Did you know that the new Hartke HyDrive 5210 Bass Combo is well on its way to becoming LEED-certified? That's right! Among other "Green" features (like using partial aluminum instead of 100% paper cones), the Hartke HyDrive 5210 Bass Combo generates enough power not only for itself, but for adjoining bass cabinets. That's called "giving back to the grid," or something. I don't really understand LEED certification.