(Based on Use) Racks and mounts adapted for audio equipment, namely, 500-series rack-mountable enclosures for audio apparatus (Based on Intent to Use) Professional audio electronic components and analog sound control equipment, namely, amplifiers in the nature of direct injection re-amplifiers, instrument direct injection pre-amplifiers, microphone pre-amplifiers, line pre-amplifiers, audio processing equipment in the nature of compressors, limiters, gates, equalizers, analog audio frequency ...