Firewire + external audio hardware problem (6-pin)

Hi,
I'm also having problems with the 9-pin firewire port on my recently bought 13" Macbook Pro. I have a Hercules 16/12 External Soundcard with 6-pin firewire which works perfectly on my white Macbook with 6-pin firewire port.
On the Macbook Pro:
Yesterday the audio played normally (f.e. iTunes) for a few seconds and then the device crashed, no sound anymore till I restart the device. Today it looked like it worked, it doesn't crash and kills the sound, but there is a constant crackle noise on the audio... I tried different sample-rates, resetting the SMC (I read that somewhere on here), I still have to check if the problem could be a faulty 9-pin to 6-pin firewire cable I bought, but I don't think that's the problem.
There is nothing wrong with the audio device, because it still functions correct on the older Macbook with the 6-pin firewire port.
Anyone out there with other suggestions of what might solve this problem?
Thanks.

The original FireWire specification, FireWire 400 (1394a), supported a maximum distance between devices of 4.5 meters (cable length). FireWire 800 supports a maximum distance between devices of 100 meters (cable length).
Unibrain says they can exceed the FW 400 4.5 meter cable length because their cables not only achieve a very controlled 110 Ohm impedance but also provide high performance for skew, attenuation and crosstalk. These latest features were not prerequisites when the first IEEE-1394/1395 specification was issued, at the time limiting the maximum cable length to 4.5 meters. Therefore they can now secure safe operation of their Firewire 400 cable lengths up to 10 meters.

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