This 12" Polk Audio PSW Series Subwoofer (PSW505) drops from $399.99 to $189.99 with free shipping at Newegg. Take an additional $19 off when you sign up for V.me by Visa checkout service and use the promo code VMEPROMOMAR13. This is the lowest price we could find for this subwoofer by $79. It features a 23Hz - 160Hz frequency response range, a dynamic power output of 460 watts and has an average rating of 5 out of 5 stars from 394 Newegg reviewers. Sales tax is not charged in most states.