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The ornamental design for an audio amplifier, as shown and described.
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Portions of the audio amplifier shown in broken lines form no part of the claimed design. The audio amplifier is shown with symbolic breaks in its length in
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Jan 07 2020 | SUZUKI, WATARU | Audio-Technica Corporation | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 051845 | /0343 | |
| Feb 05 2020 | Audio-Technica Corporation | (assignment on the face of the patent) | / |
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