Two-way audio speaker arrangement
View Patent ↗A speaker arrangement comprises a first sound transducer ( 101 ) for reproducing sound in a lower frequency range and having a first on-axis direction and a first center point. The arrangement further comprises a second sound transducer ( 103 ) for reproducing sound in a higher frequency range, the second sound transducer ( 103 ) being mounted in front of the first sound transducer and having a second on-axis direction and a second center point. The transducers are positioned such that an angle between the first on-axis direction and the second on-axis direction is between 45° and 135°, and such that the distance between the first center point and the second center point is not higher than a cross-over wavelength corresponding to the cross-over frequency. The cross-over frequency between the lower frequency range and the higher frequency range is selected to be within the interval from 1.5 kHz to 3 kHz. An improved point source approximation may be achieved.
1. A speaker arrangement comprising:
a first sound transducer for reproducing sound in a lower frequency range and having a first on-axis direction and a first centre point; and
a second sound transducer for reproducing sound in a higher frequency range, the second sound transducer being mounted in front of the first transducer, the second sound transducer having a second on-axis direction and a second centre point;
wherein an angle between the first on-axis direction and the second on-axis direction is between 45° and 135° and a cross-over frequency between the lower frequency range and the higher frequency range is within the interval from 1.5 kHz to 3 kHz and a distance between the first centre point and the second centre point is not higher than a cross-over wavelength corresponding to the cross-over frequency, wherein a maximum dimension of an enclosure for the second sound transducer is less than a quarter of the cross-over wavelength.
2. The speaker arrangement of claim 1 wherein the first sound transducer is arranged in an upfiring configuration with the first on-axis direction having an angle relative to vertical of less than 50° with the speaker arrangement in an operational configuration.
3. The speaker arrangement of claim 1 wherein the second transducer is arranged in a front firing configuration with the second on-axis direction having an angle relative to horizontal of less than 50° with the speaker arrangement in an operational configuration.
4. The speaker arrangement of claim 1 wherein a volume of an enclosure for the second sound transducer is less than 4·d3 where d is a maximum dimension of a radiating surface of the second sound transducer.
5. The speaker arrangement of claim 1 wherein a volume of elements of a mounting arrangement for the second sound transducer within a space defined by a periphery of a radiating surface of the first sound transducer infinitely extended along the first on-axis direction is less than 6·d3 where d is a maximum dimension of a radiating surface of the second sound transducer.
6. The speaker arrangement of claim 1 further comprising:
a first enclosure ( 301 ) comprising only the first sound transducer;
a second enclosure ( 303 ) comprising only the second sound transducer; and
a mounting structure ( 305 ) for positioning the first enclosure relative to the second enclosure.
7. The speaker arrangement of claim 1 wherein a volume of the mounting structure within a space defined by a periphery of a radiating surface of the first sound transducer infinitely extended along the first on-axis direction is less than 0.5·d3 where d is a maximum dimension of a radiating surface of the second sound transducer.
8. The speaker arrangement of claim 1 wherein a volume of elements of a mounting arrangement for the second sound transducer within a space defined by a periphery of a radiating surface of the first sound transducer infinitely extended along the first on-axis direction is less than 200 cm 3 .
9. The speaker arrangement of claim 1 wherein a volume of the enclosure for the second sound transducer is less than 21 liters.
10. The speaker arrangement of claim 1 wherein an area of a radiating surface of the first sound transducer covered by a projection along the first on-axis direction of elements of a mounting arrangement for the second transducer is less than 50% of a total area of the radiating surface.
11. The speaker arrangement of claim 1 wherein the second centre point lies within a space defined by a periphery of a radiating surface of the first sound transducer infinitely extended along the first on-axis direction.
12. The speaker arrangement of claim 1 wherein a distance from a closest point of the second sound transducer to the first on-axis direction is less than a quarter of a maximum dimension of a radiating surface of the first sound transducer.
13. The speaker arrangement of claim 1 wherein the distance between the first centre point and the second centre point is higher than one tenth of the cross-over wavelength.
14. A method of providing a speaker arrangement, the method comprising:
providing a first sound transducer for reproducing sound in a lower frequency range and having a first on-axis direction and a first centre point; and
providing a second sound transducer for reproducing sound in a higher frequency range, the second sound transducer being mounted in front of the first transducer, the second sound transducer having a second on-axis direction and a second centre point;
wherein an angle between the first on-axis direction and the second on-axis direction is between 45° and 135° and a cross-over frequency between the lower frequency range and the higher frequency range is within the interval from 1.5 kHz to 3 kHz and a distance between the first centre point and the second centre point is not higher than a cross-over wavelength corresponding to the cross-over frequency, wherein a maximum dimension of an enclosure for the second sound transducer is less than a quarter of the cross-over wavelength.