The inner hole is about 54mm in diameter and is generally used for 6-10 inch speakers, subwoofers, etc. The speaker shell open hole diameter is about 60mm, the airflow is very smooth. Speaker inverting hole, also known as sound tube and air hole, often used in inverting type speakers. It is mainly to overpower the air flow sound of the speaker vibration in the box and overlap the sound pressure of the radiation in front of the speaker to produce a bass effect. Made of high quality material, this product is sturdy and durable.
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