I now have two of these and linked them with a female to male xlr cable. I've used them at maximum volume and they are loud enough for a 4m x 4m room but I wouldn't recommend them for bigger events like weddings etc. The supplied instructions aren't brilliant and you have to play around a little to work out the spekers settings. I've used them on Bluetooth, line in and with a usb stick and they work well. One the master the other the slave of course. The remote control seems to work in USB only. You use the input source volume control the rest of the time. I love the lights on the front. I now have the Vonxy stands and they really make thse speakers look the pro job. Nice sound quality too. I love my pair of LM65s and I'm sure your will too. The sound was at 60% in my video.