Check the listing for details. Visaton BR 25.50 Angled Speaker Cabinet Port Tube 3? ID x 10? L Flared. Condition: New. Listed at 26.83 USD. The Visaton BR 25.50 is a premium bass-reflex vent meticulously designed to enhance your audio experience. Crafted with precision, it features a unique bent design that significantly reduces air-flow noises and friction losses. _x000D_ _x000D_ The BR 25.50 boasts two flow-resistant, optimized trumpet-shaped vent outlets. This innovative design not only mitigates air-flow noises but also lowers friction losses, ensuring your audio output is always powerful and clear. _x000D_ _x000D_ With a tube length of 25 cm, the BR 25.50 is compact yet robust, making it perfect for a variety of speaker configurations. It also features a large surface opening of 50 cm², providing an unrestricted pathway for sound waves and enabling your audio system to deliver richer, deeper, and more resonant bass. _x000D_ _x000D_ The BR 25.50's cutout diameter is ø97 mm, which ensures it can be easily installed into a wide range of speaker setups.