DVCPRO HD firewire output audio issue

Hi, having a few problems with DVCPRO HD audio
Here is the situation
Shoot DVCPRO HD 1080i50 using P2 camera (HPX2100).
Edit on a 1080i50 DVCPRO HD timeline using an intel Macbook pro.
When monitoring the audio on the mac all is good.
Crackles appear on the audio when the timeline is played back to a P2 camera or deck (both set to DVCPRO HD 1080i50)
This has been the case with several Macbook Pros (Leopard and Tiger) and a Mac Pro tower.
When using the Mac Pro tower, playout was also fine when using the internal AJA HD-SDI card.
I think I know that this is a firewire issue, but I am now a bit lost as what to do about it.
Anybody had the same problem or know any answers.
Thanks
David Rees.

The only way to get your timeline to tape via firewire is if your sequence is a DVCPRO HD sequence. If it is Uncompressed 10-bit, the signal will not go down the firewire cable...only out via a Decklink card.
We are recording onto a standard 66 minute DVCPro Tape and the deck is(supposed to be) upscaling the SD footage to DVCPro HD 1080i.
Uhm...no. The deck can record a DVCPRO HD signal that is being fed it via firewire, or an HD signal that is being fed to it via a capture card. It is the job of the CARD to convert the footage, not the deck. If the card has that option. My Decklink HD card doesn't. But I do not have the Extreme card, so I don't know what options it has.
http://www.decklink.com/products/multibridge/
It mentions that it can DOWNCONVERT from HD to SD, which mine can...but nothing about upconverting SD to HD in real time. I don't think there is a card out there that can do that...output SD to upconvert to HD. That is something you have to do in your timeline, or via a Terranex box at a post facility.
In other words...I don't think you can do what you are trying to do.
Shane

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