DESC: 51 Hz - 300 Hz, 2400 Watts program, 4 Ohms, Baltic birch enclosure, The SP 218 subwoofer is designed for large systems and works perfectly with the Peavey SP line of enclosures. The SP 218 uses two custom designed large excursion 18 in. Pro Rider Black Widow woofers that can produce incredible deep bass with very low distortion handling up to 4800 Watts of peak power.