resonance

Edition XS, Fiio TF1 Pro Topping DX3 Pro+ I have had three pairs of PM Headphones at home until know and each of them displayed some sort of resonating noise in either the chassis or the driver itself. I use this tone generator and with all three i found frequencies that agitate some sort of...

Hello, Some of you might remember the controversial UB52 review where @amirm found a nasty resonance, and ended the review there, for which he received some flak.. Some argued it is just the bad unit he received, and that we should not base ourselves on it, asking for Amir to test another one...