MTX SW1515 Subwoofer "noise thud" Questions

...thud when i turn it on? and can i fix the problem When a subwoofer first notices a signal on the incoming line, this causes the amp to kick on which can result in some initial "noise" as the amp ...

I had my eltax thunder 10 for a few months and it was working fine then one day I turned it on and there was no sound. There is still power as the green light comes on and im sure it hasnt blown as ...