Apogee Symphony I/O Mk II Chassis

Contact Us To Configure

Special Order Non-Stock, Normally Ships In 3 to 5 Business Days

Stock Item: Ships from our shelf quickly in almost all cases when ordered before our ship cutoff times.

Direct Ship: Non-stock item, but normally ships quickly from the manufacturer or alternate warehouse.

Built To Order: Item is custom built per the options chosen and quickly shipped out upon completion.

More On The Way: The manufacturer is experiencing delays, but we'll ship quickly upon arrival.

New Item: We have this on order, the manufacturer hasn't shipped but you'll be in line upon arrival.

Visit our Shipping Page for cutoff times for FREE (USA), UPS, USPS or FedEx.

Visit our Returns Page for info on non-returnable, special order non-stock items.


  • Empty Chassis (you provide compatible modules)
  • Interface Type - Thunderbolt, Pro Tools HD or Waves SoundGrid

Symphony I/O Mk II General Description

Symphony I/O Mk II is a multi-channel audio interface featuring Apogee’s newest flagship AD/DA conversion, modular I/O (up to 32 inputs and outputs), intuitive touchscreen display and optional world-class microphone preamps. Designed to deliver professional sound quality for audio recording, mixing and mastering, Symphony I/O Mk II is the ultimate music production centerpiece for any modern studio.

The new Symphony I/O Mk II comes with direct connectivity to one of three different platforms – Thunderbolt™, Pro Tools® HD or Waves SoundGrid® network.

Apogee Symphony I/O Mk II Highlights

  • Best AD/DA conversion of any Thunderbolt™ audio interface
  • Up to 32 channels of modular analog I/O with optional 8 mic preamps
  • Best per-channel value of any interface in its category
  • Choice of Thunderbolt, Pro Tools® HD (Mac/PC) or Waves SoundGrid® connectivity
  • Ultra-low latency performance
  • Intuitive touchscreen display and front panel control
  • Designed in California, Built in the U.S.A.

Input and Output Flexibility

There is a Symphony I/O Mk II solution for everyone; the home studio, project studio, commercial recording studio and scoring stage. Choose from four base I/O configurations, 2×6, 8×8, 16×16, or 8×8 with 8 mic preamps and easily expand as your studio grows. With two module slots and the capacity for up to 32 inputs and outputs of A/D & D/A conversion per unit, Symphony I/O Mk II offers the best per-channel value of any interface in its category.

Legendary Sound Quality

Apogee engineers have made it their passion to improve every new flagship product by using the latest in electrical components and designing optimized circuitry that often exceeds the expectations of the component manufacturer. This is the Apogee Advantage. Symphony I/O Mk II is the culmination of this 30 year commitment and raises the bar on all Apogee products before it with even better audio clarity and sonic transparency. In fact, when equipped with either the new 8×8 or 16×16 Mk II I/O modules, Symphony I/O Mk II outperforms all other multi-channel audio interfaces available for Pro Tools HD or Thunderbolt based systems, making it the flagship audio interface for the entire professional audio industry and the obvious choice for countless GRAMMY winning artists, producers, songwriters and engineers.


  • Analog to Digital:
    THD+N: -114dB @ 22dBu (0.00020%)
    Dynamic range: 122dB A weighted
    Maximum input levels:
    +4dB setting: +24dBu
    -10dB setting: +6dBV
    Frequency response at 44.1kHz: 1-20,000 Hz (+/- 0.05dB)
    Input impedance: 10K
  • Digital to Analog:
    THD+N: -117dB @ 21dBu (0.00014%)
    Dynamic Range: 129dB A weighted
    Max output levels – ∞ to +24dBu
    Frequency response at 44.1 kHz: dc to 20kHz (+/- 0.05dB)
    Output impedance: 25 Ohm
    Outputs are balanced through Apogee’s proprietary Perfect Symmetry Circuitry (PSC)
  • Headphone Output:
    1 stereo 1/4″ headphone output on front panel
  • THD+N:
    -110dB @19dBu into 600 Ohm (=80mW)
    -101dB @14dBu into 32 Ohm (=470mW)
    Dynamic Range: 121db A weighted
    Output: Apogee’s proprietary Constant Current Drive™ provides smooth frequency response with any headphones
  • Package Contents:
    Symphony I/O Mk II Interface
    Power Cable
    Quick Start Guide
    Warranty Booklet
  • Symphony I/O Mk II Dimensions:
    Inches: 17.75 (19 with Rack Ears) x 11.5 x 3.5
    Centimeters: 45 (48.26 with Rack Ears) x 29.2 x 8.9
  • Packaging Dimensions:
    Symphony I/O Chassis Box
    Inches: 22.875 x 17.75 x 9.25
    Centimeters: 58.1 x 45.1 x 23.5
  • I/O Module Box
    Inches: 13.75 x 12.25 x 3.25
    Centimeters: 34.9 x 31.1 x 8.3
  • Power:
    90-240VAC, 50-60Hz, 150W
  • Operating System:
    Thunderbolt: Mac OS only 10.9.5 and above
    HD: Any Mac or PC running Pro Tools HD 9 or greater

Please check Apogee's website for current info before purchase: Apogee Symphony I/O Mk II Info

Our ONE WITH EVERYTHING ZEN WARRANTY extends the standard manufacturer warranty by one year, see our ZEN WARRANTY page for details.