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Mods for the 990S

  • Microphone PartsMicrophone Parts
    The new mod kit for the MXL 990S and 770 transforms this sub-$100 mic into a high-end studio workhorse: very low noise, high sensitivity, and your choice of color: RK7 (dark), RK-47 (balanced), or RK-12 (smooth presence). Designed by Jim Williams, the mod kit lets you build an expensive-sounding mic without the guesswork and tinkering that plagues most DIY mod efforts. The kit rebuilds the audio circuit with high-grade, hand-picked parts.

CardioidMXL 990S

Cardioid Condenser Microphone

The MXL 990S is essentially a 990 with the addition of a switchable pad (-10dB) and high-pass filter (-6dB/octave @ 150Hz). As part of the “900 Series,” the 990S is sold exclusively through Guitar Center and its affiliates.

MXL 770 and 990SAside from the finish colors and the height of the microphone, the MXL 770 is identical to the 990S. The two mics’ MSRPs, as of late 2012, are the same ($150).

The capsule assembly in the 990S can be found in the 770, 990, and MCA SP-1. It is MXL’s 603S/604 small-diaphragm model mounted within a brass baffle ring. The brass ring alters the capsule’s frequency and polar response.

The suspended area of the diaphragm has a 17mm diameter, with a 20mm backplate. The housing that contains these pieces has a 22mm diameter. See the 603S capsule listing for more mics with the same capsule.

MXL 770 and 990S PCBsThe 770/990S circuit is a variation on the Schoeps transformerless design. A simpler version, with no pad and filter, is found in the MXL 990, MCA SP-1, MXL 2006, and MXL V63M.

The MXL 990S ships in a padded rigid plastic case with an elastic shockmount.

The MXL 990S is also known as: 990-S.

Specifications

Frequency Response - CardioidClick Graph to Compare!
990S Cardioid Frequency Response Chart
Pickup Patterns Pads & Filters
Cardioid (15 mV/Pa; 30 - 20,000 Hz)
  • Pad: -10dB (Via Switch)
  • Filter: HPF: -6dB/octave @ 150Hz (Via Switch)
Capsule Dimensions Impedance SPL/Noise
Diaphragm diameter: 17.1mm
Capsule diameter: 19.9mm
Diaphragm gauge: 6 microns
200 Ohms (Low) Max SPL: 130 dB
Self-noise: 20.0 dB(A)
Weight Length Max Diameter Interface(s)
360g (12.70oz) 130mm (5.12'') 60mm (2.36'')
  • 3-pin XLR male (1)
Power Specifications
  • Requires phantom power
  • Phantom voltage: 48 ± 4v

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