No I don't have one. I'll use my pro 10ch card to get started with active crossover, as I did with the OB speaker. But if it works out, I'd want to stick with the Sabre DACs. I don't think that a USB hiface and a firewire pro card would sync perfectly. I think there needs to be a common clock. Not sure how much reclocking hiface does, that's what I need to learn. Probably the easy way won't work.