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Mods for the C 414 EB

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    Bill Bradley restores vintage mics in Nashville, TN.

OmnidirectionalCardioidHypercardioidBidirectionalAKG Acoustics C 414 EB

Multi-Pattern Condenser Microphone

The 414EB was the second-generation C414 microphone from AKG. Like its predecessor, it combined AKG’s famous CK-12 capsule with a solid-state amplifier circuit.

AKG C414EB SchematicThe EB revision introduced a 3-way high-pass filter, and upgraded the -10dB pad to include a -20dB option; both were selectable via switches on the rear of the mic body, below the microphone capsule.

  • The left-side switch controls the pad: 0dB, -10dB, -20dB.
  • The right switch controls the HPF: flat, -12dB/octave @ 75Hz, -12dB/octave @ 150Hz.

As with the original C414, the EB provided 4 polar patterns — Cardioid, Omni, Figure-of-8, and Hypercardioid — selectable via a switch below the capsule on the front of the microphone body.

AKG CK-12 Capsule Comparison, by Markus SauschlagerThe first production runs of the C414EB used AKG’s original CK-12 capsule, now known as the “brass” CK-12. To reduce manufacturing costs, AKG developed a variation that used fewer parts and an easier assembly method — notably, it used a “nylon” ring that snapped the diaphragm in place, rather than the brass tensioning ring that was screwed down.

AKG C414EB exploded view; photo by Bo Hansen, Hansen Audio, SwedenThe 414EB shipped with a stand adapter (AKG p/n SA 18/3), a foam windscreen (p/n W 26), and a plot of the mic’s frequency-response curve.

Photo credits:
CK-12 capsules: Markus Sauschlager, Austria
C414EB exploded view: Hansén Audio, Sweden

The AKG Acoustics C 414 EB is also known as: C414EB.

The mic was released in 1976.

Specifications

Frequency Response - OmnidirectionalClick Graph to Compare!
C 414 EB Omnidirectional Frequency Response Chart
Frequency Response - CardioidClick Graph to Compare!
C 414 EB Cardioid Frequency Response Chart
Frequency Response - HypercardioidClick Graph to Compare!
C 414 EB Hypercardioid Frequency Response Chart
Frequency Response - BidirectionalClick Graph to Compare!
C 414 EB Bidirectional Frequency Response Chart
Pickup Patterns Pads & Filters
Omnidirectional (6 mV/Pa; 30 - 20,000 Hz)
Cardioid (6 mV/Pa; 30 - 20,000 Hz)
Hypercardioid (6 mV/Pa; 30 - 20,000 Hz)
Bidirectional (6 mV/Pa; 30 - 20,000 Hz)
  • Pad: -10dB (Via Switch)
  • Pad: -20dB (Via Switch)
  • Filter: HPF: -12 dB/octave @ 75Hz (Via Switch)
  • Filter: HPF: -12 dB/octave @150Hz (Via Switch)
Capsule Dimensions Impedance SPL/Noise
Diameter n/a
 n/a Max SPL: 155 dB
Self-noise: 17.0 dB(A)
Weight Length Max Diameter Interface(s)
360g (12.70oz) 141mm (5.55'') n/a
  • 3-pin XLR male (1)
Power Specifications
  • Requires phantom power
  • Phantom voltage: 9–52v

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