I have a machine that monitor, KB, and mouse reside on a small desk with a hutch and is cluttered in what little room is left over. The monitor has a optional speaker bar attached to it which isn't that bad except for the bass. I was wondering if anyone knows of anyone selling just a powered subwoofer (with built-in crossover) for computer speakers? So it would be computer to subwoofer using standard headphone connector, subwoofer to regular computer speakers using standard headphone connector. Nothing fancy... preferably ~$60 tops. Thanks in advance.