Definitely agree, we use multiple Motu's a lot. and they do the job just fine - tho the RME stuff is
great as well.
Just a note on synchronisation - we all use sigma-delta converters these days and they, especially
with the older designs, can have significant latencies. Moreover, in terms of your overall system,
these can effectively be variable. This is because there is usually a dependency on when the chip
comes out of reset on power-up. Within a single multichannel box there's no real problem as all the
converters, even if they're on separate chips, see the same reset time (unless someone's really
screwed up the design) but with multiple boxes this is much more difficult to ensure unless it is
embedded in the communications protocol somehow.
Dave (slightly hung-over after the post-conference drinks...)
On 26/03/2012 00:12, Miguel Negrao wrote:
A 24/03/2012, às 05:58, Eric Benjamin escreveu:
currently thinking of using PCI or PCI express cards
Any time that there are multiple devices the chances of having them be offset in
time increases dramatically. I've really had a lot of bad experiences, both
with multiple PCI audio devices and with multiple external ADAT devices. I'm
thinking of one system I saw a few years ago that had three ADAT cards in the
computer to get 24 channels of output. In that system I occasionally saw
offsets of greater than a millisecond! But more recently I've seen a system
with four MOTU 24I/O devices for 96 channels of output, and that system had
perfect synchronization between devices.
If it’s the system that I’m thinking about, not only that, but also
synchronization with another computer with another 4 MOTU sound cards, making a
total of 192 channels. :-)
best,
Miguel Negrão
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