Best way to disconnect firewire audio interface (power down apogee duet)

This may seem like a really naive question, but I am brand new to firewire as well as Macs, so forgive me.
It doesn't seem healthy to just leave my Apogee Duet powered via the firewire connection when I'm not using it for a length of time (ie - doing graphics rather than music). With any and all software that had been using it closed down, and my system prefs for audio back to non-duet input/output for audio, can the firewire cable to it just be disconnected, cutting power to it? Or should I power down the computer, then disconnect, and power back up?
Uh, and I guess I'm posting this question here because it seems more likely for there to be a number of Duet and/or audio firewire interface people here...
Thanks,
Apple

hi,
you can leave it active.
won't damage anything.
in fact, it might stop damage.
only thing i find is, if i switch the mac off totally, i get a ground loop (or lack of)occurring to my pwr amp/monitors.
you could yank the FW cable but it'll produce the loop (hum).
if your are using small; speakers, you might not hear this, because it's low, but it's still there.
DR9.

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