Stellar Sounds CM-4
Multi-Pattern Tube Condenser Microphone
The CM-4 was an early multipattern tube microphone from Stellar Sounds. Based on a Chinese bottle-style body, the mic was a three-pattern, large-diaphragm condenser with a transformer-coupled output.
The tube amplifier circuit was based on the 6J1 vacuum tube, described as “specially selected.” The 6J1 is a pentode, manufactured in China, is equivalent to the EF95 and 6AK5.
A switch on the front of the microphone body allowed selection of Cardioid, Omnidirectional, or Figure-8 polar patterns. Two switches on the rear optionally enable a high-pass filter or a -10dB pad.
Photo credit: Sacha Müller
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Specifications
| Pickup Patterns | Pads & Filters |
|---|---|
|
Omnidirectional
(14.1 mV/Pa; 20 - 20,000 Hz) Cardioid (14.1 mV/Pa; 20 - 20,000 Hz) Bidirectional (14.1 mV/Pa; 20 - 20,000 Hz) |
|
| Capsule Dimensions | Impedance | SPL/Noise |
|---|---|---|
| Diaphragm diameter: 27mm Capsule diameter: 34mm |
200 Ohms (Low) | Max SPL: 148 dB Self-noise: 18.0 dB(A) |
| Weight | Length | Max Diameter | Interface(s) |
|---|---|---|---|
| n/a | 233mm (9.17'') | 65mm (2.56'') |
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| Power Specifications |
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