Pro Audio Tuned6” x 9” speaker enclosures are designed to dramatically improve the sound quality and bass response of any 6” x 9” speaker system. High Grade MDFfeaturing a 5/8” MDF front baffle for solid frequency response and accurate music reproduction. Recessed Side Panelsprovide a resonant free solid construction to reduce rattles and improve the overall sound quality. Push & InsertSpeaker Terminalshelp ensure a solid grip on the speaker wires for music signal transfer. Terminal cups are sealed and screwed tight to the enclosure to ensure no air leaks. OEM Grade Rugged Liner is a spray liner finish designed to take a beating and helps seal seamsand prevent air leaks.