Sound quality is great at both high and low ends. Bluetooth easily connects. I use it for directly plugging in a bass, a guitar and two microphones and all sound great. I use it for outdoor ministry at a loud street corner an get crystal clear loud volume that cuts through the noisy street traffic. This is not a battery powered unit. It needs to be plugged in to AC for power. However, I plug it into a portable battery unit that I bring to the street and the pa works greats. It uses up to 450 watts of power. I've used it with both a 200 and a 350 watt rechargeable emergency back up battery units and get well over an hour of battery powered pa on the street without needing direct AC power. And by having separately purchased the emergency back up batteries, which I needed for normal-life emergency back up reasons, I now have the best of both worlds - a great portable battery powered pa on the street / great AC powered unit at home and emergency power back up for the home.