got today this little „gem“, the mentioned AK4113 Digital Receiver Board + LCD1602 Screen SPDIF Optical/Coaxia
„powered“ it by a simple usb to 5V „converter“ but all i got at the end was 96khz/24bit via the hdmi-audio-extractor and also via the coax/toslink-output of the Sony BDP-S7200 and the Philips BDP9700/12->
tried all different settings in the system-menus from the both player (auto,bitstream,pcm etc.,etc.)->no success..also via the hdmi-extractor the max was 96/24..
but don´t know if the AK4113 detects (and displays) it accordingly; but the 3 manual settings on the extractor were „pass“,“2ch stereo“ and „5.1“..with the „pass“ and „2ch stereo“ i got only 48/24 max..has to „evaluate“ it more..
UPDATE 1: seems like these special 4k-hdmi-switch/audio-extractor only supports audio up to 96/24..so, be careful in choosing the right one !!
another thing was that i wanted originally connect the AK4113 via I2S (to bypass the spdif-conversion) to an ES9038Q2M, but absolutely no „lock“-light..thought about it a lot and i guess (at the moment) the I2S-line (-cables) are too long (ca.30cm)..(read it sometimes ago->“the i2s-line(-cables) has to be short as possible (5-10cm)..“
UPDATE 2: curiously, i´ve got the „lock“-light (and its playing) with the „blue“ ES9038Q2M; so, again, there is often a compability-problem with different devices..
greets for now + much more to come.. 😉