Anyone know if LPGT2 runs some kind of DSP under the hood? Basically wanting to understand if it's bit perfect.
I was looking into this a couple of weeks ago and read this on Zeppelin & Co. Not sure if it fully answers your question, but at least some of it...
https://zeppelinandco.com/products/lotoo-gt2
Lotoo have yet another chance to showcase their DSP code mastery, bringing AKM's AK4191-AK4499EXEQ DAC ecosystem in the Paw Gold Touch (LPGT) 2 music player to new heights.
After taking the original Paw Gold Touch as far as they could with constant Digital Signal Processing evolution, Lotoo acknowledge the strides digital audio has made in the six years since, bringing its flagship up to 2024 standards.
Knowing what AKM's own AK4191 delta-sigma modulator is capable of, and Lotoo's own track record of proprietary software upgrades down the years, LPGT2 is good to go for a decade on its own on the digital front. It's backed up by a 4.4mm output capable of producing 1,000mW balanced power per channel.
The generation of pristine I2S is the ultimate goal for LPGT2's DSP. But even the best digital trickery in the world needs a hardware platform sufficiently capable to execute software. Enter Asahi Kasei Microdevices (AKM)’s resurgent flagship DACs.
These Japanese giants, back on their feet with a clean slate, started afresh expanding the basic footprint of a single DAC chip IC into three separate parts – to similarly multiply capabilities by a factor of three.
AKM’s AK4191EQ is the brains of the operation, receiving pristine I2S clocking and data from LPGT2's Blackfin. Aboard, AK4191EQ’s delta-sigma modulator takes advantage of its expanded, dedicated, silicone footprint to lay claim to the title of the first chip IC working at seven bits.
These seven single-bit modulators flow on into LPGT2's dual AK4499EXEQ DACs, one for each channel and built with a single purpose in mind: to turn the interpolated, noise-shaped, digital data it receives into the most precise analog waveform possible afforded by its large footprint.
Native playback is also supported: By disabling the XRC function, you can choose to play audio at its original sample rate without any upsampling. All filters can be disabled as well.
No regrets there. Such a great DAP. 
You're def not going to get the slam from M1 that you'll find in WP900, but as an all rounder, M1 is a more balanced offering (plus, I never actually used WP900 in a portable context...!). Let me know your thoughts if you get a pair. Sounds fantastic with GT2, of course, as does everything.
