45 Good value for classroom use These powered speakers are easy to set up and the sound is optimized for classrooms and conference rooms. They are loud enough to provide clear dialog in the 36-student rooms that are common in Southern California schools like mine. The bass is only adequate, so I would not recommend them for more than occasional use for music. It's nice to see that they use mechanical volume and tone controls with center detents, rather than buttons. The power adapter is a "brick" type, so it doesn't hog space on a typical AC power strip.