Hey guys, got a question I hooked up those wharfdale bookshelf speakers - 150 watt 60 hz 20 kHz frequency response, 25mm dome tweeter, to my pioneer vsx521 receiver, I had them running for a 3 to 4 hours at fairly high volumes and one of the speakers stopped working, I took them back to the store and the manager told me they are not meant to have massive bass til you run them in?? Can anyone tell me if this is true? And if so how do I do that? Shouldn't these speakers with these ratings be able to handle that? And I'm only running a 70 watt yamaha 6 inch sub.