Description
The Shure PA421B Four-Channel Antenna Combiner is a high-performance RF management solution designed to streamline and optimize multi-channel in-ear monitoring systems. Built for professional audio environments, it efficiently combines up to four wireless transmitters into a single antenna system, reducing rack clutter while improving signal integrity and minimizing intermodulation distortion.
Engineered for reliability and clean RF performance, the PA421B operates across a wide 470–865 MHz frequency range, making it ideal for demanding live sound, broadcast, and installed AV applications. Integrated DC power outputs simplify system deployment by powering compatible transmitters directly, while LED indicators provide real-time monitoring of signal status, overload conditions, and current draw.
With support for daisy-chaining multiple units and a rugged rackmount design, the PA421B ensures scalable, organized, and interference-free wireless operation for professional audio engineers and integrators.
| Specification | Details |
|---|---|
| Product Type | Four-Channel Antenna Combiner |
| Frequency Range | 470–865 MHz |
| RF Inputs | 4 x BNC (Active) |
| RF Output | 1 x BNC |
| Expansion Port | 1 x BNC (Passive, Daisy-Chain Capable) |
| Impedance | 50 Ohms |
| RF Gain | 0 dB (±2 dB) |
| RF Input Detection Threshold | 2.5 dBm |
| RF Overload Threshold | Greater than 24 dBm |
| Expansion Port Insertion Loss | Less than 4 dB |
| RF Expansion Port Max Input | 33 dBm (2 W) |
| DC Outputs | 4 x 15 V DC |
| Output Current per Port | Up to 660 mA |
| Output Power per Port | 9.9 W |
| Power Requirements | 100 to 240 V AC, 50–60 Hz |
| Power Consumption | Up to 98 W |
| Current Draw | 1.09 A at 100 V AC |
| Operating Temperature | -18°C to 63°C (0°F to 145°F) |
| LED Indicators | Signal Presence, Overload, Current Draw |
| Rack Compatibility | Standard 19-inch Rackmount |
| Included Accessories | IEC Power Cord, DC Power Cables, Coaxial Cables |
| Application | Wireless IEM RF Management |
| Compliance | TAA Compliant |
Payment & Security
Your payment information is processed securely, and we do not store credit card details or access your credit card information.
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
