Hi and welcome to the forum!
I agree with those above; I think you simply need better equalization, either a parametric EQ or relatively inexpensive graphic equalizer or EQ pedal. Many PA channels have decent parametric EQ built in, which is how I tamed this problem for years, but it doesn't sound like you are using a channel strip.
The old Yamaha 375 is a very decent acoustic. I do hope you find a cost-effective answer to your booming bass...
Regards, Glenn
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