I have a TAD-150 playing through a McCormack DNA-1 into Vandersteen 2CE sigs. I have never heard the JBL's but, if you really want to see what the TAD-150 can do get yourself speakers that image real well like the Vandys. I listen to classic rock also and the Vandys, McCormack, TAD combo really space the music out. Also, read the reviews on both the TAD-150 and the signature.
Eagleman
Eagleman