I had the Bifrost and it was a bottleneck in my system. It's not a bad DAC, it's just not a great one.Granted, it is not the best DAC in the world - i.e. right out of the box - but if you want to make it "soar" - it is possible...
1. bypass the USB input - that is truly this little DAC's biggest "bottleneck"
- I installed a v-link192 USB-SPDIF converter - what a difference!!!
2. treat it to a great power cable - the internal power supply is a bit small and limits the performance of audio circuitry, so installing a great power cable will do wonders for the dynamics and imaging
3. treat it to great interconnects - this will improve details and clarity
4. if it's an older Bifrost (like mine) - you can upgrade it to either the most recent AK4490 version or even the multibit option
I went with the more affordable AK4490 upgrade and my Bifrost has never sounded so good.
Granted, I could have spent the money spent on cables and upgrades on a new DAC, but I wanted to see exactly just how good the Bifrost could be - i.e. when allowed to.
It really is quite special - once it's tricked out :-)
Cheers