Fosi Audio K5 Pro Gaming DAC Headphone Amplifier

These add tremendous value to planar headphones. Total sound immersion, a world of value

Hello, I am very satisfied with the Fosi Audio K5 Pro.

I have using this device mainly as DAC with RCA out to ZA3 and sometimes as headphone DAC.

Good - Build quality is pretty good in general, but the bass and treble nobs are slightly off centre. Sound profile is quite neutral, with bass and treble adjustments you could tailor to your liking. It is features rich with pretty much all the outputs for a DAC except Bluetooth, which is usually not great with the basic codec.
Not so good - the gain is quite low for RCA out, you will need to push the DAC to 3 o'clock just to get to normal listening volume, it might be too low for anyone if looking to crank things up. USB input doesn't sound as good as the other inputs.
In Summary - if you are looking for good value and reasonably good sounding DAC + headphone DAC then this could be a good option to consider.

I like the device, it does what it is meant to do, but...
The front power on led is very bright so I turn the device off at night when not in use. Every time I power it back on I get a USB device descriptor failed error and it is not detected untill I power cycle the device again. Quite annoying.

if you turn the amp up all the way you may hear a bit of static, although this is very very faint and you will not hear it while playing any sound or music