Bass Cabinet Hartke for working bass players. Built tough like our world-class XL Series, each features rugged, roadworthy cabinets with metal grills and our versatile TP aluminum-cone drivers for great sound and coverage. More bass for less. A duct-vented cabinet design combines with low range 15" aluminum-cone bass driver. Power handling of 150 watts at 8 ohms. Wide frequency response of 40 Hz to 2.5 kHz.