Description
The Shure PA421BX is a professional-grade four-channel antenna combiner engineered to streamline RF management in complex in-ear monitoring setups. Designed for high-performance wireless environments, it allows up to four compatible PSM transmitters to share a single antenna, significantly reducing rack clutter while improving overall RF efficiency.
Operating in the 865–960 MHz frequency range, the PA421BX delivers stable, wideband performance ideal for touring, broadcast, and installed AV systems. Its advanced design minimizes intermodulation artifacts, ensuring a cleaner RF environment and more reliable signal transmission. Integrated DC power outputs simplify system cabling by powering connected transmitters directly, while LED indicators provide real-time monitoring of signal presence, overload conditions, and current draw.
With expansion capabilities for larger systems and an improved thermal design for quiet operation, the PA421BX is a dependable solution for professional audio engineers seeking scalable and efficient wireless system management.
| Specification | Details |
|---|---|
| Frequency Range | 865–960 MHz |
| RF Channels | Combines up to four transmitters |
| Impedance | 50 Ω |
| RF Input Connector | BNC (Active) |
| RF Output Connector | BNC |
| RF Gain | 0 dB (±2 dB) |
| Expansion Port | BNC (Passive), supports daisy-chaining |
| Expansion Port Insertion Loss | <4 dB |
| RF Expansion Port Range | 33 dBm (2 W) |
| DC Output Voltage | 15 V DC |
| DC Output Current (Per Output) | Up to 660 mA |
| DC Output Power (Per Output) | 9.9 W |
| LED Indicators | Signal presence, overload, current draw |
| Detection Threshold | 2.5 dBm (signal), 85 mA (current) |
| Overload Threshold | >24 dBm (RF), >660 mA (current) |
| Power Requirements | 100–240 V AC, 50–60 Hz |
| Power Consumption | 98 W maximum |
| Current Drain | 1.09 A at 100 V AC |
| Operating Temperature | −18°C to 63°C (0°F to 145°F) |
| Included Accessories | IEC power cord, DC power cables, BNC coaxial cables |
| Compatibility | Shure PSM Personal Monitor 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
