Low hum when converting analog to imovie

I'm trying to convert from Sony Handycam Hi8 analog to iMovie, using a Canopus ADVC-300. I get a low hum when I connect which gets worse when I press play. The hum is not on the original tape. Not sure what's causing this, but may be the cables? Here's what I'm using:
Out of Handycam: Svideo plus a mini-A/V output with red and white RCA at other end.
Out of convertor: firewire
I'd appreciate any advice. Thanks.

If the hum is not on the original tape, then it is probably caused by one of these issues. Check them out 1 by 1:
1 - a/v cable plug(s) not completely seated - check at the camera & at the ADVC
2 - camera audio out not set correctly (check the camcorder menus for the audio out setting ... usually you can toggle between headphone and a/v ... the wrong setting will generate hum ... you may need to try both settings)
3 - a/v cable is bad - try another cable
4 - ground loop ... three possible causes ...
• if you are running your ADVC and camcorder both on A/C power. Try running your camera just on battery, no A/C plugged in
• if you are running the ADVC on its power brick, disconnect the brick. The ADVC should still work via power from the FW cable - provided you are using the ADVC's 6-pin FW connector to connect it to your Mac
• both of the above
5 - some other audio device connected to your Mac at the same time as your ADVC
6 - ADVC is bad

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