FW problem with Apogee Duet, Yamaha monitors, and external FW800 HD...

Recently purchased an Apogee Duet and Logic Express 8. Love it so far but there's a cracking noise coming out of the Yamaha monitors when I turn on the external HD via FW800. The Duet is connected via FW400.
It'll be nice to solve this issue. The digital/cracking noise is annoying. It's almost unworkable. Additionally, I use the external FW800 as my recording drive so it's crucial. I guess the FW bus is overloaded. Is an express/34 card the only option? If so, any recommendations.
Besides this, the Duet sounds awesome w/out the FW800 HD plugged in.
Thanks, mT.

I'm having the same issue -- lots of crackly digital noise coming through my studio monitors (but not through the headphones). The noise, I find, is particularly loud when the 48v is on. Is that the case with you? I initially discovered the issue while trying to record with an AKG C 451 B condenser. When the mic was getting phantom via the Duet, I was getting digital crackling. However, when I put a preamp between the condenser and the Duet (in this case a UA Solo/610) and had the preamp supply the 48v, the crackling was gone. So: is this an issue with the FW or an issue with the Duet's phantom power?
(I'm using the Duet with Logic Pro 8)

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