Yep! Somebody will be along shortly to show you how to fix that easy! I've seen the pics posted but dont know how to link...basically, you remove those four speaker screws, buy two U shaped plastic plumbing pipe thingys they sell at the Home Despot and screw it on in those holes! You might have to get 4 longer screws, but basically thats it...Never any more trouble after that fix...I suppose a guy could use those copper pipe hangars as well...I have some around here someplace...
In fact, you can go to the For Sale section of this forum!...Beephead just showed a pic of his AtPro he modded with the brackets just as I was describing....He has his rig up for sale, but the pics is what you need to see...