This is a Servo Drive Cabinet. That means the speakers are driven by an extremely fast Linear motor drive. It's been sitting in my garage for years. I used them in a Nite Club years ago. They only require 400 watts to drive them. This unit is very large and heavy 45"x 45"x 23" and weighs over 225 lbs Below is a link to the newer versions http://www.tritechlightandsound.com/BassTech%207%27s.html This speaker is located in Lake Havasu City, AZ Call or email me if interested (928) 208-8057 Location: Lake Havasu City, Arizona it's NOT ok to contact this poster with services or other commercial interests nevada