I have a call into Axiom Tech. Too much going on to sit around waiting for a call back..... Maybe someone has a trick up their sleeve for me to try in the meantime.

One of the twins I unboxed yesterday is making this click-click-click noise. Noticed it when I initiated the Denon's white noise test tone to balance channel levels. I have dual sub output adjustment. Same spot, same cable as the V2 500's these V4's are replacing. Tried turning it off, back on a couple times. Connections are good.

When the clicking occurs, I can see a color change occurring inside the amp cover. Must be an LED. It turns from blue to red.

Can't refer to the instructions (uhhhh, it happens!!), as there were none in the boxes.