It mostly has to do with speaker size. It is hard to generate the low frequencies with a small cone. For a bass amp I use an old Peavey KB60 60 watt keyboard amp I've had for 25 years, originally purchased for other uses. Being a keyboard amp, it is more full range than guitar amps, which tend to be limited in frequency response. With a 15" speaker, and does a credible job as a bass amp. A real bass amp would probably be even better, but tends to be even larger and heavier.
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