I'm trying to figure out when a speaker might be too large for a cabinet or in this case a combo. I recently picked up a mid 90's tube combo and see that the 12 inch speaker is larger than the grill cloth opening by about an inch. Also, as I look for other possible replacements to open up the sound a bit I see that almost all 12 inch speakers won't fit. Pretty much limited to Jensen C12Q, Mod 12-35 or 50, and the WGS G12Q. Basically anything with a small magnet and basket combo. This amp is about the same size as my Princeton with a 10 in it. It's much smaller than the DR or an AC15 - both 12's. My thoughts are that the designer wedged a 12 in there when in fact a 10 may have been a better decision. But before I go cutting a new baffle, would a smaller speaker open up the sound more or does speaker size to cabinet size even relate to the boxiness sound? I see complaints about 'boxiness' relating to speakers being to large for the enclosure. What other effects on sound is impacted by speaker size to cabinet size?