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I have an aqua culture for a 30 gallon which has two air tubes which is ultra quiet--I can barely hear it when I'm right next to it
my aqua culture for my little ten gallon is relatively noisy---I can hear it going if I'm in the same room
And absolutely positively do not get an AirTech---when I had it set up I could hear it 2 rooms away
IME the bigger the less noisy they are which is a big factor for me.
If you mean somehting like a bowl, Marineland (or Penn-Plax) makes the Small World Filter that comes with an air pump, tubing, and a filter cartridge of floss and carbon. It is made especially for tanks/bowls under 2 gallons.