Description
The Shure PA421BX Antenna Combiner is engineered to streamline RF management in professional in-ear monitoring systems, delivering clean, efficient signal distribution for up to four transmitters through a single antenna. Designed for high-performance wireless environments, this unit minimizes intermodulation distortion and reduces rack clutter, making it ideal for touring, broadcast, and large-scale AV installations.
Operating within the 865–960 MHz frequency range, the PA421BX ensures stable and reliable RF performance while supporting daisy-chaining for expanded system scalability. Built-in DC power distribution simplifies setup by powering compatible transmitters directly, reducing the need for additional cabling. With improved thermal efficiency and low-noise operation, this combiner maintains consistent performance even in demanding conditions.
Its robust design, clear LED indicators, and flexible integration capabilities make the PA421BX a dependable solution for optimizing wireless audio systems with precision and reliability.
| Specification | Details |
|---|---|
| Frequency Range | 865 to 960 MHz |
| Supported Channels | Combines up to four transmitters |
| RF Input Connector | BNC |
| RF Input Configuration | Active |
| RF Input Impedance | 50 ohms |
| RF Gain | 0 dB (±2 dB) |
| Main Output Connector | BNC |
| Main Output Impedance | 50 ohms |
| Expansion Port | BNC, passive configuration |
| Expansion Capability | Supports daisy-chaining of up to two combiners |
| Expansion Port Insertion Loss | Less than 4 dB |
| RF Expansion Port Range | Up to 33 dBm (2 W) |
| DC Output Voltage | 15 V DC |
| DC Output Current | Up to 660 mA per output |
| DC Output Power | Up to 9.9 W per output |
| LED Indicators | Signal presence, overload, and current draw monitoring |
| Power Requirements | 100 to 240 V AC, 50–60 Hz |
| Power Consumption | Maximum 98 W |
| Current Draw | 1.09 A at 100 V AC |
| Operating Temperature | -18°C to 63°C (0°F to 145°F) |
| Impedance | 50 ohms throughout system |
| Cooling Design | Enhanced low-noise fan for improved thermal efficiency |
| Included Accessories | IEC power cord, DC power cables, BNC coaxial cables |
| Application | RF signal combining for in-ear monitoring systems |
Payment & Security
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Return Policy (Short Summary)
We offer a 30-day return window for most unopened, factory-sealed items.
Returns must be authorized before shipping back and must include all original packaging and accessories. Opened or used items are not returnable unless defective.
Some products—such as custom orders, special-order items, audio gear, software, and LED video walls—are non-returnable. Non-defective returns may be subject to a 20–30% restocking fee, and customers are responsible for return shipping costs.
For damaged or incorrect items, please contact us immediately.
From Scope to Sign-Off
A structured delivery process designed to reduce risk and keep projects moving.
Plan
Discovery, site review, requirements gathering, and project alignment. We define scope, constraints, and success criteria before any design work begins.
- Discovery calls & stakeholder interviews
- On-site survey & infrastructure review
- Requirements & use-case documentation
- Project scope, timeline & milestone alignment
Engineer
System design, schematics, signal flow, BOM development, and documentation. Every project leaves this phase with a complete engineering package.
- AV system design & signal flow diagrams
- Equipment selection & BOM development
- Rack layout & control system design
- As-built documentation package
Deploy
Procurement, logistics, installation, programming, commissioning, and training. We own the delivery from first shipment to final handoff.
- Authorized procurement & logistics coordination
- Physical installation & cable management
- Control system programming & configuration
- Commissioning, testing & end-user training
Support
Monitoring, maintenance, lifecycle planning, and long-term service agreements. We stay engaged long after project close.
- 24/7 remote system monitoring
- Preventive & reactive maintenance
- Technology lifecycle & refresh planning
- Long-term service level agreements
A decade of delivery — trusted by 275+ clients across industries
