Equipment including down-firing speaker

1. A desktop device, comprising:

a housing having a bottom side configured to face a surface on which the device is placed, a front side and a speaker port on the bottom side;

a down-firing speaker facing the speaker port on the housing; and

a horn assembly on the housing arranged to define a speaker horn, the speaker horn having a throat region proximal to the speaker port and a mouth proximal to the front side of the housing, and first and second sidewalls having proximal ends proximal to the speaker port and distal ends proximal to the mouth, the first and second sidewalls being separated by a first width W1 proximal to the speaker port, and the distal ends of the first and second sidewalls being separated by a second width W2 proximal to the mouth, where W2 is greater than W1.

2. The device of claim 1 , wherein the speaker comprises a diaphragm and a phase plug, the phase plug having an aperture or apertures opening into the speaker port.

3. The device of claim 1 , wherein first and second sidewalls have a first height H1 proximal to the speaker port, and the distal ends of the first and second sidewalls have a second height H2 proximal to the mouth, where H2 is greater than H1.

4. The device of claim 1 , wherein the speaker comprises a diaphragm and a phase plug, the phase plug having an aperture or apertures opening into the speaker port; and including a ring disposed in the speaker port around a perimeter of the phase plug, the ring having a smooth outside surface defining an inside wall of the horn assembly at the speaker port.

5. The device of claim 1 , wherein the horn assembly is arranged so that the speaker horn has substantially continuously increasing volume from the throat region to the mouth.

6. The device of claim 1 , including a microphone and a microphone port, the microphone port being located on the housing in a position spaced laterally away from the horn assembly so that dispersion of acoustic energy in air from the speaker is diverted from the microphone port by a sidewall of the horn assembly.

7. The device of claim 1 , including a microphone and a microphone port, the microphone port being located on the housing in a position spaced laterally away from the first sidewall.

8. The device of claim 7 , wherein the first sidewall includes a surface pad configured to contact the surface along a majority of its length from the throat region to the mouth, and the second sidewall is configured to sit above the surface along a majority of its length from the throat region to the mouth.

9. The device of claim 1 , wherein the speaker comprises a diaphragm and a phase plug, the phase plug having an aperture or apertures opening into the speaker port; and the horn assembly includes a ring in the speaker port having a ring surface facing the phase plug configured to form a transitional volume without substantial discontinuities on the ring surface opening into the speaker horn.

10. The device of claim 1 , including a microphone, and a telephone connected to the microphone and the speaker.

11. The device of claim 1 , including a microphone, and a telephone compatible adaptor connected to the microphone and the speaker.

12. A desktop device, comprising:

a housing having a bottom side configured to face a surface on which the device is placed, a front side and a speaker port on the bottom side;

a down-firing speaker facing the speaker port on the housing;

a microphone port on the housing;

electronics on the housing, including a speaker driver electronically connected to the speaker, and a microphone; and

a horn assembly on the housing arranged to define a speaker horn in combination with said surface, a speaker horn having a throat region proximal to the speaker port and a mouth proximal to the front side of the housing, wherein the horn assembly comprises first and second sidewalls on the housing having proximal ends proximal to the speaker port and distal ends proximal to the mouth, the first and second sidewalls being separated by a first width W1 proximal to the speaker port, and the distal ends of the first and second sidewalls being separated by a second width W2, where W2 is greater than W1 proximal to the mouth, and the first and second sidewalls having a first height H1 proximal to the speaker port, and the distal ends of the first and second sidewalls having a second height H2 proximal to the mouth, where H2 is greater than H1.

13. The device of claim 12 , wherein the speaker comprises a diaphragm and a phase plug, the phase plug having an aperture or apertures opening into the speaker port.

14. The device of claim 12 , wherein the speaker comprises a diaphragm and a phase plug, the phase plug having an aperture or apertures opening into the speaker port; and

including a ring disposed in the speaker port around a perimeter of the phase plug, the ring having a smooth outside surface defining an inside wall of the horn assembly at the speaker port.

15. The device of claim 12 , wherein the horn assembly is arranged so that the speaker horn has substantially continuously increasing volume from the throat region to the mouth.

16. The device of claim 12 , wherein the microphone port is located in a position spaced laterally away from the horn assembly so that dispersion of acoustic energy in air from the speaker is diverted from the microphone port by a sidewall of the horn assembly.

17. The device of claim 16 , wherein the first sidewall includes a surface pad configured to contact the surface along a majority of its length from the throat region to the mouth, and the second sidewall is configured to sit above the surface along a majority of its length from the throat region to the mouth.

18. The device of claim 12 , the horn assembly including a ring in the speaker port having a ring surface facing the phase plug configured to form a transitional volume without substantial discontinuities on the ring surface opening into the speaker horn volume.

19. The device of claim 12 , wherein the housing includes a first upwardly facing portion having a user interface and a second upwardly facing portion having a tray configured to receive a mobile computing device, and wherein the speaker port is disposed beneath the first portion and the microphone port is disposed beneath the second portion.