Quattro3 USB and SIP/IP Telephone (MT305)


  • Overview
  • Features
  • Connects To
  • Specifications
  • Resources

The Quattro3 (Q3) is a high-quality conference speakerphone that will turn any room into a professionally sounding conference room. It has an exceptionally large pickup and broadcasting range, yet is small in size and discrete in design. The Quattro3 utilizes multiple microphones, a uniquely designed speaker, and a powerful DSP to achieve commanding performance. The Quattro3 MT305 SIP/IP model connects to any computer via USB and is compatible with most SIP/IP phone service providers. It comes equipped with a built-in keypad and LCD screen.  

*Note: If your PBX System does not support PoE, you will need to purchase the 48V Power Supply (MT320) to power the MT305.

The Quattro3 MT305 is an ideal USB and IP Phone solution for:

  • Small offices or home offices
  • Small to very large conference rooms
  • Classrooms and training rooms

The Q3 is compatible with PC (Windows and Linux) and Macintosh (MAC OS).



  • Four microphone beamforming array
  • Full duplex communication
  • Echo cancelling
  • Noise suppression
  • De‐reverb
  • Automatic gain control
  • Daisy chainable
  • Single source daisy chain powering
  • Bridging between USB and IP Telephone
  • Fully functional dial pad with backlit LCD screen
  • Interchangeable interface modules
  • Durable aluminum casing
  • LED lit control buttons


  • USB cable
  • Daisy chain cable (Ethernet)
  • Ethernet phone cable
  • Installed dial pad with backlit LCD screen
  • Interchangeable wire slot cover
  • User manual


The Quattro3 MT305 USB and SIP/IP Telephone connects via:

USB to your computer ‐ this connection is for any session using your computer, such as Voice Over IP applications (Vidyo, BlueJeans, FuzeBox, Skype, Microsoft Lync, etc.).

Ethernet cable to the internet – this connection is done via RJ45 connector and an Ethernet cable directly to your internet infrastructure and is supported by most SIP/IP Phone service providers.

*Note: If your PBX System does not support PoE, you will need to purchase the 48V Power Supply (MT320) to power the MT305.


USB interface (mini B connector)

3.5mm external loudspeaker and microphone jack

Volume up / Volume down buttons

Daisy chain expandability of up to 15 units

Power consumption: 5V 500mA peak through USB and wall mount AC/DC converted.


Frequency response 50Hz – 16 KHz

Low latency (10ms)

Broadcast level (peak): 92dB SPL @1m (5 watts RMS)

Three-way bridging capability

Noise cancellation > 10dB (without pumping noise)

100% full duplex – no attenuation (in either direction) during full duplex

High-end performance confirms to ITU-T G.167

Acoustic echo cancellation > 40dB with conversion speed of 40dB/sec

Residual echo is suppressed to the environment noise level, preventing artificial ducking of signal

4 high-quality directional microphones

Direction-finding algorithm (determines the presence and direction of a speaker)

Beamforming algorithm (forms and directs audio beams towards a defined direction

Automatic voice-level adjustment (AGC)


Dimension: 7” diameter, 1-7/8” height

Weight: 2 lbs

Metal case and metal grill mesh for high RFI immunity and product durability


Plug-and-play - No installation or drivers

Audio setup utility is available for Windows

The setup utility helps monitor the audio input and output level but is not required

Recording utility is available for Windows

Recording utility allows you to record conversations to your computer via the device

Operating systems: Windows 98 and up / Linux / MacOS


7 hours of battery talk time with secondary interface


USB cable

Daisy chain cable (Ethernet)

Telephone cable


Two years