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Apogee Digital Quartet USB Interface - Used  From Apogee

4 in X 8 out with industry-leading AD/DA conversion and 4 world-class mic pre's. The Quartet bridges the gap between the Apogee Duet and the Apogee Symphony I/O.


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Apogee Digital

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Manufacturer's Description from Apogee

The ultimate desktop studio interface and control center for Mac

Apogee Quartet is a professional USB audio interface designed to deliver the ultimate desktop recording experience to the Mac-based studio. Featuring 4 inputs and 8 outputs of Apogee’s industry-leading AD/DA conversion technology as well as 4 world-class mic preamps, Quartet bridges the gap between the 2-channel Apogee Duet and the 8-channel Apogee Ensemble.

All the I/O you need with room to grow

Connect up to 4 microphones, instruments, keyboards or line inputs. Plug in your MIDI controller or keyboard. Expand with up to 8 digital inputs. Monitor and mix it all in stereo, with up to 3 sets of speakers or in 5.1 surround. Quartet is the center of the modern studio and will help you take the performance and sound quality of your projects to the next level.

Simple, powerful and easy to work with

With its ergonomic, angular design and intuitive user interface, Quartet is inspiring, easy to use and in perfect harmony with your workspace. Dual full-color screens for critical input and output details, QuickTouch pads for easy I/O selection, and a single controller knob to conduct it all, make Quartet the perfect studio control center for your Mac.

Why Apogee Quartet is the best choice for your studio

Apogee is an award-winning industry leader in digital recording technology with over 25 years of experience. Preferred by recording pros around the world, Apogee products like Duet, Ensemble and Symphony I/O have been instrumental in creating countless GRAMMY® and OSCAR® winning recordings and have set the industry standard in professional recording for over two decades. Quartet is built solidly on this reputation.


 ♦ USB 2.0 High-speed Mac audio interface
 ♦ 4 Analog Inputs:

  • -- Combination line (balanced +20dBu max)
  • --Mic/Instrument (+20dBu/+14dBu max)
  • --4 Microphone preamps with up to 75dB of gain
  • --Selectable 48v phantom power, Soft Limit and phase invert

 ♦ Digital Inputs:

  • --ADAT/SMUX Input, 8 channels, 2 Toslink connectors, 44.1kHz to 96kHz
  • --MIDI input (USB-A type connector)

 ♦ 8 Analog Outputs:

  • --6 Balanced line outputs, +20 dBu maximum output level
  • --1 Independent 1/4” stereo headphone output

 ♦ Digital Outputs:

  • --MIDI output (USB-A type connector)
  • --Word clock output on BNC connector

 ♦ A/D and D/A conversion: 24 bit/192kHz
 ♦ 2 top panel high-resolution OLED displays
 ♦ Controller knob
 ♦ 6 touchpads for direct selection of inputs and outputs
 ♦ 3 assignable touchpads to control:

  • --Mute Outputs
  • --Dim Outputs
  • --Sum to Mono
  • --Clear Meters
  • --Engage Speaker Set (allows monitoring of up to 3 pairs of speakers)

In the box:

  • • Quartet
  • • 2 meter USB Cable
  • • Universal power supply for US, UK and EU
  • • QuickStart Guide
  • • Instructions for download of software and complete documentation
Apogee Digital

About Manufacturer

Apogee was founded in 1985 and initially made its name designing filters. Later, Apogee's complete conversion systems pushed the envelope of digital audio quality and solved many of the early problems with digital audio technology. Apogee converters have become regarded as the reference standard for digital audio conversion. Products such as the award-winning Rosetta 800, AD16x and DA16x  have become the modern benchmark by which digital audio conversion is judged. A new generation of Apogee products including the revolutionary Symphony I/O, with its modular design and flexible connectivity,  promise to extend the Apogee legacy and further advance the art of digital audio.


Mic Pre:

  • EIN: 128dB (un-weighted) @ 60dB, 150Ohm input
  • Max input level: +20dBu
  • Input impedance: 3KOhm


  • Max input level 14 dBu
  • Input impedance: >2MOhm

A/D conversion:

  • Max input level (+4dBu ref): +20dBu
  • Max input level (-10dBV ref):  +6dBV
  • Input impedance: 5KOhm
  • Freq resp 20 Hz -20Khz: > +/-0.2dB (@44.1Khz)
  • Rel. THD + N: -106dB (@ 96Khz)
  • Dyn. Range: 114dB (A-weighted)

D/A conversion:

  • Max output level (+4dBu ref): +20dBu
  • Max output level (-10dBV ref): +6dBV
  • Line output impedance: 90 Ohm
  • Max output level headphones: 19dBu
  • HPH output impedance 30 Ohm.
  • Freq resp 20Hz -20 Khz: > +/- 0.05dB (@44.1Khz)
  • Rel. THD+N : -113dB (@96Khz)
  • Dyn Range: 123dB (A-weighted)

System Requirements:

  • Computer: Intel Mac 1.5GHz or faster
  • Memory: 2 GB RAM minimum, 4 GB recommended
  • OS: 10.6.8, 10.7.4 or greater
  • Connection: Any available USB port on a Mac
  • Power: DC Power supply included

Compatible Software:

Quartet works with any Core Audio compatible application including:

  • Logic
  • Pro Tools 9 and 10
  • Final Cut
  • Ableton Live
  • GarageBand
  • Studio One
  • Cubase
  • Digital Performer
  • Nuendo