I was playing through a huge Ashdown combo during a rehearsal last night, and was surprised to find that no matter how much I played with settings and how I eq'd it, I could not get it to create that satisfying 'snap' that an SVT does so effortlessly when you dig in. Even smaller Ampeg combos are capable of doing this really well, and I've noticed that this has become part of my playing style, and I miss it when it's not there. I have an old Trace combo which can also do this really well. Does anyone know what gives some amps more 'snap' than others? is it just a tweeter, or is there more to it?