Bought two of these for my twin daughters’ 18th birthday party. Tested them before the party and thought they were fairly loud but wondered if they would do the job with 80 people absorbing some of the sound. Well, no need to worry. These speakers produce a fantastic sound, with a deep base that fill the room. When they are turned up even with the Xtra bass on you get that club feel. We could feel the vibrations through the floor. I am no expert so could not tell you if the sound is the purest but that did not spoil the enjoyment. The lights help to create additional atmosphere and in a darkened room give just enough light to create that party ambience. If you don’t want the lights- simply turn them off. Bluetooth connectivity is simple and the option to have multiple phones connected giving different people the chance to play their tunes is generally pretty good. Other great features are the microphone connection allowing you to make announcements or turn the speakers into a karaoke machine. Linking the speakers is really simple and the internal battery gives you extra flexibility. The one downside about these speakers is that you need to find somewhere to store them when they are not in use but that is a small price to pay given that they are available whenever you need a big sound.