Boom Mat Speaker Baffles Maximize Speaker Performance By Isolating The Correct Frequency Responses While Damping Reverberation In The Sheet Metal And Panel To Frame Resonance. Also Forms A Water Tight Protective Shell To Prevent Moisture Intrusion. Closed Cell Polyethylene Enhances Frequency Response For Improved Sound Clarity Easy Conformability In Tight Spaces For A Professional Installation Isolates Frequency Responses And Prevents Sound From Migrating To Unfavorable Areas In The Vehicle Such As Door Panels.