Anyone here use a digital audio player?
Those that don’t know, basically a much more advanced version of an iPod touch (for example) For much higher audio resolution files.
I’m not sure how many Audiophiles (if any) exist on this forum and was just curious.
It all depends, you are talking about a hardware product, A DIY hardware solution or a software solution.
You already have a pretty good hardware.
But if you want to go for DIY solution you may want to explore VS1053 with a better MCU like PIC32 or one of the ARM bases MCUs, with ATMega based arduino solution it will be good as long as you are playing MP3 files. For flac you 'll need a faster mcu.
You can also explore STA013/020 like chips but only if you have lot of spare time for hobbies and propensity for programming and soldering.
There is another way and that is raspberry Pi based hardware/software solution, some of them are extremely good.
Then there is VLC based option already discussed by one member.
Once you have a playing solution you could refine your output with commercially available solutions or again go the DIY way with a sound refiner like mine OPA627+BUF634 or LME49720+BUF634 then split it with an active crossover network separating the highs and the lows and the mids and then send it to the speakers through a class A, class D, power Mosfet based power amp or gain-clone. For DIY LM3886 or TDA7293 are still the best.
I prefer a simple stereo setup with no cross over sound going to two normal speaker set through a self build class A AMPs or Class D having low THD, just a simple mixer of two channels, a low pass filter build around bessel character with LME49720 and then fed to Yamaha YST-SW-800 subwoofer pair or a DXS18-800 pair.