Audio Amplifier

FIG. 1 is a front perspective view of an audio amplifier; FIG. 2 is a back perspective view thereof; FIG. 3 is a front view thereof; FIG. 4 is a back view thereof; FIG. 5 is right side view thereof; FIG. 6 is left side view thereof; FIG. 7 is a top view thereof; and, FIG. 8 is a bottom view thereof. The stylized “B” forming part of the claimed design is a registered trademark of Lenbrook Industries Limited, the Applicant. The broken lines in the figures depict portions of the audio amplifier that form no part of the claimed design.