The BF-15 speaker is a high fidelity, multi-purpose speaker. The whole series of loudspeaker units are imported advanced units. The phase and frequency response curves are very smooth by precise computer calibration. The whole box is made of imported IPC board. The metal connectors inside the box connect the box into one, which improves the reliability of the box. Built-in 15 "bass unit and 1.75" tweeter, horn coverage angle 80 X50. Vertical or horizontal adjustments may be made according to the circumstances.