I haven't tried it yet. Honestly i can't see how anyone would want more bass than it already puts out.
In a test run, one of the kids took it to a hockey game warmup. You could hear the thumping all the way up the arena hall in the concession area, a good 50 feet away through multiple concrete walls.
And i had the volume limiter set to 90%.

"Those who preach the myths of audio are ignorant of truth."