Purpose engineered and built for real marine duty, M3 coaxial systems deliver excellent performance at a more affordable price than our maximum performance M6 models. The M3-650X 6-1/2 in coaxial speaker is designed around the standard marine 6-1/2 in speaker format and features a wide mounting flange with a 4-hole mounting pattern. The long excursion woofer design and excellent power handling make your music come through loud and clear at speed or at anchor. The woofer design is optimized to operate with a large volume of air behind it (at least 2 cu-ft/57 L). Operating this coaxial system in less space will compromise its low frequency performance. A 3/4 in pure silk dome tweeter, specially treated to withstand the marine environment, handles the high frequency duties. Silk has been chosen for its lightness, excellent damping properties and smooth response characteristics. Although M3-650X coaxial systems can be used with as little as 20 W per channel, for best audio performance we recommend amplifiers capable of between 75 to 100 W of continuous power per channel.