Horacio, I understand where you're coming from. I have the Tranquility DAC, but I can't give you a meaningful comparison because I have not heard the QB-9 in my system. However, you can always audition the Tranquility in your home with money back guarantee from the manufacturer if you don't like it. Can't say the same for QB-9. As for dB Audio Labs not disclosing details on the DAC, I can see both sides of the fence. Many audiophiles are caught up on the latest DAC chip, asynchroneous USB, oversampling, high rez, etc, thinking the newer the better. I have heard the latest of the latest, but most of the time I'm disappointed with the new technologies. Many will not even consider a DAC if it doesn't have asynchoneous USB or latest DAC chip. I say let your ears be the judge and not the manufacturer's hype.