I was able to audition both, at my brothers house. I must say, the 500, when positioned correctly, will be LOUD! The 600 is the same way! LOUD! I am happy with my 600...and glad that the outlet offers a discount. I suppose, had I owned this home, I might get another one...but, for now, one does the trick darned well. I love it. The combination of the 600 and the 80's is all music to my ears....and the heart palpitations will agree.