Dave, thanks for taking the time to take my call today. Your advice was put to use and just wanted to give you an update.
Switching the speaker wires yeilded the same results, which discounts the problem with the amp.
I proceeded find the buzz/distortion/hiss sounds, but it sounded like it was coming from the whole range of the 48 inches. I started at the point where I felt it was the most noticable and began to tweek the inner screws ever so gently as you put it
I did notice after tweeking a little that the hiss started to go away as I kept tweeking.
End result for now, after tweeking almost all the screws (since the hiss was coming from the full range) the hiss has dramatically dropped, but yet still there if I concentrate for it.
Thanks for all your advice!