I have a buddy I met here on A-gon who likes his Aesthetix Calypso so I thought I'd take a chance on one. If any of you who own the Ayre V-5xe and have had reservations (as I did) about hum issues with a Calypso, this problem has been solved. Thanks to Charles post above, I sent mine back for the 'M' upgrade. End result: no hum, no noise, no problems. The Calypso is just breaking in, but it seems to be a great match with the Ayre V-5xe and Ayre C-5xe. I'm happy as can be.