Thank you for your thoughts here.
N802 are the speakers i have. Circa 2000.
I don't play the system that loud really, just enough to feel some bass frequencies.
I to normally have the amplifier gain at full and use the mixer to adjust the volume.
That being said I can definitely hear the noise floor quite audibly, when there is no signal incoming. However the mixer has quite a noticeable noise presence, maybe because it belonged to a record shop so it has seen some use.
Appreciate the feedback