Shure RPM181/BI: Bidirectional Capsule for Beta 181 Microphone
Model
:
RPM181/BI
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Shure RPM181/BI Bidirectional Capsule
The Shure RPM181/BI bidirectional (figure 8) capsule swaps directly onto a Beta 181 modular microphone body, tuned for mono drum overheads and dual instrument sound source applications. Studios and touring engineers across Dubai, Abu Dhabi, and the UAE and GCC rely on the Beta 181 system's interchangeable capsules to reconfigure one mic body for multiple sources.
Key Features
- Bidirectional (figure 8) polar pattern for front and rear pickup
- Wide dynamic range and high SPL handling
- No crossover distortion, exceptional low frequency reproduction
- Locking ring for a secure connection to the Beta 181 body
- Steel grille protects the capsule from impact damage
Technical Specifications
| Type | Condenser |
| Polar Pattern | Bidirectional |
| Frequency Response | 20 Hz to 20,000 Hz |
| Sensitivity | -51.0 dBV/Pa (2.6 mV) |
| Maximum SPL | 153.5 dB (1k ohm), 156.0 dB (2.5k ohm) |
| Dynamic Range | 130.5 dB (1k ohm), 133.0 dB (2.5k ohm) |
| Signal to Noise Ratio | 71.0 dB |
| Power Requirements | 11-52 V DC phantom (IEC-61938), 2.4 mA max |
| Weight | 5.1 oz (145 g) |
Why Buy the Shure RPM181/BI from Trianze Tech?
- Genuine Shure replacement capsules sourced through authorized channels
- Fast delivery across Dubai, Abu Dhabi, and the wider UAE and GCC
- Expert advice matching the correct Beta 181 capsule pattern to your source
Frequently asked
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Talk to a consultant — most queries are answered in a 15-minute call.
The RPM181/BI bidirectional (figure 8) capsule for the Beta 181 is ideal for mono drum overheads and dual instrument sound source applications where front and rear pickup with side rejection is needed.
The RPM181/BI handles up to 153.5 dB SPL on a 1000 ohm load (156.0 dB on 2500 ohm), with a sensitivity of -51.0 dBV/Pa and a dynamic range of 130.5 dB.
Yes. The RPM181/BI requires 11 to 52 V DC phantom power per IEC-61938, drawing 2.4 mA maximum, the same as the other Beta 181 interchangeable capsules.
The RPM181/BI attaches via a locking ring for a secure connection, protected by a steel grille that shields the capsule during dual source and overhead recording setups.
The RPM181/BI weighs 5.1 oz (145 grams), a lightweight design with an integrated preamp for the Beta 181 modular microphone system.
Trianze Tech stocks the Shure RPM181/BI bidirectional capsule for the Beta 181 in Dubai with fast delivery across the UAE and GCC. Call +971 58 161 3661 or message us on WhatsApp for the best price and current stock availability.