These 8.8-inch diameter monsters offer significant performance advantages over our 7.7 inch models, and a huge advantage over conventional 6.5 inch marine coaxials. Thanks to 36% more cone area and almost double the excursion capability, the M6-880X's are capable of +6 dB greater low frequency output than our M6-770X 7.7-inch coaxial systems! The bass is so impressive that the M6-880X can be used without a subwoofer while still packing a very serious low-frequency punch. Used with a subwoofer, they offer vastly better dynamics and mid-bass impact than smaller speakers, making them the best choice when ultimate performance is desired.