Shure RPM181/S – Supercardioid Capsule for Beta 181 Microphone

Product Overview

The Shure RPM181/S is the supercardioid replacement capsule for the Beta 181 small-diaphragm side-address condenser microphone, suited to close-microphone applications that require tighter directional pickup and greater off-axis rejection than a standard cardioid pattern provides. It is the preferred capsule for snare drum, individual tom, and close-proximity acoustic instrument applications in live reinforcement and commercial recording environments. The RPM181/S installs directly on any Beta 181 body without tools and is part of the four-capsule Beta 181 interchangeable system.

Product Description

The supercardioid pattern offers a narrower pickup angle than cardioid, with increased rejection at the sides and small rear lobes that reject monitor bleed and ambient noise in demanding live and studio environments. For AV system designers and sound engineers specifying microphones for drum kits, busy stage plots, or multi-instrument recording sessions in commercial facilities, the RPM181/S provides the isolation and proximity performance of the full Beta 181 condenser platform in a tightly controlled directional configuration. It is applicable in houses of worship where stage monitor placement requires tight rejection, performing arts venues with complex instrument configurations, and broadcast studios requiring close-source isolation. Used alongside the RPM181/BI, RPM181/C, and RPM181/O, the supercardioid capsule completes the full polar pattern capability of the Beta 181 system from a single microphone body.

Key Features

• Supercardioid Polar Pattern — Provides tighter front-of-source pickup than cardioid, with greater side rejection suited to snare drum, tom, and close-source acoustic instrument miking in demanding live and studio environments.
• Beta 181 Capsule System Compatibility — Mounts to any Beta 181 body without tools for fast polar pattern changeover between sessions or setups.
• Tighter Directional Control — The narrower pickup angle provides increased isolation in dense stage configurations and multi-instrument recording sessions.
• Small-Diaphragm Side-Address Design — The compact Beta 181 body enables close placement on physically restricted sound sources such as snare drums and acoustic instruments.
• Live and Studio Deployment — Designed for both commercial recording and live reinforcement use in performing arts venues, houses of worship, and broadcast studios.
• Completes the Four-Capsule Beta 181 System — Works alongside RPM181/BI, RPM181/C, and RPM181/O to provide a full polar pattern toolkit from a single microphone body.

Typical Applications

• Snare drum and tom miking in live reinforcement and studio recording
• Close-proximity acoustic instrument miking in commercial recording rooms
• House of worship stage miking with monitor rejection requirements
• Performing arts venue instrument close-miking
• Broadcast studio acoustic instrument recording

Technical Specifications

Frequently Asked Questions

What is the primary application for the supercardioid capsule?

According to Shure, the RPM181/S is ideal for snare drums, acoustic instruments, and other close-microphone applications where tighter directional control and greater side rejection than a cardioid pattern are needed.

How does the supercardioid pattern differ from cardioid in a live sound context?

The supercardioid has a narrower pickup angle and greater side rejection, which provides better isolation from adjacent sound sources and stage monitor bleed in busy live reinforcement environments.

Is this capsule compatible with all Beta 181 preamplifier bodies?

Yes. The RPM181/S is compatible with any Beta 181 preamplifier body (including the RPM181/PRE replacement) and other RPM181-series capsules.

Does the RPM181/S require phantom power?

Yes. The Beta 181 is a condenser microphone system that requires 48V phantom power from the connected preamp or mixing console.