I went on an enjoyable river cruise on this https://www.ducdorleans.com/our-ship to experience a live band on board. It was, wait for it, a three.. hour.. cruise.
Anyway, the band that I am in, is scheduled to play during a Saturday evening cruise in August, so, I thought I'd do some learnin'. Bands typically play on the aft, upper deck. The sound guy tonight, told me that he had plenty of power to run his subs, which were place under the tops, which were at either side of the boat (boat is 28ft wide) If you look at the photo, you can see the exhaust funnel roughly midship, and, while standing there I noticed strong bass.(heh, I was checking to see if it was there). If I side-step two paces, the bass dropped and the overall sound quality cleaned up. Volume was running about 100-105db A-weighted throughout the cruise. I am interested to see if I can better it.