Wheatstone Vorsis M-4 IP 4-Channel Microphone Processing Blade

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Support Documentation:
Technical Manual_Wheatstone_M4 IP.pdf

The M4IP-USB is a four-channel DSP-based BLADE-3 voice processor with four completely independent channels of high-quality, low-noise, high-dynamic range and accurate transient response voice processing in an IP networked rack unit.

The M4IP-USB combines four high-quality microphone preamps, four channels of Vorsis embedded microphone processing, and a WheatNet-IP BLADE interface, allowing you to place four microphone inputs anywhere in your WheatNet-IP Intelligent Network (although it also works just fine as a standalone processor). The preamps and processors are accessed and controlled from any point on the network via its Windows-based GUI.

Four independent USB ports are built in to facilitate the individual use of each processor output by separate computers.

The M4IP-USB is a great way to maximize your investment in on-air talent by combining four mic processors into a single rack space, accessible from anywhere.

The M4IP-USB microphone processor is equipped with four 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 M4IP-USB 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, and de-esser and expander functions.

The M4IP-USB also features four analog stereo line-level outputs, ideal for feeding headphone amplifiers associated with talent or studio monitoring systems, and four stereo AES digital outputs.

The signal path of the M4IP-USB includes four completely independent channels of Wheatstone’s smooth-sounding Vorsis dynamics processing. Adjustable from anywhere on your network the M4-IP offers the security of password protected TCP/IP-based remote control and no front panel controls.

Like all WheatNet-IP BLADE-3s, the M4IP-USB is AES67 compatible.


Based on great-sounding designs built for Wheatstone’s high performance professional audio applications, the M4IP-USB’s equalization section operates predictably and adds no noise, ringing, phasiness or other undesirable coloration to the sound.


A high performance and fully adjustable downward expander, de-esser, and smooth sounding broadband compressor and selectable low distortion final Lookahead limiter round out the M4IP-USB to create powerful and authoritative presence to production or on-air microphones.


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.


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.

All parameters of the M4IP-USB are controlled using the included Windows-based GUI. 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.

  • Extremely high performance microphone preamplifiers with 48V phantom power
  • Four completely independent processing channels
  • Four stereo analog line level outputs
  • Four independent USB ports
  • Four stereo AES outputs.
  • AES67 compatible
  • All digital, field proven Wheatstone-designed advanced processing algorithm
  • Phase Scrambler to correct asymmetrical voice waveforms
  • High- and low-pass filters
  • Fully adjustable downward expander
  • Precision de-esser sibilance controller
  • Four-bands of EQ: low-frequency shelving, two-band parametric, high-frequency shelving
  • Broadband compressor
  • Final precision peak limiter – can be defeated if desired for lower latency
  • TCP/IP-based remote control from anywhere via M4-IP 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
  • Front panel metering of input and output levels
  • Colorful OLED display
  • Requires only one rack space


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

Specifications for all voice processors (for easy comparison):


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.


  • M-1: unlimited preset storage on the host PC
  • M-2: storage for 80 presets in on-board non-volatile memory, unlimited storage on host PC.
  • M-4: storage for 80 presets in on-board non-volatile memory, unlimited storage on host PC.


  • Microphone XLR-F connector (one on M-1, two on M-2, four on M-4)
  • 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%


  • Mic or line level output selectable (M-1 only)
  • Line-level output (M-2 and M-4 only)
  • Digital XLR-M connector (one on M-1, two on M-2)
  • Two RJ45 to StudioHub standard (M-2 and M-4 only)
  • Reference Level:: 0VU=-20dBFS
  • Output Sample Rates:
    • M-1: 44.1 kHz, 48 kHz and 96 kHz
    • M-2: 48 kHz fixed
    • M-4: 44.1kHz or 48kHz
  • Balanced: 110Ω AES-3 0VU=-20dBfs
  • Analog XLR-M connector: (one on M-1, two on M-2)
  • 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 (M-2 only): 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
  • Attack time (M-2 only): Adjustable 0.1ms-100ms
  • Release time Adjustable: 50ms-500ms
  • De-ess frequency Adjustable: 20Hz-20kHz
  • Bandwidth (M-2 only): Adjustable 0.15-4 octave


  • 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

COMPRESSOR – M-1 and M-4

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


  • 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

FINAL LIMITER (M-2 and M-4 only)

  • Control: Zero-overshoot look-ahead limiter
  • Threshold: -50 to -10dBFS (fixed at -6dBFS in M-4)
  • Attack: 0-100ms (automatic in M-4)
  • Release: 10ms-330ms (automatic in M-4)

LOGIC I/O, M-1 and M-2

  • Remote control: RJ45 connector (two on M-2)
  • For M-1 and M-2: Optional Wheatstone Announcer Panel or custom interface
  • Connections: ON, OFF, Cough, ON tally, OFF tally, power and ground
  • GPI input (M-2 only): DB9 connector
  • Eight opto-isolated ports for external switching of presets (M-2 only)


  • 12 opto-isolated and fully configurable GPIO logic ports


  • M-1 and M-2: Ethernet 10-100BASE-T, RJ45 connector
  • M-4: 1000BaseT Gigabit Ethernet


  • Dimensions:
  • 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


  • Dimensions:
    • 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: 90-260VAC, 50-60Hz, 19VA


  • Dimensions: 19”/48.3cm wide
    • 1.75”/4.5cm high
    • 13.25”/33.7cm deep
    • (15.25”/38.7cm deep w/rear connectors)
  • Weight: 10.35lbs/4.69kg
  • Shipping weight: 14lbs/6.4kg
  • Power: 90-260, 50-60Hz, 22VA