RDL DB-TPA1A Decora Mount 3.5-Watt Format-A Headphone Amplifier (Black) - Custom Engraving OptionThe TPA1A modules are two pair audio amplifier modules compatible with RDL Format A twisted pair products. Each TPA1A receives stereo audio and 24 Vdc power through a rear panel RJ45 jack. The left and right audio signals received on pairs B and C of the twisted pair cable are summed to mono and amplified. The amplified output level is set by an internal VCA which is controlled by a front panel volume control. The VCA attenuator provides years of
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