I'm not sure what a "Mac" type is or if I am one, but I do know that electric guitar amps color the tone too much, even the clean or undistorted tone is colored. Acoustic amps are much closer to mini PA systems that are designed around the frequencies that acoustic guitars produce. No really low lows, no really high highs, but crystal clear anywhere from low E to the 20th fret on the High E.

So adding a tweeter to an electric guitar amp probably won't do much other than give you an ice-pick-ey tone. Maybe you could get there with some massive EQ but my experience has been that if you're not starting with something close to what you want, you're not going to end up with anything good just using enhancements.

Similarly if you plug an electric guitar directly into a PA, it sounds pretty dull and lifeless but an acoustic guitar generally sounds fine.

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