Hartke HD75 75W Bass Combo - 12"The HD75 Bass Combo packs Hartke's patented HyDrive speaker technology into a sleek combo design that greatly enhances your low end tone and has enough power to handle any rehearsal room or small venue. The HD75 also maintains Hartke's commitment to producing quality bass amplification with exceptional durability. The HyDrive Design The HD75 (75 watt, 12" driver, 1" tweeter) features Hartke's patented HyDrive speaker technology, which offers a