Do a battery runtime test. This is the listed spec: Playback Time about 12hours (Standard : FLAC, 16bit, 44.1kHz, Vol.50, LCD Off, Normal Gain) Uses a 16 ohm headphone to run the test and see if you can get at least 10hrs out of it. If you still get much less, then Ill suggest you contact...

Skip the E6, perhaps find something a decade more advanced.

I am not an Apple Music user so this could be wrong - there is a difference between a streaming app ability to stream Hi-res music directly to a smartphone's hardware (aka native playback) and its ability to output Hi-res music over USB. The latter will require the app has an USB output driver...

Not really. IEM profiles are supported since the original W1 / W2 series. It is under 'SDF' setting.

Definitely do an update, there are quite a few bugs in the older firmware.

My first impression is here: https://www.head-fi.org/threads/the-tws-neckband-bt-cable-adapter-thread.920709/post-18086829

Moondrop EVO is in, so here is some first impression: 1) Case is big, bigger than iFi Go Pod. 2) BT connection is not particularly stable, even when running on SBC mode. Likely an issue of early firmware and can be remedied by firmware update. 3) Shallow 2 pins don't fit my deeper 2 pins...

Last I checked I think only iPhone with Type C port can powered the KA17 desktop mode without external power.

Should get mine in less than a week, will share my impression then.

Moondrop released EVO, priced around US$70 or so.

If you recognized these, you are certified old fart in the forum.

Digital filter is like seasoning, everyone has his/her own preference. You can only find what 'taste' best for you by trying them all out by yourself.

You are correct that it is a hardware limitation. FC6 uses NJU72315 volume control chip and it offers 0 to -62dB control via 2dB steps, meaning it is 31 steps total.

Perhaps I should be more clear - I am not saying it isn't possible to up-convert the power rail above +5V / -5V, but the higher it goes, the more difficult it will be. to keep the circuit in reasonable size/complexity to maintain a clean power. The way FiiO partially solves this issue is by...

Voltage swing determine how loud the headphone can get. However, don't forget KA17, even when powered by external Type C source, still operates on a 5V USB power rail. Generally the quickest way is to flip the USB power rail into +5V / -5V rail which that amp section can work to generate a...