| 摘要 |
The present invention relates to a loudspeaker (1) including a first driver (3), which is configured to produce a first frequency band (B1) and a corresponding first acoustic axis (10), a second driver (4), which is configured to produce a second frequency band (B2), which is different from the first frequency band (B1) but may overlap in a cross-over region, and which second frequency band (B2) has a second acoustic axis (11), and an enclosure (2) enclosing said drivers (3, 4) and comprising a three dimensional wave guide (8) positioned on a front surface of the enclosure (2) and around the first driver (3). In accordance with the invention the three dimensional waveguide (8) comprises an acoustically selectively transparent portion (6) which is acoustically essentially reflecting to sound waves of the first frequency band (B1) propagating in a direction angled to the first acoustic axis, the waveguide portion (6) is essentially transparent to sound waves of the second frequency band (B2) propagating in the direction of the second acoustic axis (11) through the waveguide portion (6), and in that the second driver (4) is positioned inside the enclosure (2) behind the acoustically selectively transparent portion (6). |
