Electro-Voice ULM-21 User Manual

Technical Specifications:
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General Description:
ULM-21
Miniature Cardioid Lavalier
Microphone
Key Features:
• Smooth, Natural Sound Reproduction
• Compact, Miniature, Low Profile Design
• Professional Quality and Reliability
• Durable Black Copper Case Construction
The Electro-Voice
®
model ULM-21 is a miniature cardioid,
electret condenser lavalier microphone. It is designed for
unobtrusive miking of speech and instruments, making it an
excellent choice for use in many broadcast, stage
performance, and presentation purposes. Its small size
makes the ULM-21 ideal for theatre, interviews, public
address systems, and houses of worship, utilizing its cardioid
polar pattern for high gain before feedback. The ULM-21
condenser element provides clear and natural sound
reproduction, minimizing wind noise and popping with use
of the supplied windscreen.

Electro-Voice ULM-21 Specifications

General

Brand	Electro-Voice
Model	ULM-21
Category	Microphone
Language	English

Summary

General Description

Technical Specifications

Generating Element

The microphone utilizes a back electret condenser element for sound capture.

Polar Pattern

The microphone features a cardioid polar pattern, capturing sound primarily from the front.

Open Circuit Sensitivity

Sensitivity is -52 dB relative to 1 Volt per Pascal at 1 kHz.

Impedance

The impedance is 1000 ohms, with a 20% tolerance at 1 kHz.

Self Noise

The self-noise level of the microphone is 29 dBA.

Frequency Response

The frequency response ranges from 80 Hz to 16 kHz.

Signal to Noise Ratio

The signal-to-noise ratio is 65 dB referenced at 1 Pa.

Standard Operating Voltage

The microphone operates at a standard voltage of 1.5V.

Maximum Input SPL

The maximum input sound pressure level is 120 dB at 1% THD.

Dynamic Range

The dynamic range of the microphone is 91 dB.

Cable Length and Type

Includes a 40-inch (1016mm) single conductor, shielded cable.

Connector Type

The microphone uses a TA4F connector.

Dimensions

Dimensions are 18mm x 7.4mm (0.71 x 0.29 inches).

Weight

The microphone weighs 5 grams (0.18 oz.) without the cable.

Included Accessories

Comes with a metal windscreen and a tie clip.

Frequency Response

Polar Response

Dimension Drawing

TA4F Wiring Diagram

Contact Information and Support