How loud is too loud for those tweeters? The difference between them and the daytons (or any other tweeter for that matter) seems quite extreme. I don't listen to things very loudly so I'm wondering if they would work for me(my receiver, a panasonic XR-55 only gets to -20 very rarely)

http://www.partsexpress.com/pe/showdetl.cfm?&Partnumber=276-152

These tweaters have similar specs to the dayton ones (the daytons do look almost identical to the axioms. I wonder if they're really the same)and they look as though they would be compatible. They look a bit cheap though. It's strange to me that those Usher tweeters have such low power restraints.