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

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.

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.