Feature:1. The height of the inverted tube is 115mm and the opening is 100mm. It is suitable for speakers with 8-12 inch speakers. 2. The inner side is and the bell ends are designed at both ends. The more→airis very and the airis obviously improved. 3. Speaker inverting hole, also known as sound tube and air hole, often used in inverting type speakers.It is mainly to overpower the air 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. 4. With anti - rat net to prevent rats from damaging the product, more considerate. . Made of high quality ABS plastic, this product is sturdy and . Specification:I
