DDC TOP poll: what TOP do you use with your Blue impeller DDC

[skinnee]

Maybe I am more hard of hearing than I thought (deaf as a post), but once my test loop is bled I can't discern any difference in noise from one top to another on the same pump.

[scamps]

Maybe I am more hard of hearing than I thought (deaf as a post), but once my test loop is bled I can't discern any difference in noise from one top to another on the same pump.

I was part of punkrock / rock´n´roll bands for 2 decades and hear nothing over 10 KHz (and 2-10 KHz only bad) - but I do still hear the differences of my Laing-tops

poor Skinnee Probably you should better use your laboratory equipment to check the differences