Speaker Tweaker Anechoic Pads
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Speakers reproduce acoustic signals as sound waves and send them in two directions: forwards and backwards. We hear the sound waves sent forward as the desired music. Sound waves that are sent backwards go inside the door panel and then reflect back towards the speaker. This rear wave reflection interferes with the natural movement of the speakers causing distortion and acoustical cancellation. Adding Speaker Tweaker Anechoic Pads inside your door will break up these backfire waves and improve your speaker's mid-range and mid-bass.
Recommended adhesives: Super Strong Double Sided Tape or super glue
Speaker Tweakers were featured on a quick explainer by ShowtimeSPL to explain the science.