Hi there, looking for a little help / advice please, I have a Yamaha amp (crx-n5600) running some Yamaha powered monitors (hs 50m) when I power the speakers up there is a humming / buzzing until I power up the amp then that goes away but also when I’m playing vinyl through it plays nice and clear but now and again when I lift the needle from the record I’m getting a really high pitched squeal / tone until I mute then unmute. Any ideas please??