Wheatstone M-1 Voice Processor

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Wheatstone M-1 Voice Processor


The M1 is a flexible digital microphone processor. It offers unlimited presets, security and networkability in an all-digital framework, with easy-to-set up parameters. Either from the front panel, or from the GUI - all parameters of the M1 can be controlled to give each voice talent his or her own personal sound at the press of a button.




The M1 microphone processor is equipped with a Super-Quiet (SQ) microphone preamplifier featuring an 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 M1 adds absolutely no undesired coloration to the signal and faithfully preserves the sound of any microphone and talent combination.

The features on the M1 include a four-band parametric EQ, high- and low-pass filters, de-esser and expander and of course, our proprietary Vorsis dynamics processing. The unit comes loaded with factory designed presets, and designing your own is easy, thanks to features such as "Quick Save" and 'Quick Compare" that allow you to toggle back and forth between different presets as you adjust them.From one GUI an entire group of M1's can be controlled, making multiple microphone processor management easy.


Wheatstone-designed EQ

A 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-designed Dynamics Control

A high performance de-esser and a smooth sounding, very low distortion compressor/limiter dynamics control section round out the M1?s offerings to create powerful and authoritative presence to production or on-air microphones.

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



  • Control of all audio parameters
  • Intuitive PC graphical user interface (GUI)
  • High quality, low noise microphone preamp
  • Phantom power
  • Metering: In/Out, De-esser, Compression, Expansion
  • Password based security
  • 44.1, 48 or 96 kHz AES3 output sample rates
  • 24-bit A/D, D/A converters
  • Preset storage/recall via GUI
  • Variable frequency De-esser
  • Voice phase scrambler
  • Adjustable compression
  • Downward expansion
  • Output limiter
  • EQ: two-band parametric plus variable high and low shelving
  • Tunable high and low pass filters
  • FFT voice energy display via GUI
  • Quick save/compare function
  • TCP/IP Ethernet remote control
  • Takes up 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.
Unlimited preset storage on the host PC

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: one
Reference Level: 0VU=-20dBFS
Output Sample Rates: 44.1 kHz, 48 kHz and 96 kHz 
Balanced: 110Ω AES-3 0VU=-20dBfs
Analog XLR-M connector: one
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

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

Control: Broadband
Threshold: -10dBFS to -50dBFS
Attack time: 0.2ms-1s
Release time: 33ms-1s
Ratio: 1:1-20:1

Optional Wheatstone Announcer Panel or custom interface Connections:
ON, OFF, Cough, ON tally, OFF tally, power and ground


Ethernet 10-100BASE-T, 

19”/48.3cm wide
1.75”/4.5cm high
10”/25.4cm deep (allow 3.25”/8.25cm for rear connectors)
Weight: 8.1lbs/3.68kg
Shipping weight: 13lbs/5.9kg
Power Requirements: 90-260VAC, 50-60Hz, 24VA