Aiphone PD-2 Paging/Talkback Adaptor

Overview

The Aiphone PD-2 is a dedicated interface adaptor that connects handset stations (TD-H and TB-H/B series) to standalone paging amplifiers and overhead PA systems. It solves the integration problem: your handset system needs to feed audio into an existing amplified speaker network while maintaining clean audio levels and automatic muting of background music during announcements. The PD-2 handles both paging transmission (from handset to amp) and talkback gain management (return audio from music sources back to the handset).

Compatibility

The PD-2 works with Aiphone TB-H/B and TD-H handset platforms. It connects to integrated paging amplifiers including the MD120M, MD60M, and MD35M series. Output impedance is 5KΩ at 1.5V maximum, which means it will properly load amplifier inputs in the 10KΩ or less range without signal degradation. AUX or PHONO input sources are supported (100K–500KΩ input impedance, 0.12V–0.5V nominal). Music input tuner output delivers 100mV–1.2V at 10KΩ or less, enabling automatic source switching during paging announcements.

Installation Notes

Two shielded cables are required: use Aiphone #822202 (2-conductor, overall shield) for the adaptor-to-amplifier connection, and Aiphone #822203 (3-conductor, overall shield) for the adaptor-to-master station connection. Shielding is critical — unshielded runs will introduce hum and noise into the paging path. Talkback gain is fixed at 40dB at 1KHz maximum volume; this spec prevents feedback squeal while delivering adequate return-audio level to the handset earpiece. Environmental noise from the phono input stays below 80dB, meeting typical commercial intercom noise floors.