M-2 - Dual Channel


Two Independent Voice Processing Channels

The M-2 is a dual-channel DSP-based voice processor which operates as two independent channels.


The M-2 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 48kHz base sample rate, the M-2 adds absolutely no undesired coloration to the signal and faithfully preserves the sound of any microphone and talent combination. It also features a four-section equalizer with high and low shelving EQ and two bands of fully parametric EQ, high and low pass filters, compressor, de-esser, expander and limiter functions.

Included in the M-2 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 M-2 offers the security of password protected TCP/IP-based remote control and no front panel controls.

M2 REAR Back

Wheatstone-designed Dynamics Control

A high performance de-esser and a smooth sounding, very low distortion compressor/limiter dynamics control section round out the M-2’s offerings to create powerful and authoritative presence on production or on-air microphones.

Wheatstone-designed Equalization

Very high quality parametric and shelving equalization is available to sweeten the sound of any microphone as desired without adding noise or undesirable artifacts to the signal.

Wheatstone 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.


  • Extremely high performance microphone preamplifiers with 48V phantom power

  • Two completely independent processing channels

  • 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

M-2 Software


M2 Expander

M2 Filters

M2 DeEsser

M-2 Control GUI

The Control Software loads on an external PC. You can connect the PC directly to the processor, or install the processor on your station’s Ethernet LAN and access it from anywhere in your network (or remotely over VPN).

With Control Software no adjustment is more than two mouse clicks away. And unlike other processors, every processing control is available and labeled for exactly what it does, giving you ultimate power to create your ideal sound.

The remote control screen is divided into an upper control area and a lower dynamic section that includes real-time display of gain reduction as well as a frequency-domain graph that shows the spectral characteristics of your audio. Every screen also includes accurate metering of input and output peak and average levels. Tabs across the top of the GUI software allow immediate access to each section of the processing - parametric EQ, de-esser, filters, compressor and downward expander.

All parameters of the M-2 are adjustable using the included Windows-based GUI which can control as many as 254 M-2 devices.

Talent Control Interface

M2 TalentControlInterface

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. 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 Wheatstone microphone processor without allowing processing adjustments. 

M2 BlockDiagram

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
24dB/octave Butterworth 
24dB/octave Butterworth 
Fixed bandwidth 

Threshold Adjustable: 
-60dBFS to 0dBFS
Depth Adjustable: 
Close Adjustable: 

Control: Recursive-style
Threshold Adjustable: 
-10dBFS to -60dBFS 
Release time Adjustable: 
De-ess frequency Adjustable:

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

Zero-overshoot look-ahead limiter
 -50 to -10dBFS

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

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