4. Follow all instructions. 5. Do not use this apparatus near water. 6. Clean only with a dry cloth. 7 Glad I didreally added a new dynamic to my overall sound. Was this review helpful to you? Great Powered Sub for its size I picked one up to have a Mackie's SRM1550 is another addition to the successful SRM series, designed specifically for use with the SRM 350 and SRM 450 active loudspeakers. Download MACKIE SRS1500 ACTIVE SUBWOOFER service manual & repair info for electronics experts. The 1200W SRM1550 subwoofer is packed with plenty of power and versatility to match SRM loudspeakers perfectly. The SRM Portable Series is beyond powerful andThe Mackie SRM1550 powered subwoofer is designed from the ground up to be the perfect match for SRM450 and SRM350 speakers, delivering 1200W.