Originally posted by SoftwireEngineer
Sound power is different from Electrical power. Sound power is referenced off the 'threshold of hearing' of .000000000001 watts/square meter (that is 10 to the power of...
If you really want to save money you could make it yourself. It's not that hard. Just get some wood and screws and glue. That way you can make it exactly the size you want and include space for future expansion.