Diamond Audio HXM8F2BK 8" 2-Way High Output Coaxial 2-ohm Marine SpeakersDiamond Audio HXM8F2BK 8" 2 Way High Output Coaxial 2 ohm Marine Speakers Diamond Audio is proud to release its new and improved HXMF Black Series Coaxial Drivers. Building on the features of the HXM and HXMF platforms, the new HXMFB series increases performance where it countshigher output, more impactful bass response, and more high end with new larger 1. 5" Titanium tweeters. At Diamond Audio, we're driven by a relentless passion for perfect sound.