Active sub won't switch from stand-by to active
I have a Pioneer s-21w at the moment, been using it in combination with a Sony STR-DH540 for a while now without any issues.
However, today the sub wouldn't go from stand-by to active when there was a signal (wii U for example).
What could be the issue? Is there something wrong with the sub or could it be the receiver?
If it's the sub: I had my eye on the Pioneer s-51w, would it be an upgrade?