Shure RPM181/C – Cardioid Capsule for Beta 181 Microphone

Product Overview

The Shure RPM181/C is the cardioid replacement capsule for the Beta 181 small-diaphragm side-address condenser microphone, designed for broadcast studios, recording facilities, performing arts venues, and house of worship installations that require front-address cardioid pickup in a compact, close-placement microphone body. It is ideal for drum overhead, piano, and acoustic instrument applications where controlled directional pickup and rejection of off-axis sound are priorities. The capsule attaches directly to any Beta 181 body, allowing AV system designers to build a versatile microphone inventory from a single hardware platform.

Product Description

The cardioid pattern of the RPM181/C provides front-of-source pickup with side and rear rejection suited to miking individual instruments in dense stage or recording configurations—drum overheads, piano lids, acoustic guitar in multi-instrument sessions, and orchestral section miking. The Beta 181 capsule system enables facilities to maintain multiple polar pattern options from a single microphone body investment, reducing hardware overhead in performing arts organizations, broadcast studios, and commercial recording rooms. The capsule is installed without tools, allowing engineers and technicians to reconfigure microphones between sessions or performance setups. The RPM181/C is one of four capsule options available for the Beta 181 platform (bidirectional, cardioid, omnidirectional, and supercardioid).

Key Features

• Cardioid Polar Pattern — Provides controlled front-of-source pickup with rear and side rejection, suited to drum overhead, piano, and acoustic instrument placement in professional recording and reinforcement.
• Beta 181 Capsule System Compatibility — Mounts directly to any Beta 181 microphone body without tools, enabling fast changeover between polar pattern configurations.
• Small-Diaphragm Side-Address Design — The compact Beta 181 form factor allows close placement in physically constrained instrument positions.
• Consistent Textbook Polar Response — Maintains accurate cardioid directional behavior across the frequency range for predictable, repeatable placement in professional environments.
• Multi-Pattern Platform — Works alongside RPM181/BI, RPM181/O, and RPM181/S capsules, giving a single Beta 181 body four polar pattern options.
• Studio and Live Sound Application — Designed for both commercial recording and live reinforcement deployments in performing arts venues, broadcast studios, and houses of worship.

Typical Applications

• Drum overhead in studio recording and live reinforcement
• Piano and acoustic instrument close miking in broadcast studios
• Orchestral and ensemble miking in auditorium and performing arts venues
• House of worship instrument microphone installations
• Multi-purpose room and training room instrument capture

Technical Specifications

Frequently Asked Questions

Which microphone body does the RPM181/C fit?

The RPM181/C is designed exclusively for the Shure Beta 181 side-address condenser microphone body and is not compatible with other Shure microphone platforms.

What are the best applications for the cardioid capsule?

According to Shure, the cardioid capsule is ideal for drum overhead, piano, and acoustic instrument applications where controlled front-of-source pickup and rear rejection are required.

Can I use multiple capsule types with the same Beta 181 body?

Yes. The Beta 181 capsule system allows a single body to accept any of the four available capsule options (cardioid, supercardioid, omnidirectional, bidirectional), making it a versatile investment for facilities with diverse miking requirements.

Does the RPM181/C require phantom power?

Yes. As a condenser capsule, the RPM181/C requires 48V phantom power from the connected preamp or mixing console.