Wheatstone M4-IP-USB Voice Processor

Wheatstone M4-IP-USB Voice Processor



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 




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




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




Specifications for all BLADEs...



Inputs             Electronic differential, >10KΩ (bridging) Optimum source impedance <1KΩ

Outputs          <10Ω, 20Hz-20kHz Optimum load impedance >600Ω


DB25 Female, requires DB25 Male cable end connectors

RJ45, requires straight-wired RJ45 plugs

Frequency response   ±0.25dB, 20Hz-20kHz, ref +4dBu

THD+n                      0.04%, 20Hz-20kHz, ref +4dBu

Noise                       -85dBu; -109dBr ref max level out

Gain range               ±18db, inputs and outputs

Maximum input         +24dBu

Maximum output       +24dBu

A>D converter          ADC enhanced dual bit, 24 bit resolution

D>A converter          DAC 24bit advanced ∑∆



Inputs            Balanced 110Ω AES-3, S/PDIF compatible

Outputs          Balanced 110Ω AES-3 only


DB25 Female, requires DB25 Male cable end connectors

RJ45, requires straight-wired RJ45 plugs

Frequency response         Flat, 20Hz-20kHz, ref -20dBFS, +4dBu

THD+n                           0.0009%, 20Hz-20kHz, ref -20dBFS, +4dBu

Noise                            -141dBFS, ref max level out

Gain range                    ±18db, inputs and outputs

Maximum input              0dBFS

Maximum output            0dBFS

Sample rate converters   32-96kHz, 16-24bit, on all inputs

AES channel status         Standard implementation




Electronic differential, >2KΩ (bridging)

Optimum source impedance <200Ω

Outputs           <10Ω, 20Hz-20kHz  Optimum load impedance >600Ω


XLR-F, requires XLR-M cable connector (microphone inputs)

DB25 female, requires DB25 Male cable end connectors (analog outputs)

RJ45, requires straight-wired RJ45 plugs (analog outputs, logic ports, & gigabit Ethernet

Frequency response     ±0.5dB, 20Hz-20kHz, ref +4dBu

THD+n          0.02%, 20Hz-20kHz, ref +4dBu

Noise          -85dBu; -109dBr ref max level out

Reference level           -50dBu

Gain range                  +20 to +80dB, inputs; ±18db, outputs

Maximum input           -10dBu

Maximum output          +24dBu

A>D converter            ADC enhanced dual bit, 24 bit resolution

D>A converter            DAC 24bit Advanced ∑∆




2 analog mic, patchable, with variable gain and +48V phantom

XLR mic in, RJ45 mic out

4 AES digital with SRC, RJ45

4 stereo analog, RJ45


4 stereo analog, PGM A-B-C-D, RJ45

1 stereo analog, control room, XLR

1 stereo analog, studio, XLR

1 stereo analog, headphone, phone jack and RJ45

1 stereo analog, cue, phone jack and RJ45

4 AES digital, PGM A-B-C-D, RJ45

Mix Engine                Internal mix engine for E-1 control surface

A>D converter          ADC enhanced dual bit, 24 bit resolution

D>A converter          DAC 24bit advanced ∑∆

Sample Rate Convertors          32-96KHz, 16-24 bit on all digital inputs



Inputs         8 AES Digital inputs on “D” connectors and RJ-45.

Outputs        8 AES Digital outputs on both “D” connectors and RJ-45.

Logic          12 Universal Logic ports

Processing: 8 Vorsis Embedded stereo 3-band processing chains, each with 4-band parametric equalizer, 3-way crossover, 3 compressors, three limiters, broadband lookahead limiter





Connector       RJ45 (2), 12 channels

Voltage          +5VDC to GND,  +5VDC and GND provided

Current          100mA max source/sink



Connectors   RJ45

Cable          CAT5E or CAT6

Audio transport          Gigabit Ethernet   1000BASE-T, used for all BLADE-to-BLADE audio traffic

Utility interface          100BASE-TX for future use



Sample rate          44.1 or 48kHz, user selectable in software

Sync                    Internal or external, External sync input on any I/O digital BLADE

Reference level     0dBFS=+4dBu (+4dBu=1.23VRMS)

Latency                0.5mS, BLADE to switch to BLADE




19"/48.3cm wide, 1-3/4"/4.5cm high 

13-1/4"/33.7cm deep 

15-1/4"/38.7cm deep with connectors

Shipping weight          14lbs/6.4kg



90-260VAC, 50-60Hz

ip88a: 49VA, 30W 

ip88d: 23VA, 12W 

ip88ad: 35VA, 19W

ip88m: 35VA, 19W 

ip88cb: 35VA, 19W

ip88e: 18VA, 10W

- See more at: http://wheatstone.com/radio-products1/blades-wheatnet-ip-audio-networking/processing/m4-ip-usb-voice-processing-blade-3#sthash.JCsdHY8f.dpuf