LOUDSPEAKER

1 . A method comprising:

providing a loudspeaker having a digital signal processor for controlling operation of the loudspeaker and a memory coupled to the digital signal processor;

storing a unique serial number for the loudspeaker in the memory of the loudspeaker; and

selectively retrieving the unique serial number from the memory.

2 . The method of claim 1 , further comprising storing information related to the loudspeaker corresponding to the unique serial number; and retrieving the stored information based on the serial number retrieved from the memory.

3 . The method of claim 1 , wherein the stored information related to the loudspeaker includes at least one of a model number, a revision number, a date of manufacture, and a sales channel.

4 . The method of claim 1 , wherein the memory is a non-volatile memory.

5 . The method of claim 1 , wherein the unique serial number is stored in the memory during production of the loudspeaker.

6 . The method of claim 1 , wherein the unique serial number is stored in a sector of a non-volatile memory, the sector being locked in software to reduce the likelihood of any change being made to the unique serial number.

7 . The method of claim 6 , wherein the sector is also locked in hardware and made tamper-proof.

8 . The method of claim 1 , further comprising storing a model number of the loudspeaker in the memory.

9 . The method of claim 8 , further comprising storing software in the memory for controlling the a plurality of different model numbers of loudspeakers;

determining the model number of the loudspeaker from the memory;

selecting portions of software stored in the memory for controlling the particular loudspeaker based on the determined model number; and

using the selected portions of the software to control the loudspeaker.

10 . The method of claim 8 , further comprising accessing the digital signal processor with a computer separate from the loudspeaker, the computer retrieving the serial number and model number from the memory.

11 . The method of claim 1 , further comprising coupling a diagnostic tool to the digital signal processor of the loudspeaker and retrieving the unique serial number stored in the memory to facilitate at least one of maintenance, a repair, a recall, and an upgrade of the loudspeaker.

12 . A method of operating a loudspeaker comprising:

providing a loudspeaker having a digital signal processor for controlling operation of the loudspeaker and a memory coupled to the digital signal processor;

storing a model number of the loudspeaker in the memory;

storing software in the memory for controlling the a plurality of different model numbers of loudspeakers;

determining the model number of the loudspeaker from the memory;

selecting portions of software stored in the memory for controlling the loudspeaker based on the determined model number; and

using the selected portions of the software to control the loudspeaker.

13 . The method of claim 12 , further comprising storing information related to the loudspeaker corresponding to the model number; and retrieving the stored information based on the model number retrieved from the memory.

14 . The method of claim 12 , wherein the memory is a non-volatile memory.

15 . The method of claim 12 , further comprising storing a unique serial number for the loudspeaker in the memory of the loudspeaker; and selectively retrieving the unique serial number from the memory.

16 . The method of claim 12 , wherein the software determines appropriate filters to use to equalize an output of the loudspeaker based on the determined model number.

17 . A method of improving sound quality of a plurality of loudspeakers in a room, the method comprising:

providing a reference frequency response signal indicating a desired frequency response;

measuring a combined frequency response of outputs from the plurality of loudspeakers in the room;

comparing the combined measured frequency response in the room to the reference frequency response signal;

modifying an output of a first loudspeaker based on the results of the comparing step; and

using a modified output of the first loudspeaker as an input to at least one other loudspeaker.

18 . The method of claim 17 , wherein the measuring step includes measuring a combined frequency response in at least two different locations in the room and determining the combined measured frequency response based on the frequency response measurements taken in the at least two different locations in the room.

19 . The method of claim 17 , wherein the step of modifying the output of the first loudspeaker uses frequency equalization.

20 . The method of claim 17 , wherein the step of modifying the output of the first loudspeaker uses at least one of delay and phase change.

21 . The method of claim 17 , wherein the input to at least one other loudspeaker is delayed.

22 . The method of claim 17 , wherein the phase of the input to at least one other loudspeaker is changed.

23 . The method of claim 17 , wherein the plurality of loudspeakers are all subwoofers.