air pumps: which makes the least noise?

[W Hung <wjhung2@yahoo.com>]

I'm looking at purchasing another air pump and want
one that's strong yet quiet.

Has anyone every owned the old supra series and the
newer tetratec deep water series. They look similar in
design. Which one is louder?

Also, if someone could compare noise levels of air
pumps that would be great. I currently own a Rena 50,
Rena 300, Tetratec AP50(loud) as well as the old
series Whisper 100. The quietest air pump I've ever
owned was a Penn Plax Silencer 50, but those are no
longer made. 

So here is my ranking for air pump noise. This is not
scientific: (the unacceptably loud level starts at the
Tetratec AP50)

Silent-------Good------Pretty Good-------Loud-----> 
PPlax Silencer
     Whisper 100
        Rena 50
                Rena 300
                                  Tetra AP50
                                          Challenger  

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