1901 SW 101 AVE Miramar FL 33025

Shure PA421B Antenna Combiner

Four-to-One Wideband PSM Antenna Combiner for all P9T and P10T Transmitters (470-865 MHz)

PA421B Antenna Combiners are complementary accessories for Shure PSM® Personal Stereo Monitor systems. When multiple systems are required for monitoring applications, the PA421B combiners quietly and efficiently optimize RF management for up to four PSM® transmitter, while also reducing rack clutter. (Directly replaces PA421A.)

The PA421B is compatible with Shure PSM 900 and PSM 1000.


  • Combines up to four PSM transmitters to a single antenna set for improved RF networking & reduced rack clutter.
  • Wideband operation (470-865 MHz)
  • 4 Input LED signals (green when active; off when inactive)
  • Quieter, temperature-sensitive fan for significant reductions in ambient unit noise and heat
  • Daisy-chain up to 2 combiners with the expansion port.
  • LED indicators for signal presence and signal overload
  • Passive (non-powered) antenna combining*