Professionals choose the XL Series 4.5XL 400W 8ohm 4x10" +1x5" Aluminum Cone Bass Speaker Cab because of its carefully calibrated and tuned cabinet design and high quality aluminum-cone drivers. XLs produce a smooth response along with the clear, punchy attack that changed the sound of bass. Each cabinet is built tough with a shockproof metal grill, reinforced corners, recessed carry handles and a rugged covering. Four maximum impact Hartke 10" drivers and a custom 5" high-frequency speaker in a tuned, ported cabinet. Handles up to 400 watts at 8 ohms. Wide frequency response of 30 Hz to 12 kHz for more coverage. Ultimate Hartke.