MB Quart strives to push the boundary in perfecting sound from speakers. The top of the line . Premium Series speakers truly makes Music??Defined. This pair of audiophile Premium Series 6-1/2 In. 2-Way Component Speakers is loaded with external magnesium tweeters and external audiophile crossovers for exceptional music production. The series’ WideSphere technology has a removable phase lens to create a larger-than-life soundstage. And the Curvilinear Cones provide strength and superior bass frequency reproduction. The MB Quart Premium Series will offer you levels of clarity . coupled with rich quality sound . creating superior audio for all of your playlists that simply demand the best.