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OmnidirectionalCardioidBidirectionalStudio Projects C3

Multi-Pattern Condenser Microphone

The Studio Projects C3 is a multipattern large-diaphragm condenser microphone.

The capsule is a dual-diaphragm version of the capsule in the C1; it has twin 26.9mm diaphragms made of 6-micron Mylar. The capsule is modeled after the Neumann K67; it has two backplates and uses center-terminated diaphragms.

As with the C1 (and B series), the C3’s impedance conversion circuitry is linear from 50Hz–20kHz.

The mic was introduced at $599 in 2000, and subsequently redesigned around 2006. The following table describes the differences between the two models:

Original C3 (2000)Revised C3 (2006)
Branding:Studio Projects / 797 AudioRed SP badge
1. Pattern (O/8/C)
2. Pad or Filter
1. Pattern (O/8/C)
2. Pad (-10, Off, -20)
3. Filter (75Hz/Off/150Hz)
XLR housing:OffsetCentered
Input cap:Ceramic DiscPolystyrene

C3As the table shows, the revised C3 was improved over the original, with an upgraded input coupling cap, and higher polarization voltage to the capsule (which provides higher signal-to-noise ratio). In the samples we’ve seen, the revised C3 had had all its wire connections on the PCB covered in hot glue; this acts as a sealant and stabilizer to prevent problems of contamination and mechanical vibration.

The revised C3 also offered an expanded feature set. Whereas the original offered a single switch that could enable either a pad or filter, the revised microphone offered independent switches for pad and filter, with three options each (including “off”).

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The mic was released in 2000.


Frequency Response - OmnidirectionalClick Graph to Compare!
C3 Omnidirectional Frequency Response Chart
Frequency Response - CardioidClick Graph to Compare!
C3 Cardioid Frequency Response Chart
Frequency Response - BidirectionalClick Graph to Compare!
C3 Bidirectional Frequency Response Chart
Pickup Patterns Pads & Filters
Omnidirectional (12 mV/Pa; 30 - 20,000 Hz)
Cardioid (12 mV/Pa; 50 - 20,000 Hz)
Bidirectional (12 mV/Pa; 90 - 20,000 Hz)
  • Pad: -10dB (Detachable)
  • Filter: HPF: -6dB/octave @ 150Hz (Via Switch)
Capsule Dimensions Impedance SPL/Noise
Diaphragm diameter: 26.9mm
Capsule diameter: 34.1mm
Diaphragm gauge: 6 microns
200 Ohms (Low) Max SPL: 142 dB
Self-noise: 18.0 dB(A)
Weight Length Max Diameter Interface(s)
640g (22.58oz) 222mm (8.74'') 52mm (2.05'')
  • 3-pin XLR male (1)
Power Specifications
  • Requires phantom power
  • Phantom voltage: 48 ± 4v

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