Is this hum normal on a Mark V 25 1x10 Combo?

[harpdevice]

Hello,
I recently bought a Mark V 25 1x10 used from Sweetwater.
Is this speaker noise normal?

Please watch the video:

https://youtu.be/I3V0KXjG3B0

Thanks

 

[Don]

If I recall, mine sounded similar.