Two great options in bass bins, the LS-728PRO Dual 18” high powered 1400 Watts RMS and the LS-18B 600 Watts RMS speakers, incorporates precision transducers and crossover design, painstakingly developed over 500 hours of R & D to deliver punchy, precise, low end response. 4 optional sturdy wheels, 5 inches in height (2 fixed & 2 moving) for LS-28B make the speakers very portable and easy to move. The LS-18B comes equipped with 4 moving wheels. The flying option saves a lot of space in LS-28B. Check these 2 options and you will be stunned by the tight steel fisted bass.