Adjustable Bass Reflex Tube for Home Built Speakers.
 
An excellent item for fine tuning speaker cabinets & allowing you to achieve a tailored bass response to your personal liking; they are also very handy for experimentation when finalising designs or replacing bass units.

These telescopic ports are so simple to install & use, an essential item for the loudspeaker hobbyist or builder:

Tube bore: 35mm

Outside diameter: 45mm

Adjustment range: 110-210mm

Flange diameter: 65mm

Cross section area: 9.6cm squared

We also stock a large version for in-car and disco applications.