what is the quietest air pump for my ET-2 ?

Strange it worked for me
http://forum.audiogon.com/cgi-bin/fr.pl?vaslt&1097358102&read&keyw&zzsimon%20yorke

otherwise search for Simon Yorke on System and then pick the system called Northern Lights.

ok - got it now. Big machine but looks good. The question is are you able to run it the same room . I will ask Nortern Lights. Thanks Perrew

Im not sure but I think he might have some valuable inputs.

I have utilized several compressors for my maplenoll. I now use a JUNAIR compressor that is pretty quiet but i could hear it if it was in the same room. I put it in a closet and i can not hear it. Junair also sells a compressor that is encased in a sound insulated case that you can not hear but its a little pricey. Not sure of the pressure a et2 takes so depending on the pressure, there might be many alternatives. If you look on my maplenoll string, there are several references to compressors particularly WISA superquiet and others.

Oilmanmojo, yes this is a good recommendation. A friend of mine told me about the Troll from Junair and I ordered one yesterday. It should be very quiet. Nevertheless I do think I have to build a sound insulated case.