I use both a Wisa pump and the stock ET pump in tandem and run it into a homemade surge tank(a five gallon plastic gas can with aquarium stuffing inside). From there i use an inline filter to my 2.5. Sounds great and have had no problems with it. I keep both air pumps under a table in the corner of my listening room and after a while you become conditioned to the low droning of the pumps,no big shakes.
