I agree that a Bose L1 with a bass module (The Model 2 can only be bought with a bass module, with the Classic it is an option) would probably be the best solution, along with getting the drummer to lower his volume. In fact having two performers with their own L1s is a great way to go in terms of audio imaging.
Assuming a guitar is tuned the A 440, the approximate frequencies of the open strings are (5 of the 6 are below 300 Hz):
6th string =...82.41
5th String =.110
4th string =.146,83
3rd string =.196
2nd string =.246.94
1st string =.329.63
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