Shure BETA 181/BI – Side-Address Bidirectional Condenser Microphone

Product Overview

The Shure BETA 181/BI is an ultra-compact side-address bidirectional condenser microphone designed for stereo techniques and dual-source capture. Its figure-8 capsule and side-address form make it a practical choice for Blumlein and mid-side stereo recording, as well as miking two sources at once. As part of the interchangeable-capsule BETA 181 system, the bidirectional capsule delivers a consistent, textbook polar response. For AV system designers specifying a small-diaphragm condenser microphone for studio recording, the BETA 181/BI combines high-SPL handling with a low-profile footprint.

Product Description

The BETA 181/BI pairs a compact preamplifier with a bidirectional condenser capsule that attaches by way of an innovative locking ring. The side-address design, under 12 cm in length, supports discreet positioning and reduces stage clutter. As a high-SPL condenser microphone, it offers a wide dynamic range and exceptional low-frequency reproduction with no crossover distortion. The figure-8 pattern picks up equally from front and rear while rejecting sound at the sides, which makes it well suited to mid-side stereo when paired with a cardioid capsule and to capturing dual sound sources such as facing tom-toms. The transformer output and integrated XLR connection simplify integration with any phantom-powered console. Comparable Shure options on our catalog include the BETA 181/C cardioid model and the BETA 181/KIT four-capsule set.

Key Features

• Bidirectional Capsule — The figure-8 capsule captures equally from front and rear with side rejection, ideal for stereo techniques and dual-source miking.
• Stereo Technique Ready — The capsule pairs with a cardioid 181/C for mid-side recording or with a second 181/BI for Blumlein stereo.
• Ultra-Compact Side-Address Form — At under 12 cm, the side-address body fits tight placements and reduces stage clutter.
• Interchangeable Capsule System — The preamp accepts cardioid, supercardioid, omnidirectional, and bidirectional capsules for flexible deployment.
• Locking Ring Connection — An innovative knurled locking ring provides a secure, repeatable connection between capsule and preamplifier.
• Wide Dynamic Range — High-SPL handling and exceptional low-frequency reproduction suit demanding studio and stage sources.
• Durable Build — A hardened steel mesh grille resists denting and wear in touring and studio use.

Typical Applications

• Broadcast Studio — Mid-side and Blumlein stereo capture for live music television and streaming production.
• Auditorium — Stereo room and ensemble pickup on performance stages where sightlines matter.
• House of Worship — Discreet stereo capture of choirs and acoustic ensembles.

Technical Specifications

Competitor Comparison

This comparison reflects general product positioning. Competing model specifications should be verified against each manufacturer's current documentation before purchase.

Frequently Asked Questions

What stereo techniques does the 181/BI support?
The figure-8 capsule pairs with a cardioid 181/C for mid-side (M/S) recording, or with a second 181/BI for Blumlein stereo.

What phantom power does it require?
It requires 11 to 52 V DC phantom power per IEC-61938 and performs best at 48 V DC, drawing up to 2.4 mA over a balanced XLR cable.

Can I change the polar pattern?
Yes. The capsule is interchangeable; the bidirectional capsule can be swapped for cardioid, supercardioid, or omnidirectional capsules on the same preamp using the knurled locking ring.

How does the side-address form help integration?
The compact side-address body, under 12 cm, allows discreet placement in tight positions while keeping sightlines clear.

What warranty and support apply?
Shure microphones carry the manufacturer's standard limited warranty. Creation Networks can assist with warranty registration, integration questions, and replacement capsules such as the RPM181/BI.