2-3 Weeks. 45 Day Lowest Price - 100% Satisfaction Guarantee. The BM15P is the largest and most powerful speaker within the BM Passive range and is designed for any studio application where higher sound pressure levels and extended low frequency response are required. Its astonishing power handling and full range extended bass response makes it the perfect alternative to wall mounted main monitors, particularly for commercial studios, project studios and post production facilities. Recommended amp 150W to 650W, sold in pairs