I have the QB9 and am very happy with it. I did'nt listen to many other DACs at all. I bought based on a review and audition. I liked it's simplicity, plug and play, so I am not paying for facilities I don't need. It is fed by a modified Mac Mini, using Audivarna and gives me a detailed and on the warm side of musical, sound. There are 2 filters, I have only used the listen one so far.
In the UK, I think it is overpriced, but I managed to get an ex demo model, £1000 off. So I am bvery pleased with the sound, compact size and builsd quality
In the UK, I think it is overpriced, but I managed to get an ex demo model, £1000 off. So I am bvery pleased with the sound, compact size and builsd quality