Shure antenna combiners actively combine RF outputs from multiple wireless IEM transmitters to a single antenna, improving RF performance and conserving rack space.
Shure antenna combiners for Shure IEM wireless personal monitoring systems are available in four-channel and eight-channel rackmountable configurations.
|Model||Frequency Range||RF Inputs||DC Power Outlets|
The antenna combiners are available in two frequency ranges. The RF inputs allow up to four or eight (model dependent) IEM systems to share a single antenna. The DC power outlets and supplied power cables allow you to distribute power to up to four compatible IEM systems without requiring external power supplies.
*(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.
|① Main Out Antenna Connector||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 combiner to cool. If condition persists, send the unit to Shure Service and Repair.
|⑥ Power Switch|
|① Power Input||Connects unit to AC power.|
|② Exhaust Air Vents||For system cooling.|
|③ DC Power Outputs||Available on the PA421B and PA421BX models for powering compatible transmitters|
|④ RF Inputs||
PA421B: Connect up to 4 IEM transmitter outputs
PA821B: Connect up to 8 IEM transmitter outputs
The top 4 RF LED indicators display input signal presence.
The bottom 4 LEDs indicate current draw for each DC output.
PA421B and PA421BX
The PA821B and PA821BX antenna combiners allow up to 8 transmitters to share a single antenna. RF LED indicators display input signal presence.
PA821B and PA821BX
Note: A minimum of RF signal is required to activate the channel. See Specifications page for more information.
Note: Use external power supplies or an optional power distribution cable to supply power to additional transmitters. The PA821B and PA821BX combiners do not supply DC power.
43 x 401 x 365 mm (1.7 x 15.8 x 14.4 in.), H x W x D
|PA421B, PA421BX||4.3 kg (9.5 lbs)|
|PA821B, PA821BX||4.8 kg (10.5 lbs)|
-18°C (0°F) to 63°C (145°F)
100 to 240 V AC, 50-60 Hz
|PA421B, PA421BX (referenced at 100 V AC)||1.09 A (109 VA)|
|PA821B, PA821BX (referenced at 100 V AC)||1.59 A (159 VA)|
|PA421B, PA421BX||98 W max.|
|PA821B, PA821BX||143 W max.|
0 dB (±2 dB)
up to +20 dBm max., protected up to +24 dBm
15 V DC
660 mA max.
*PA421B and PA421BX only
**PA821B and PA821BX only
***IEC power cord comes standard. Some regions come with multiple cords.
Shure offers antenna cables ranging from 6 to 100 feet.
The Shure Wireless Accessory Wizard is a resource to help determine the correct RF accessories for your wireless system. You provide basic information about your setup and receive item recommendations and connection diagrams.
Go to https://www.shure.com/en-US/support/tools/wireless-accessory-wizard to access the Wireless Accessory Wizard.
|This symbol indicates that dangerous voltage constituting a risk of electric shock is present within this unit.|
|This symbol indicates that there are important operating and maintenance instructions in the literature accompanying this unit.|
Waste Electrical and Electronic Equipment (WEEE) Directive
In the European Union and the United Kingdom, this label indicates that this product should not be disposed of with household waste. It should be deposited at an appropriate facility to enable recovery and recycling.
Federal Communications Commission RF Exposure Notice:
Antennas used for the purpose of radiating signals are limited to a maximum gain of 14 dBi. Each antenna must be positioned to observe minimum separation requirements from all users and bystanders. The following guidelines should be used when considering separation distances.
Antennas must be placed such that, under normal conditions, personnel cannot come within 72 cm (~2.5 ft.) from any antenna. Adhering to this minimum separation will ensure that the employee or bystander cannot exceed RF exposures beyond the maximum permissible limit as defined by 47 CFR 1.1310, i.e., limits for General Population/Uncontrolled Exposure.
WARNING: Voltages in this equipment are hazardous to life. No user-serviceable parts inside. Refer all servicing to qualified service personnel. The safety certifications do not apply when the operating voltage is changed from the factory setting.
Note: Use only with the included power supply or a Shure-approved equivalent.
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the manufacturer's instruction manual, may cause interference with radio and television reception.
Notice: The FCC regulations provide that changes or modifications not expressly approved by Shure Incorporated could void your authority to operate this equipment.
These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions:
The equipment is intended to be used in professional audio applications.
For information regarding responsible party and other matters relating to FCC compliance, please contact Shure Incorporated, 5800 W. Touhy Avenue, Niles, Illinois 60714-4608 U.S.A. shure.com/contact
Registration, Evaluation, Authorization of Chemicals (REACH) Directive
REACH (Registration, Evaluation, Authorization of Chemicals) is the European Union (EU) and the United Kingdom (UK) chemical substances regulatory framework. Information on substances of very high concern contained in Shure products in a concentration above 0.1% weight over weight (w/w) is available upon request.
Please consider the environment, electric products and packaging are part of regional recycling schemes and do not belong to regular household waste.
Licensing: A ministerial license to operate this equipment may be required in certain areas. Consult your national authority for possible requirements. Changes or modifications not expressly approved by Shure Incorporated could void your authority to operate the equipment. Licensing of Shure wireless microphone equipment is the user’s responsibility, and licensability depends on the user’s classification and application, and on the selected frequency. Shure strongly urges the user to contact the appropriate telecommunications authority concerning proper licensing, and before choosing and ordering frequencies.
Conforms to electrical safety requirements based on IEC/EN 62368-1.
Certified under FCC Part 74.
Certified by ISED in Canada under RSS-123.
FCC ID: DD4PA421B. IC: 616A-PA421B.
FCC ID: DD4PA421BX. IC: 616A-PA421BX.
FCC ID: DD4PA821B. IC: 616A-PA821B.
FCC ID: DD4PA821BX. IC: 616A-PA821BX.
This Class B digital apparatus complies with Canadian ICES-003. Cet appareil numérique de la classe B est conforme à la norme NMB-003 du Canada.
This product meets the applicable Innovation, Science and Economic Development Canada technical specifications. Certified by ISED in Canada under RSS-247 and RSS-GEN.
This device contains licence-exempt transmitter(s)/receiver(s) that comply with Innovation, Science and Economic Development Canada’s licence-exempt RSS(s). Operation is subject to the following two conditions:
L’émetteur/récepteur exempt de licence contenu dans le présent appareil est conforme aux CNR d’Innovation, Sciences et Développement économique Canada applicables aux appareils radio exempts de licence. L’exploitation est autorisée aux deux conditions suivantes :
CE Notice: Hereby, Shure Incorporated declares that this product with CE Marking has been determined to be in compliance with European Union requirements. The full text of the EU declaration of conformity is available at the following site: https://www.shure.com/en-EU/support/declarations-of-conformity.
Authorized European importer:
Shure Europe GmbH
Department: Global Compliance
75031 Eppingen, Germany
Phone: +49-7262-92 49 0
Fax: +49-7262-92 49 11 4
UKCA Notice: Hereby, Shure Incorporated declares that this product with UKCA Marking has been determined to be in compliance with UKCA requirements. The full text of the UK declaration of conformity is available at the following site: https://www.shure.com/en-GB/support/declarations-of-conformity.
UK Importer / UK Rep.
Shure UK Limited
Unit 2, The IO Centre, Lea Road,
Waltham Abbey, Essex, EN9 1 AS,