RK-12 Microphone Capsule


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The RK-12 is an edge-terminated capsule designed to capture the sound of the famed AKG CK-12 capsule.

It can be used as a direct swap for your AKG C12, and is a great choice for DIY C12 or ELA M 251 projects.

It’s also a recommended upgrade for inexpensive tube condenser microphones like the Apex 460, Alctron T-11A, and more.

The RK-12 is a nice-sounding capsule designed to deliver the performance of an AKG CK12 capsule and is manufactured in China. Compared to the original CK12 from AKG, it is a respectable performer with a slightly smoother high-frequency boost, and to a lesser effect, a slight low-frequency boost.

The RK-12 features 3-micron gold-sputtered mylar and supports both cardiod-only and multi-pattern microphone circuits.

What’s Included

  • RK-12 microphone capsule
  • Mounting post and saddle
  • Screws for the saddle

Technical Specifications

  • Polar pattern: multi-directional (cardiod, figure 8, omni)
  • Frequency response:
  • Sensitivity: -38dB ±2dB (0dB = 1V/Pa at 1kHz)
  • Output impedance: 200Ω ±30% at 1kHz
  • Max Input SPL: 140dB at 1kHz = 1% THD
  • Capacitance: 70 ±4PF
  • Double-sided
  • 34mm diameter x 13.4mm

Additional information

Weight .25 lbs
Dimensions 3 × 2 × .75 in

C12 / CK12