Shure Incorporated
4/15
*(4) 2 ft. DC power output cables are included with four-channel combiners only.
**The four-channel combiners come with (4) 22 in. BNC cables. The eight-channel combiners come with (8) 22 in. BNC cables.
Front Panels
①
Main Out Antenna Con
nector
Use the antenna supplied with the transmitter, or any other Shure passive antenna that
matches the RF operating range.
②
LED Indicators
The LED indicators on the PA421B and PA421BX display RF signal and DC current draw.
The LED indicators on the PA821B and PA821BX display RF signal only. See the section on
LED Indicators for more information.
③
Fan Vents
For system cooling.
④
Expansion Port
Connect an IEM transmitter or another combiner to share a single antenna. See the Using
Multiple Antenna Combiners with a Single Antenna section for connection information.
⑤
Power LED
Green:
Combiner is powered on
Red:
Indicates fan fault
Green/red flashing:
Maximum temperature has been exceeded
Warning!
If maximum temperature has been exceeded, attention is required. Allow the com
biner to cool. If condition persists, send the unit to Shure Service and Repair.
⑥
Power Switch
Rear Panels