2-3 Weeks. 45 Day Lowest Price - 100% Satisfaction Guarantee. The BM10S subwoofer has been specially designed for operation with the BM series. With a 10" woofer and 200 Watts of power, this sub will surely take care of the most challenging requests. The BM10S delivers a clear and crispy punch and its size makes it the perfect match where space is an issue.