The quattro only does two outputs at 24bit 96khz, with two outs at 44100khz at 16 bit I get really nice, loud, clean output that works really well with terminatorX (after adding an extra buffer to its settings), and works great with pd in a default install. On Tue, 27 May 2003, Mark Knecht wrote: > > > > Another thing about the quattro is that even the windows drivers will > > not allow you to record and playback on all 4 channels at one time. > > > > You can use > > > > 4 in, 2 out 48khz 24 bit > > 2 in, 4 out > > 2 in, 2 out 94 khz 24 bit > > > > I think I am running up against this with my latest attempts. It may be > > that the quattro cannot do all 8 channels because of a hardware switch > > maybe for power consumption or something. They do run awfully hot and I > > can imagine that it would be possible to melt something if their is too > > much power running through them. > > > > USB 1.0/1.1 is built on a 12Mb/Sec physical layer. > > 96000 * 24-bits * 4-channels = 9.216Mb/S if I did the calculations > correctly. > > I think that's probably more than USB can really handle. When I worked for a > company that did USB hardware, we found in many PCs (at that time - > 1996-1999) that most USB implementations would really do much more than > about 2Mb/Sec reliably. The newer implementations are much better, but these > numbers bring you up to 75% bus efficiency. Even 1394 doesn't get much > beyond that and it uses much larger packet sizes to get some of that. > > >
