hifi engine

AI Modulus L1 Power Supply noise

I recently bought an AI L1 and whilst it sounds great there's a buzz from the power supply box. The buzz is not distracting whilst music is playing but I wonder if anyone out there has a similar experience? I guess I'm looking for confirmation that it's OK and that "they all sound like that"! The noise doesn't seem to influence the 'listening experience' so do I just need to 'get over myself' and enjoy?
Thanks - David.