The Roland is only intended to go to a certain volume, so you should not try to make it sound louder as it could damage the speaker(s).
Look into getting a PA system for the band, which would include a mixer and power amp only with 2 speakers. You may prefer a mixer/amp, which would have the two combined into one box. Perhaps this could be a band purchase, as you may also want to have backing vocals, mic instruments or mic drums at times.
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