What's the quietest hang on skimmer?

[Dogmai]

Hi

Currently I have the BakPak 2 skimmer, which my better half finds annoyingly loud. I'm looking to replace it, and I'm interested to know other people's experiences with other skimmers. To put it bluntly, I'm looking for an absolutely silent/near silent skimmer.. if one does exist. I have a 50g reef tank.

Also, if anyone has any suggestions for dampening the sound of skimmers.. that would also be welcomed. I have already extended the air intake hose, wihch helped a little bit.

Thanks,

Mike