module in Q5 is far from typical. Making it possible to change volume via BT...

Why? RM1 controls the transport - just pair it with your source (like your phone) and use it. :D

Corrupted audio over Optical Input.

Just get an Lightning extension cable (there are a few options on Amazon and AliExpress) and use it with the included adapter. Micro USB extensions are cheaper but will probably won't work as Q5 requires pin 5 of the MicroUSB connector to be grounded or connected do the Accessory line of the...

If I remember correctly AM5 has an output relay - it disconnects the output while the amp is powering up to prevent a loud pop that could potentially damage the headphones. Clicks you hear are normal.

The way I understand it is: If FiiO ever decides to update the Bluetooth firmware you will have to use this port to update it. To update the Q5 internal firmware you will need to use the bottom port.

You can change this setting (up to 30mins or 0 to disable auto poweroff) from the iOS app.

Thanks for taking your time to check. :)

Yeap, COAX is flawless on mine also. Tested all I got including some DSD tracks using D2P from X7. Ordered a $8 Optical to Coax converter but it will be a month until it get's here.