Does your DDC pump make this noise ?

you can't hear the high pitched whistle like a hard drive spinning up but the pump continues to make it until he turns on the fan and then it's drowned out. ?
 
You said you can hear the Humm where as i can hear an annoying whistle.

I didn't point it out to see if people mention it without being prompted.
 
And people say the DDC pump is quiet .

I've not heard the new blue ones but the 3 or 4 i've heard of the old black and orange/brown ones all make the same annoying noise yet people still recommend the DDC for silent systems ?
 
The 3 or 4 DDCs i've heard all make the same whistle even when suspended from elastic or mounted on rubber pump mounts and people say i'm nutz and thats the first time i've been able to post the sound i can hear from DDC pumps.

The sound reminds me of of electrical noise you get from the copper windings on the rotor , But maybe i shouldn't be so surprised as i can often hear monitors Screeching when the refresh rate is not set correctly and friends say they can not hear it.
 
I'm not sure but it's looking that way unless there is some differences between the ones made in the EU and the ones made in the USA ? I never checked country of origin on the ones i've heard apart from one i remember was marked EU Laing Hungary.
 
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