Hi I recently acquired a secondhand A65+. I connect it to my MA RS5 and CD73. The speakers are biwired with MA speaker cable. I find that when there is no source playing, the speakers would make small white/hissing noise from the tweeters. It's not very loud but I never used to hear it on my Denon 2106. Is this the normal behaviour of this amp? Is there anything I can do to rectify this issue or it needs a trip back to Arcam? Thanks for the advise.