Wheatstone M-2 Voice Processor

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Wheatstone M-2 Voice Processor


The Wheatstone M2 is a dual-channel DSP-based voice processor. The M2 is able to operate in completely independent dual channel mode or, at the touch of a button, M/S mode for professional stereo recording applications.



The M2 microphone processor is equipped with twin, matched Super-Quiet (SQ) microphone preamplifiers featuring extremely low noise floor, very wide dynamic range, faithfully accurate transient response, and ruler flat frequency response. Operating in harmony with high quality 24-bit A/D converters and a 96kHz base sample rate the M2 adds absolutely no undesired coloration to the signal and faithfully preserves the sound of any microphone and talent combination. It features twin high-bandwidth, very low noise microphone preamplifiers, a four-section equalizer with high and low shelving EQ and two bands of fully parametric EQ, high and low pass filters, de-esser and expander functions.

The signal path of the M2 may be operated as a dual channel microphone processor with completely independent channels or as an M/S pair for use in professional high-quality, crossed-microphone M/S recordings. Included in the M2 dual-channel voice processor is Wheatstone's smooth-sounding Vorsis dynamics processing, configurable to up to three bands of processing. Adjustable from anywhere on your network the M2 offers the security of password protected TCP/IP-based remote control and no front panel controls.


Wheatstone-designed Equalization

Based on great-sounding designs built for Wheatstone?s high performance professional audio applications, the M2?s equalization section operates predictably and adds no noise, ringing, phasiness or other undesirable coloration to the sound.


Wheatstone-designed Dynamics Processing tools

A high performance and fully adjustable downward expander, de-esser, and smooth sounding broadband or multiband compressor and low distortion final limiter round out the M2 to create powerful and authoritative presence to production or on-air microphones.


Processing Presets

A variety of ready-to-use factory processing presets are provided, carefully tailored for different processing goals and formats. You can select a factory preset, confident that it will sound great just as it is. Or use a factory preset as a starting point and create a custom sound for each announcer, then save the new settings as a personalized user preset. In a facility with multiple microphone processors, presets saved in one unit can be easily copied to the others.


Wheatstone Talent Control Interface

The Wheatstone Talent Control Interface software can reside on an air studio/control room PC and gives talent the ability to recall presets from any Vorsis microphone processor without allowing processing adjustments. It offers also offers a high-resolution display of input and output levels as well as an FFT display of the talent?s voice either pre or post processing.

All parameters of the M2 are controlled using the included Windows-based GUI which can control as many as 254 M-2 devices. Voice talent can activate his or her own personal sound at the press of a button using the Talent Control Interface, a special GUI designed for preset recall only.

Dimensions: Height - 1.650", Width - 17.346", Length - 12.800"



  • Extremely high performance microphone preamplifiers with 48V phantom power
  • Two completely independent processing channels ? may be operated as an M/S pair
  • All digital, field proven Wheatstone-designed advanced processing algorithms
  • Phase Scrambler to correct asymmetrical voice waveforms
  • High- and low-pass filters as well as an adjustable High-Q notch filter
  • Fully adjustable Downward expander
  • Precision de-esser sibilance controller
  • Four-bands of EQ: low-frequency shelving, two-band parametric, high-frequency shelving
  • Compressor: broadband, two, or three bands
  • Final precision peak limiter ? can be defeated if desired
  • TCP/IP-based remote control from anywhere via Vorsis Remote Control Software
  • Talent Control Interface software for preset recall without processor control
  • Password controlled access and control-less front panel for keeping settings secure
  • Full metering of input and output levels and all signal processing
  • FFT and oscilloscope displays of pre and post processing audio
  • Requires only one rack space


Recommended Applications

  • AM Analog
  • FM Analog
  • FM HD
  • AM HD
  • Television
  • Webcasting
  • Podcasting
  • Mastering & Production
  • Live Sound



Factory presets are pre-installed and write protected.
New factory presets can be down­loaded from the 
Wheatstone-Processing.com web site and installed 
via the Windows-based GUI software.

Storage for 80 presets in on-board non-volatile memory, unlimited storage on host PC.

Microphone XLR-F connector: two
Electronic differential: >2KΩ (bridg­ing)
Optimum source impedance: 200Ω
Phantom Power: 48VDC, switchable on/off
Gain: -10dB to +70dB in 1dB steps
Frequency response: ±0.2dB 20Hz-20KHz
Equivalent input noise (EIN): -128dBu
THD+N: <0.03%, 20Hz-20kHz, -50dBu input
SMPTE DIM: 0.00007%

Line-level output
Digital XLR-M connector: two,
Two RJ45 to StudioHub: standard
Reference Level: 0VU=-20dBFS
Output Sample Rates: 48kHz fixed
Balanced: 110Ω AES-3 0VU=-20dBfs
Analog XLR-M connector: Two
Electronically balanced : <10Ω source impedance
Optimum load impedance: >600Ω
Maximum output level: +24dBu

Asymmetry filter Phase rotator, 4th order allpass, switchable in/out
High-pass: 24dB/octave Butterworth
Adjustable: 20Hz-1kHz
Low-pass: 24dB/octave Butterworth
Adjustable: 1-20kHz
Notch: Fixed bandwidth
Adjustable: 20Hz-20kHz

Threshold Adjustable: -60dBFS to 0dBFS
Depth Adjustable: 0-40dB
Close Adjustable: 50ms-3s

Control: Recursive-style
Threshold Adjustable: -10dBFS to -60dBFS
Release time Adjustable: 50ms-500ms
De-ess frequency Adjustable: 20Hz-20kHz

Routable: Pre or post compressor
Band 1: Shelving
Adjustable: 20-200Hz
Boost/cut: ±14dB
Bands 2 and 3: Parametric
Adjustable: 20Hz-20kHz
Boost/cut: ±14dB
Bandwidth: 0.2-3.0 octave
Band 4: Shelving
Adjustable: 2kH-20kHz
Boost/cut: ±14dB

One, two, or three processing bands
Crossover frequencies:
Band 1-2: adjustable 20Hz-1kHz 

Band 2-3: adjustable 1kHz-20kHz
Threshold: 10 to -50dBFS
Attack time: 0.2ms-1s
Release time: 33ms-1s
Ratio: 1:1-20:1

Control: Zero-overshoot look-ahead limiter
Threshold: -50 to -10dBFS
Attack: 0-100ms
Release: 10ms-330ms

Remote control
RJ45 connector: two
Optional Wheatstone Announcer Panel or custom interface Connections: ON, OFF, Cough, ON tally, OFF tally, power and ground
GPI input: DB9 connector
Eight opto-isolated ports: for external switching of presets


Ethernet 10-100BASE-T

19”/48.3cm wide
1.75”/4.5cm high
16”/40.6cm deep (allow 3.25”/8.25cm for rear connectors)
Weight: 11.35lbs/5.16kg
Shipping weight: 15lbs/6.8kg
Power Requirements: 90-260VAC, 50-60Hz, 19VA