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The Advanced Audio CM47 is a large dual-diaphragm, multi-pattern, tube condenser microphone inspired by the famous Neumann U-47. The CM47 is a great choice for vocals, saxophones, acoustic instruments, and excels in front of bass and guitar amps.
The Advanced Audio CM47 features our very accurate and smooth AK67 capsule, a 35mm capsule with 6-micron-thick German mylar diaphragms. Its frequency response falls between those of the U47 and U67 vintage tube microphones. The AK67 capsule goes down another ½ octave before rolling out, compared to the K47 capsule. The CM47 also has more “air” or “sizzle” above 10 kHz, allowing it to cut more easily through busy mixes without the addition of EQ.
The circuit is designed around the very HiFi 6072 tube and optimized with a two-stage Class A CCDA circuit. This circuit provides a much lower output impedance with more headroom than the original circuit used in the original U47. The lower output impedance provides a faster damping factor when driving the BV8 type transformer, delivering a better transient response than the original design.
Selected 6072a tubes are some of the quietest tubes made, and are much less susceptible to microphonics than the metal-clad vf14 tubes used in the original U47 tube microphone. The dual-bobbin output transformer with its hum bucking configuration and our optimized circuit will deliver >+14 dBu with less than 1% distortion.
The output transformer is driven with a 2.2 ufd metal-film capacitor to take advantage of the transformer’s response down below 20 Hz.
|Package Contents||CM47 mic, shock mount, and aluminum road case|
|Tube or Solid State||Tube|
|Number of Microphones||Single Microphone|
|Impedance||<200 Ohms (load impedance <1.2 kOhms)|
|Frequency Range||20 Hz - 20 kHz (±3 dB)|
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