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

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.

I have a Sil-Air compressor that came with a Kuzma Airline I bought a month and a half ago.

It's very quiet and probably could run in the same room as your equipment. I chose to have it running in an adjacent room, however.

Chris

Ckniker, I use the Kuzma Airline too and also the Sil-Air Compressor. Nevertheless one has to run the Sil Air Compressor in another room (I do so too)because every 8 minutes you hear a sharp sound (zzsch) when the air echausts. People told me that the Jun-Air Troll/Minor 3-4 should be even better than the Sil Air.

Even pumps marketed as whisper quiet typically have >30db noise. I don't know what pressure/flow rate the ET arm requires, but but if you are getting by with a low pressure pump, there is no reason to add the complexity, condensation issues, and expense of compressors. You might try the pump in an insulated & vented wood box. I cut noise of my 30db Rena 400 air pump in half by encasing the pump in a carapace of soft modeling clay, and placing pump and flow tank inside a plywood box insulated with several layers of cut-up acoustic ceiling tiles.

I used a rena pump (aquarium pump) to float my platter on my maplenoll. Its a pretty low pressure unit. it is however very quiet and if you can get away with the low pressure, is a great unit. Now that I went with the large platter 90 lbs, i need more pressure than the rena could generate. it develops about 4 to 6 psig.