@Another User said:
on the money side, you would spend at least $600 more for each Mac Mini.
Even the ProFire - overkill since it has four lightpipes - lists for $500. It's going to sell for $400 on the street.
So that's an exaggeration. And to put a fine point on it, having to deal with 8U of boxes is inconsequential if the alternative is mixing problems created by the limitation of only having two outputs.
Nonetheless, I'm personally not at all convinced that an army of Mac Minis is the ideal solution for VSL. It is for Jerome's boss, but it wouldn't be for me (although it might be for a couple of slaves). Even before the audio interface issue, I'd rather put in more RAM and get more out each machine. You can put together Windows machines that work really well and possibly network audio and MIDI between them with FX-Teleport -which I haven't tried, but it's really the way to do it if it works - for considerably less. There's some of your 8U and money spent on interfaces back right there.
Don't get me wrong - I think the Mac Mini is a clever machine for many reasons, and I'm thinking about replacing one of my Windows machines with one. And there are always other factors, for example I'd find it much easier to maintain an army of Macs than Windows machines - partly because of my limited knowledge of Windows troubleshooting and partly because Macs simply are easier to deal with when things go wrong (unless you're cm, in which case it doesn't matter). But I wouldn't personally buy several of them specifically for VSL, at least not this generation.