Cheap combo amps come with cheap Chinese speakers. That’ how they are cheap. I have learned that the number one tone changer and improvement one can make is to replace the speaker.
I put an Eminence Legend BP102 10 inch speaker into my Ampeg BA-110 combo. It has a resonant frequency of 35Hz which means this guy goes low, real low. At low volumes I rattle the walls. I’m going to tame that of course, but I wield the power! It responds to my mid knob much better than the stock so another win.
It’s a 200w speaker being driven by a 40watt amp so it’s quite stable but doesn’t get very loud. I don’t want speaker breakup for bass anyway. Meant for recording so all good.