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Ear Trumpet Labs Josephine

Pricing & Availability

  • MSRP: $599


Josephine Documentation

CardioidEar Trumpet Labs Josephine

Cardioid Condenser Microphone

The Josephine is a medium-large diaphragm (26mm) condenser microphone designed for live vocal and ensemble use.
The design features a spherical stainless steel mesh headbasket spring-suspended in a large copper ring. The sculptural design is reminiscent of early broadcast microphones, and is made largely from standard hardware elements.

The headbasket uses silk and foam for blast filtering, and Sorbothane for shock and vibration damping to minimize handling noise.

The capsule is an imported electret condenser (TSB-2555) with additional acoustic damping. Capsules are individually tested and selected; roughly 30% of capsules are rejected for not meeting design criteria.

The impedance conversion circuit is a transformerless FET design, built with high-grade components including metal film resistors, polypropylene and polystyrene capacitors, and individually tested, hand-matched and biased transistors and JFETs.

The circuit includes moderate bass rolloff to compensate for proximity effect, and high frequency EQ to avoid harshness and help control feedback.

Ear Trumpets Press Release
The cardioid polar pattern, headbasket design, and tuned electronics all work together to make a very stable live mic with an extremely natural sound and good feedback rejection. Josephine is optimized for use by singers or acoustic ensembles from 6 inches to 48 inches away. The styling, form-factor, and sound are ideal for period swing or jazz vocalists or single-mic techniques with bluegrass or traditional musicians, with significantly better feedback rejection than the LDCs typically used in these applications.

In 2016, the microphone had a cosmetic design update, where the 8” copper mounting ring was changed to a 6” copper mounting ring. All internal components were left unchanged.

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Frequency Response - CardioidClick Graph to Compare!
Josephine Cardioid Frequency Response Chart
Pickup Patterns Pads & Filters
Cardioid (12 mV/Pa; 20 - 18,000 Hz)
Capsule Dimensions Impedance SPL/Noise
Diaphragm diameter: 21mm
Capsule diameter: 26mm
Diaphragm gauge: 6 microns
150 Ohms (Low) Self-noise: 23.0 dB(A)
Weight Length Max Diameter Interface(s)
n/a 362mm (14.25'') 60mm (2.36'')
  • 3-pin XLR male (1)
Power Specifications
  • Requires phantom power
  • Phantom voltage: 48v

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