Since 3 days I hear craklings sometimes . It looks like a saturation on music fast transitions : forte, micro noises behind voices , laughs etc. It occurs exclusively on one radio station ( « FranceMusique « in France , classical music) . This radio is known for its sound quality, less compressed than the others.
I own an Aries femto with 6.1.1 firmware. Same problems with aries outputs (aes) or USB and with another Dac. The problem desappears if I use a MacBook pro instead of the aries.