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Originally Posted by cotdt
Are there ways to get existing quiet pumps to become more silent?
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Yes.
Reduce vibration transmission (mount on foam or suspend, use soft silicone hoses - note that different foams will do a better/worse job depending on frequency, amplitude and
axis of output)
Reduce sound transmission through air (install sound damping material in case or mount pump in sound damped case - note that damping must be 1/2 wavelength thick to be effective - go read up at SCPR or maybe search for my posts here as I'm sure I've "gone on" about that aspect)
Reduce sound re-radiation (add weight to sheet metal walls - there are "car audio" products (dynamat) for this. Some folks also contact-cement on rubber tiles or industrial carpet
(semi advanced) modify pump's vibrational output - firmly attach pump to a weighted base, then vibrationally isolate the pump/base unit. The idea is to drop the resonant frequency below the audio range. Note that pump loading (in the sense of "head" or resistance it's working against can also change vibration. If higher resistance nets you lower noise, you might want to go for a more restrictive block rather than just clamp the hose, of course...
(semi advanced) change pump axis to match foam's (or suspension's) best ability to damp vibration, route hoses for the same reason (in soft silicone, at least, a push-pull vibration is better transmitted than a side-to-side one) May not be possible/applicable
That's all I can think of - but I'm sure there are others...