Take total control over your amplifiers from a remote location.The ACD1 Amplifier Control Device provides a convenient, reliable means to connect a computer running Yamaha's advanced Amp Editor amplifier control and monitoring software to Yamaha Tn, PC-1N, XP, XM and XH series power amplifiers. A single unit of ACD1 allows you to remotely control and monitor up to 40 amplifiers, saving time consuming trips to and from amp racks, while providing you with necessary amplifier status information so you know how your amplifiers are doing every second of your show.