The K7 has a six-stage audio circuit with truly balanced analog and digital sections, which helps to reduce crosstalk and reproduce music faithfully and noiselessly.
Balanced amplification couldn’t sound better
Using the same THX AAA 788+ amplifiers as the K9 Pro, the K7 is capable of outputting 560mW into a 300Ω load at 1% distortion, and 200mW into a 32Ω load at 1% distortion. This ensures both low and high impedance headphones are fully powered with optimal musicality.
Dual AK4493SEQ D/A chips
The left and right channels are each equipped with an efficient high-performance AK4493SEQ D/A chip. These 32-bit D/A chips support 768kHz PCM and DSD512, ideal for high-resolution audio source playback.
Please note there is also a newer variant that has bluetooth if that is what you are after
https://addictedtoaudio.com.au/products/fiio-k7-bt-bluetooth…