I recently did a blind test between my Qutest and Mojo. Both were feed by an iMac and they feed my GS-X Mini driving Ether 2s.
iMac to Qutest via Supra Cable and iMac to Mojo via Amazon basic.
Qutest to mini via benchmark RCA to XLRM adaptor cables and Mojo to mini via Audioquest evergreen 3.5 to RCA.
Mojo powered from internal battery and Qutest from a external battery.
Qutest output voltage set to match Mojos line out mode.
I had my 10 year-old flip the input switch on the Mini and mark the position. I listen to a mix of about 5 songs for about two hours.
I made subjective notes on sound quality and which DAC I thought I was listening to. I was no better than flipping a coin at determining the DAC and my subjective notes made no sense as I consistently determined that I liked more whichever DAC I thought was the Qutest.
I sold the Qutest, as that is the only rationale thing to do. But, I am clearly checking this thread out as I am clearly not happy listening to only a $500 DAC.
Not sure how much this adds to the conversation or if is just a cheaper form of therapy than pressing the buy button on a new DAC.