I do believe the "WISA" aquarium pump is considered the best,in this application.Not cheap,and it had a distributor who modded it,for audio purposes.I wish I could give you more input here.Also,some compressors used for dentist drills(don't laugh)have been used with superb,high pressure results,on arms like the Air Tangent.I had two friends who did this,and once one got past the humor,it was a sonic revelation.
I'd still go with a nice new WISA,which should be available commercially.
good luck!
I'd still go with a nice new WISA,which should be available commercially.
good luck!