This is the original SVS 25-31 PC cylinder subwoofer. This sub is tuned to 22 hrz. This unit contains the upgraded driver (a $129 value). Mechanically sound. Cosmetically great. Asking $425 + actual shipping costs. I'll accept MO from national bank or US Postal check. I'll also would ship COD via UPS for additional cost. Ron Boster [email protected] PS: Long time member here and avs forum. Seller here and audiogon under "rboster." PSS: The shipping charges for this sub is $40.