Hello! New guy here. I've been reading your forums quite a bit to try and learn a little more about bass amps. I am a guitarist originally but recently started playing bass as well. Last week I picked up an absolute mint condition 1979 Ampeg B-15s. Not a bad first bass amp! While I'm loving the tone for more old-school kind of sounds, I'm not entirely convinced that the sound is appropriate for the current project I'm playing in. Believe it or not, I find the sound a little too thick and boomy. I realize that this is largely a factor of cabinet and room. However, I am wondering if any of you have replaced the speaker in the cabinet to give a slightly more balanced sound? It currently has a square magnet Eminence driver. Are the newer Eminence offerings (thinking Beta/Delta) a little more flat in their response? I'd love to hear anyone's experiences with changing speakers in their 70s B-15! Thanks!