Hello all. I don't know if this is the right category so if it needs to be moved, then please do so. I have an older Yorkville 400B combo. The one with the 400B head and a 15" speaker. I have been recently been finding my sound at gigs that I have been playing, that I just don't have enough top end. So I talked to my Sound teacher(in college for Recording Arts) and he said that I could install a piezo tweeter, I wouldn't necessarily need a crossover because it could have the capacitor on it. Now assuming I can find one here in the little town I am in, how would I wire that? Would I take out the speaker and wire the new tweeter in parallel with the main 15? Any information on this would be great. Thanks in advance.