Vehicle loudspeaker module

1. Apparatus comprising:

an audio module for use in a vehicle cabin, comprising:

an elongated substantially sealed enclosure having two ends in the lengthwise direction;

a first acoustic driver mounted in the enclosure near one end of the enclosure for radiating acoustic energy from the one end of the enclosure;

a second acoustic driver mounted in the enclosure near a second end of the enclosure for radiating acoustic energy from the second end of the enclosure; and

a bass augmenting device for radiating low frequency acoustic energy from the enclosure,

wherein the audio module is constructed and arranged to be pre-assembled so that the audio module can be installed in the vehicle as a single assembly,

wherein the audio module is configured to be mounted to the vehicle so that the lengthwise direction is substantially vertical with the first end of the enclosure higher than the second end of the enclosure,

wherein the bass augmenting device is closer to the second end of the enclosure than to the first end of the enclosure,

wherein the vehicle cabin is configured so that there is an acoustic null of radiation from the first acoustic driver at a predetermined position in the vehicle cabin in a predetermined frequency range, the apparatus comprising circuitry to cause the second acoustic driver to radiate in the predetermined frequency range and to roll off radiation from the second acoustic driver above and below the frequency range, and

wherein the first acoustic driver and the second acoustic driver are substantially full range acoustic drivers, and wherein the frequency range of the acoustic null is at about 90 Hz to about 120 Hz.

2. The apparatus of claim 1 , wherein the audio module is configured to be mounted to an instrument panel of the vehicle so that the first acoustic driver radiates acoustic energy from an upper surface of the instrument panel, and so that the second acoustic driver and the bass augmenting device radiate acoustic energy from a lower surface of the instrument panel.

3. The apparatus of claim 1 , wherein the bass augmenting device comprises a plurality of passive radiators each including a passive radiator diaphragm, the passive radiators mounted in openings in the acoustic enclosure so that in operation, the inertial forces of the passive radiator diaphragms cancel.

4. The apparatus of claim 1 , wherein the volume of the elongated substantially sealed enclosure is greater than 1.5 liters and wherein the first acoustic driver and the second acoustic driver are separated by at least 200 mm.

5. The apparatus of claim 1 , wherein the first acoustic driver and the second acoustic driver are substantially full range acoustic drivers and wherein the bass augmenting device radiates acoustic energy below 100 Hz.

6. The apparatus of claim 1 , further comprising a single receptacle for connection with a single wiring harness.

7. The apparatus of claim 1 , wherein the first end and the second end are planar and wherein the plane of the first end and the plane of the second end are parallel.

8. The apparatus of claim 1 , wherein the first end and the second end are planar and wherein the plane of the first end and the plane of the second end are non-parallel.

9. An audio system for an automobile, comprising:

an acoustic module, comprising

an elongated substantially sealed enclosure having two ends in the lengthwise direction;

a first acoustic driver mounted in one of the ends;

a second acoustic driver mounted in the second end; and

a first bass augmenting for radiating low frequency acoustic enemy from the enclosure, mounted in a side of the enclosure between the two opposing ends, mounted near the second end,

wherein the acoustic module is mounted in a vehicle cabin so that the first end faces substantially vertically upward from the upper surface on an instrument panel, and wherein the second end faces vertically downward into a footwell of the vehicle,

wherein the first bass augmenting device is closer to the second end of the enclosure than to the first end of the enclosure,

wherein the vehicle cabin is configured so that there is an acoustic null of radiation from the first acoustic driver at a predetermined position in the vehicle cabin in a predetermined frequency range, the apparatus comprising circuitry to cause the second acoustic driver to radiate in the predetermined frequency range and to roll off radiation from the second acoustic driver above and below the frequency range, and

wherein the first acoustic driver and the second acoustic driver are substantially full range acoustic drivers, and wherein the frequency range of the acoustic null is at about 90 Hz to about 120 Hz.

10. The audio system of claim 9 , wherein the elongated enclosure is substantially sealed and the volume of the substantially sealed enclosure is greater than 2 liters and wherein the first acoustic driver and the second acoustic driver are separated by at least 300 mm.

11. The audio system of 9 , wherein the first acoustic driver and the second acoustic driver are substantially full range acoustic drivers and wherein the bass augmenting device are passive radiators tuned to 55 Hz.

12. The audio system of claim 9 , further comprising a single receptacle for connection with a single wiring harness.

13. A method, comprising:

radiating, from the top of an instrument panel in a vehicle cabin, acoustic enemy from a first acoustic driver mounted near the end of an enclosure;

radiating, into a footwell of the vehicle, acoustic enemy from a second acoustic driver mounted near a second end of the enclosure; and

radiating, into the footwell of the vehicle, acoustic enemy from a bass augmenting device mounted near the second end,

wherein the vehicle cabin is configured so that there is an acoustic null of radiation from the first acoustic driver at a predetermined position in the vehicle cabin in a predetermined frequency range, the radiating into the footwell comprising radiating in the predetermined frequency range and rolling off radiation from the second acoustic driver above and below the predetermined frequency range, and

wherein the first acoustic driver and the second acoustic driver are substantially full range acoustic drivers, and wherein the frequency range of the acoustic null is at about 90 Hz to about 120 Hz.

14. The method of claim 13 , wherein the bass augmenting device comprises a passive radiator.