A dash mat can serve many purposes for a SQ system, your dash will be able to reflect, refract or absorb sound. Depending on what you need and weather the sound is really interacting with the dash at all, a dash mat can be great or terrible or no results at all. Design one correctly and it make a word of positive change. Different materials do different things... so have fun

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MECA SQ

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I don't know what your problem is, but I'll bet it's hard to pronounce.