JL Audio M6-880X-S-GwGw M6 Series 8.8" marine speakers (Gloss White Sport Grille)Overview M6 8. 8 inch Marine Coaxial Speakers (125 W, 4 ) Gloss White Trim Ring, Gloss White Sport Grille The same principle that makes our 7. 7 inch marine speakers dominate over conventional 6. 5 inch designs is delivered in a more powerful dose in our M6 880X 8. 8 inch coaxials. 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.