Linking a new DAC to my iMac causes lots of pops and crackles

I've just bought and installed an Arcam rDAC and rWave to improve the quality of the music files I play through iTunes. Connection is via wireless USB.
Whilst the quality of the music has improved, it is now accompanied by a whole series of pops and crackles, making it unlistenable.
I initially raised this with Arcam, who tell me there is a known problem with iMacs that they and other DAC manufacturers have encountered and they currently don't know of any fixes. I'm planning to test whether my son's MacBook Air exhibits the same problems to see if I can eliminate the DAC as a problem.
Can anyone throw any light on this for a largely naive technophobe (i.e. no answers involving complex IT procedures please). What is causing this and is there anything you can suggest that will improve matters? Computer is 2.16 GHz iMac Intel Core 2 Duo using OSX 10.6.8.

CCTM wrote:
Hi
mbriscoe wrote:
planning on buying a new iMac (21.5, 8GB, 2.9Ghz). My question is, will it be powerful enough for running various sound libraries in logic?
I was thinking about upgrading it to 16GB, but the guy in the store said that 8Gb was more than enough.
Definitely get 16G of RAM
You may also want to consider getting the 3.1GHz quad i7 processor instead of the i5
That guy at the store didn't know what running  Logic and (large) 3rd party sample libraries means. CCTM does, and he's right. Get at least 16 GB, and the 3.1 GHz i7 (if you can).

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