that recording is not to my taste at all
which D4 is that, the original ? (should explain why we did not wish to sell it)
- the present ones don't make that noise, different pitch and lower volume
the DDC was/is not isolated (something is resonating)
no exp with those Eheim models
jd - your wakeup call here
any 3600 RPM pump not isolated from the chassis will 'buzz', and no high head pump of this type can be "dead silent"; but appropriately isolated they can be inaudible
also in a fanless case in a 20dBA environment ?? - no data but doubtful
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