Shure PA421B (Combiner PSM 4UDS)

Shure PA421B Hire in Ibiza

Hire the Shure PA421B in Ibiza for concerts, festivals, touring bands, weddings and professional live productions using multiple wireless in-ear monitoring systems.

The PA421B is a professional four-input antenna combiner designed for Shure PSM transmitters.

It combines the RF outputs from up to four transmitters and feeds them into a single transmitting antenna, reducing the number of antennas required around the wireless rack.

Professional Four-Input PSM Antenna Combiner

The Shure PA421B provides four RF inputs and one combined antenna output.

It is designed to work with compatible transmitters including:

• Shure P3T
• Shure P9T
• Shure P10T
• Shure PSM 300 systems
• Shure PSM 900 systems
• Shure PSM 1000 systems

Using one correctly positioned antenna provides a cleaner and more manageable RF installation than placing several independent transmitting antennas beside one another.

Combine Four Transmitters into One Antenna

The PA421B allows up to four PSM transmitters to share one professional transmit antenna.

A typical system may include four independent in-ear mixes for:

• Lead vocalist
• Guitarist
• Bass player
• Drummer

Each transmitter continues to operate on its own coordinated frequency and carries its own monitor mix.

The combiner does not merge the audio mixes or frequencies. It only combines the RF outputs so they can use one common antenna.

Improved RF Management

Using several transmitting antennas close together can make a wireless rack more difficult to manage.

The Shure PA421B helps create a cleaner RF system by reducing the number of antenna elements and feed cables.

This provides practical advantages such as:

• One common transmitting antenna
• Cleaner wireless rack layout
• Easier antenna placement
• Reduced interaction between nearby transmitter antennas
• More controlled stage coverage
• Simplified RF cabling
• Easier troubleshooting

The complete frequency plan must still be coordinated correctly.

Wideband 470–865 MHz Operation

The PA421B operates across a wide frequency range from 470 to 865 MHz.

This allows it to work with several compatible Shure PSM frequency-band versions.

However, the individual transmitters, receivers and operating frequencies must still comply with local regulations and be mutually compatible.

The combiner does not convert one frequency band into another.

Compatible with PA805 Directional Antenna

The Shure PA421B can be connected to a directional antenna such as the Shure PA805.

The PA805 can then be positioned outside the rack and aimed towards the performance area.

This combination is particularly useful for:

• Large concert stages
• Festival stages
• Touring productions
• Wedding bands
• Theatre productions
• Corporate entertainment
• Multi-channel monitor systems

Correct antenna position and suitable low-loss 50-ohm coaxial cable remain essential.

Compatible with Other Transmit Antennas

The PA421B can also feed other compatible 50-ohm transmitting antennas covering the required frequency range.

The selected antenna must be appropriate for:

• The transmitter frequency band
• The venue layout
• The required coverage pattern
• The coaxial cable length
• The mounting position
• Local RF conditions

A directional antenna is generally useful when the performers occupy a defined stage area.

Active RF Combining

The Shure PA421B actively combines the RF outputs from multiple PSM transmitters into one antenna connection.

Active combining helps compensate for the losses that would otherwise occur when several RF signals are combined passively.

This makes it a more appropriate professional solution than using unsupported passive splitters, adapters or improvised RF connections.

The PA421B must be powered during normal operation.

RF Signal Indicators

The front panel includes an indicator for each of the four RF inputs.

The LEDs show whether an RF signal is present on the corresponding input.

The unit also includes indicators for signal presence and RF overload.

These indicators help technicians identify:

• Disconnected transmitters
• Missing RF signals
• Incorrect cabling
• Excessive input levels
• Potential system faults

The LEDs provide rapid status information during setup and operation.

Temperature-Controlled Cooling Fan

The PA421B includes a temperature-sensitive cooling fan.

The fan activates according to the internal operating temperature, reducing unnecessary noise when full cooling is not required.

This is useful in professional racks installed near:

• Stages
• Theatres
• Broadcast areas
• Recording positions
• Corporate event spaces
• Quiet technical environments

Adequate rack ventilation should still be maintained.

Expansion Port

The Shure PA421B includes an expansion port.

Shure allows up to two combiners to be daisy-chained through this connection so they can share one transmitting antenna.

This can be useful for larger monitoring systems requiring more than four transmitters.

The expansion configuration must be connected according to Shure’s instructions and tested as a complete RF system before the event.

Rack-Mount Professional Design

The PA421B is designed for installation in a professional wireless rack.

It can be combined with:

• Shure PSM transmitters
• Wireless microphone receivers
• RF distribution systems
• Antenna cables
• Network equipment
• Power distribution
• Drawer storage
• Charging equipment

Keeping the combiner and transmitters together in a rack helps organise the system and reduce setup time.

Frequency Coordination Is Still Required

An antenna combiner does not eliminate the need for professional frequency coordination.

The transmitters must be assigned frequencies that avoid:

• Intermodulation products
• Television transmissions
• Other wireless microphones
• Other in-ear systems
• Venue RF equipment
• Nearby event productions
• Local frequency restrictions

The PA421B improves RF distribution, but incorrect frequency planning can still cause interference and dropouts.

PA421B or PA821B?

The Shure PA421B is designed for up to four PSM transmitters.

The Shure PA821B is the larger alternative for systems requiring up to eight transmitter inputs.

Use the PA421B when:

• The rack contains four or fewer PSM transmitters.
• A compact four-channel system is sufficient.
• One common transmit antenna is required.

Use the PA821B when:

• Five to eight PSM transmitters must be combined.
• A larger touring or festival monitor system is being configured.
• More transmitter inputs are required in one rack unit.

PA421B or PA411?

The PA421B should not be confused with the Shure PA411.

The PA411 is specifically designed around four PSM 300 transmitters and also distributes DC power to compatible P3T units.

The PA421B is the more flexible wideband professional solution for P3T, P9T and P10T transmitters.

The exact model should be selected according to the PSM transmitters installed in the rack.

Complete PSM Combiner Hire

The Shure PA421B can be hired individually or supplied as part of a complete professional in-ear monitoring system.

Depending on the production, the package can include:

• Shure PA421B antenna combiner
• Up to four compatible PSM transmitters
• Wireless bodypack receivers
• Shure PA805 directional antenna
• Professional 50-ohm coaxial cable
• Antenna stand
• Rack power distribution
• Spare batteries
• Rechargeable battery systems
• Digital mixing console
• Independent monitor mixes
• Frequency coordination
• Delivery and installation
• On-site monitor engineer

Every combiner, transmitter, antenna and RF cable is inspected and tested before delivery.

Our technicians can also prepare the frequency plan, antenna position, transmitter routing and stage coverage according to the production requirements.

Main Shure PA421B Features

• Professional PSM antenna combiner
• Four RF transmitter inputs
• One combined antenna output
• Compatible with P3T transmitters
• Compatible with P9T transmitters
• Compatible with P10T transmitters
• Compatible with PSM 300
• Compatible with PSM 900
• Compatible with PSM 1000
• Wideband operation from 470 to 865 MHz
• Allows four transmitters to share one antenna
• RF signal indicator for each input
• RF overload indication
• Temperature-controlled cooling fan
• Expansion port
• Up to two combiners can be daisy-chained
• Suitable for professional wireless racks
• Compatible with Shure PA805 antennas
• Designed for concerts and touring productions
• Professional frequency coordination available

Hire a Shure PA421B in Ibiza

White Sound Ibiza provides professional wireless, sound and in-ear monitoring equipment hire throughout Ibiza.

Hire the Shure PA421B for a concert, festival, wedding band, corporate production or professional multi-channel PSM system.

Explore our microphone hire in Ibiza service to discover wireless systems, in-ear monitoring equipment, antennas and complete professional RF packages.

Contact our team to check availability and receive a personalised quotation.