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CardioidStudio Projects B1

Cardioid Condenser Microphone

The Studio Projects B1 is an entry-level large-diaphragm FET condenser microphone, designed by PMI’s Brent Casey and manufactured in China by 797 Audio.

Like all Studio Projects FET mics, the B1 has transformerless output and a 3-micron large-diaphragm capsule. The mic’s impedance conversion circuit, according to Brent Casey of PMI, is linear.

The original version of the B1, which shipped from March 2002 through mid-2006, had no pad nor high-pass filters and sold for $119.95 (MSRP). The current version has a 3-way pad (0, -10, -20) and 3-way HPF (flat, -6dB/octave @ 75Hz, -6dB/octave @ 150Hz), and an MSRP of $149.

B1 PCBInspection of the circuit board reveals high-quality components and construction. Most capacitors are Wima film units. The input coupling capacitor is polystyrene. All wires are glued in place to prevent breakage/disconnection under manual strain.

SoundOnSound, 2005

[O]ne very pleasant surprise was the way this mic interpreted acoustic guitar. Most capacitor mics will render a fairly clean and natural-sounding recording of an acoustic guitar if correctly positioned, but this model added some flattering weight to the sound and seemed less critical of positioning. It also seemed to smooth out the rough edges without losing any detail


It’s pretty scary that mics this inexpensive can sound this good.

The Studio Projects B1 is also known as: B-1.

The mic was released in 2002.


Frequency Response - CardioidClick Graph to Compare!
B1 Cardioid Frequency Response Chart
Pickup Patterns Pads & Filters
Cardioid (20 mV/Pa; 20 - 20,000 Hz)
  • Pad: -10dB (Via Switch)
  • Pad: -20dB (Via Switch)
  • Filter: HPF: -6dB/octave @ 75Hz (Via Switch)
  • Filter: HPF: -6dB/octave @ 150Hz (Via Switch)
Capsule Dimensions Impedance SPL/Noise
Diaphragm diameter: 25mm
Capsule diameter: 34mm
Diaphragm gauge: 3 microns
200 Ohms (Low) Max SPL: 132 dB
Self-noise: 12.0 dB(A)
Weight Length Max Diameter Interface(s)
n/a n/a n/a
  • 3-pin XLR male (1)
Power Specifications
  • Requires phantom power
  • Phantom voltage: 48 ± 4v

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