Originally Posted by jack d
I could be wrong but I thought you could only use ambisonics on a disc that is specifically mastered for ambisonics of which there are very few.

You are correct, but I could always use it with no problems on any CD in the past. The crackling noise has only arrived since I installed the HD621.

Home: BDP-103,G61R, HD621, Quad520f, 2xInnersound amps, 3xQuad ESL-63s, 2xJL Fathom F112 V1 subs, 2x Gradient SW63 subs.
iFi Zen Stream , Audeze LCDi4.