I was wondering if Celestion Pulse 10 would be a good replacement for stock "special design" speaker. Would it change the dynamics i.e. tuning of cab detrimentally. A buddy of mine changed speaker in his and got better sound quality but also got an annoying buzz when playing a F# note. Only F# low e, 4th fret d string, 6th fret a string and so on. Could not adjust controls to eliminate it but narrowed it down to just 2nd fret E string after changing some settings. Would this happen if I change or is it something else not speaker. Newby here so curious to know.