Backrest speakers

1. A seat comprising:

a seat headrest portion;

a seat backrest portion; and

a loudspeaker assembly associated with the seat backrest portion and having an acoustic directivity angled upward above a nominal ear position of an occupant,

wherein the acoustic directivity is angled upward higher than an expected ear position of approximately 80% of a population of potential occupants,

wherein an angle of the acoustic directivity provides an acoustic output to achieve a consistent frequency response across a range of positions deviating from the nominal ear position, wherein the consistent frequency response is characterized by a high frequency (HF) consistency greater than an HF consistency for an acoustic output provided to the nominal ear position, wherein HF is equal to or greater than approximately 4 kilo-Hertz (kHz).

2. The seat of claim 1 , wherein the acoustic directivity is angled upward higher than an expected ear position of approximately 90% of the population of potential occupants.

3. The seat of claim 1 , wherein the acoustic directivity is angled upward higher than an expected ear position of approximately 95% of the population of potential occupants.

4. The seat of claim 1 , wherein the acoustic directivity is angled upward higher than an expected ear position of approximately 97% of the population of potential occupants.

5. The seat of claim 1 , wherein the angle of the acoustic directivity is at least 36 degrees above horizontal.

6. The seat of claim 1 , wherein the angle of the acoustic directivity is at least 40 degrees above horizontal.

7. The seat of claim 1 , wherein the loudspeaker assembly is positioned such that a center of the acoustic output of the acoustic assembly is less than 600 mm vertically higher than a hip point of the seat, while the backrest portion is declined about 21 degrees from vertical.

8. The seat of claim 1 , wherein the loudspeaker assembly is positioned such that a center of the acoustic output of the acoustic assembly is less than 575 mm vertically higher than a hip point of the seat, while the backrest portion is declined about 21 degrees from vertical.

9. The seat of claim 1 , wherein the loudspeaker assembly comprises:

at least one loudspeaker for generating the acoustic output; and

an acoustic exit fixed in the seat backrest portion and angled to provide the acoustic output with the acoustic directivity angled upward above the nominal ear position of the occupant.

10. The seat of claim 9 , wherein the at least one loudspeaker is located proximate the acoustic exit.

11. The seat of claim 9 , wherein the at least one loudspeaker is separated from the acoustic exit.

12. The seat of claim 9 , wherein the acoustic exit is fixed relative to the seat backrest portion, wherein the loudspeaker assembly comprises a pair of separate loudspeaker assemblies on opposing sides of a centerline of the seat backrest portion, and wherein each of the pair of separate loudspeaker assemblies is separated from the centerline by approximately 200 mm to approximately 300 mm, and wherein the consistent frequency response is further characterized by a low frequency (LF) consistency of approximately 5 percent to approximately 20 percent less than a LF consistency for the acoustic output provided to the nominal ear position.

13. The seat of claim 1 , wherein the seat headrest portion is adjustable relative to the seat backrest portion.

14. The seat of claim 1 , wherein the seat backrest portion extends above a nominal shoulder of the occupant.

15. The seat of claim 9 , wherein the angle of the at least one loudspeaker is oriented at an upward angle of about 34 degrees to about 44 degrees relative to horizontal.

16. The seat of claim 15 , wherein the angle of the at least one loudspeaker is oriented at an upward angle of about 37 to about 41 degrees relative to horizontal.

17. An automobile seat comprising:

a seat headrest portion;

a seat backrest portion; and

a loudspeaker assembly associated with the backrest portion and having an acoustic directivity angled upward above a nominal ear position of an occupant, wherein the loudspeaker assembly includes: at least one loudspeaker for generating an acoustic output; and an acoustic exit fixed in the seat backrest portion and angled to provide the acoustic output with the acoustic directivity angled upward above the nominal ear position of the occupant,

wherein the acoustic directivity is angled upward higher than an expected ear position of approximately 95% of a population of potential occupants,

wherein an angle of the at least one loudspeaker provides the acoustic output to achieve a consistent frequency response across a range of positions deviating from the nominal ear position, wherein the consistent frequency response is characterized by a high frequency (HF) consistency greater than an HF consistency for an acoustic output provided to the nominal ear position, wherein HF is equal to or greater than approximately 4 kilo-Hertz (kHz), and wherein a roof or a headliner of the vehicle provides acoustic reinforcement for the user to maintain the HF consistency.

18. The automobile seat of claim 17 , wherein the loudspeaker assembly is positioned such that a center of an acoustic output of the acoustic exit is less than 575 mm vertically higher than a hip point of the vehicle seat while the backrest portion is declined about 21 degrees from vertical.

19. The automobile seat of claim 18 , wherein the loudspeaker assembly is positioned such that a center of an acoustic output of the acoustic exit is between about 450 mm and about 525 mm vertically higher than a hip point of the vehicle seat while the backrest portion is declined about 21 degrees from vertical, and wherein the consistent frequency response is further characterized by a low frequency (LF) consistency of approximately 5 percent to approximately 20 percent less than a LF consistency for an acoustic output provided to the nominal ear position.

20. A seat comprising:

a seat headrest portion;

a seat backrest portion; and

a loudspeaker assembly associated with the seat backrest portion and having an acoustic directivity angled upward above a nominal ear position of an occupant,

wherein the acoustic directivity is angled upward higher than an expected ear position of approximately 80% of a population of potential occupants,

wherein an angle of the acoustic directivity provides the acoustic output to achieve a consistent frequency response across a range of positions deviating from the nominal ear position, wherein the consistent frequency response is characterized by at least one of: inter-aural isolation for the occupant, head turn isolation for the occupant, or seat-to-seat isolation between multiple occupants of a space including the seat.

21. The seat of claim 20 , wherein the angle of the acoustic directivity is at least 36 degrees above horizontal.

22. The seat of claim 20 , wherein the angle of the acoustic directivity is at least 40 degrees above horizontal.

23. The seat of claim 20 , wherein the loudspeaker assembly comprises:

at least one loudspeaker for generating the acoustic output; and

an acoustic exit fixed in the seat backrest portion and angled to provide the acoustic output with the acoustic directivity angled upward above the nominal ear position of the occupant.

24. The seat of claim 23 , wherein the at least one loudspeaker is oriented at an upward angle of about 34 degrees to about 44 degrees relative to horizontal.

25. The seat of claim 23 , wherein the at least one loudspeaker is oriented at an upward angle of about 37 to about 41 degrees relative to horizontal.