[nst7]

Yes, if you're doing it that way. However, if you wanted to have the 11R clocked by the Mbox, then you might need another cable going the other way. I could be wrong though. You might still be able to do it with just the one cable.

As to why you might want to clock off the Mbox - since it's a newer converter and clock design, it might slightly improve the sound of the 11R.

Since those cables are so cheap on amazon, I would just get a second one just to have handy.

You can buy cheap brand spidf cables, but since the price on those is so good, I figure you might as well go with Monster quality.