Are they any good? I have a Sony 52x4 CD receiver I am going to put in my '86 HJ60 but I was wondering if you would suggest replacing the speakers as well. I'm not looking for major "ice" or anything, just enough to be able to hear music of the diesel clatter on the highway. I also have a little 6" kicker I’ll probably put in it. Any thoughts? I'd check for myself but my 'cruiser is about 1000 miles away :-\ TIA