Amplifier AF loudspeaker is an audio amplifier which can be connected in to the harness ring and used to select and amplify a radio or intercom signal. It can drive up to four fixed or free standing loudspeakers and it can also be used completely separate from the harness using an independent 24-28 volt power source. Vehicle radios that are supported in a harness are VRC-321, VRC-322, VRC-353 as well as some Clansman Man-Pack radios that are installed in vehicles with a harness. NSN: 5820-99-117-6143. Supplied in untested Grade 3 condition.