[quote name='sunburstjazz1967' timestamp='1453029347' post='2955627']
Long live speakon connectors!
[/quote]
I agree. I've seen people with no idea (I'm not saying that's the problem in this case) attempt to cable up a small PA system and simply plug in cables at random, the main criterion seemingly being that connectors actually fit regardless of the types of signals they may be carrying. Thus, speakers into line outs is quite common
I wonder if it's a hangover from the PC world? The PC industry has done a pretty good job to ensure that different signals are carried on different connectors such that it's almost impossible to hook up a PC, screw, keyboard, mouse, network and external hard drive incorrectly, while the music world still embraces a Victorian era connector!