Apogee Symphony I/O

Professional audio interface for Mac-based Pro Tools HD & Thunderbolt™ workstations

What is Symphony I/O

Apogee Symphony I/O is a modular multi-channel audio interface featuring premium AD/DA conversion and world-class microphone preamps. Designed to deliver professional sound quality for audio recording, mixing and mastering on a Mac, Symphony I/O is the ultimate music production centerpiece for any modern studio. Connect Symphony I/O to any Mac based Thunderbolt, Pro Tools HD or USB audio workstation.

Legendary Sound Quality

Symphony I/O is the culmination of 25 years of Apogee’s award-winning design experience. Using the most advanced components available, Apogee engineers created an extremely efficient circuit and power design resulting in a significant improvement in audio clarity and transparency over any previous Apogee product.

Input and Output Flexibility

There is a Symphony I/O solution everyone; the home studio, project studio, commercial recording studio and scoring stage. Choose from five base configurations, 2×68×816×168×8 with 8 mic preamps, or 16×16 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 offers the best per-channel value of any interface in its category.

Complete Compatibility

Connect Symphony I/O to any Apple workstation; MacBook, iMac or Mac Pro via Thunderbolt, Pro Tools HD, Symphony PCI or USB. Symphony I/O is simple to set up and easy to use.

 Symphony I/O Highlights:

  • Best sounding Apogee interface ever
  • Best price-per-channel value of any professional audio interface
  • Complete compatibility with Audio Interface Modes (AIM):
    • Symphony/Thunderbolt™ (connect to Symphony 64 | ThunderBridge or Symphony 64 PCIe card for up to 64 channels of I/O at sample rates up to 192kHz)
    • Pro Tools HD (connect directly to any Pro Tools PCIe card)
    • USB (connect to high-speed USB 2.0 port for up to 16 channels of I/O at sample rates up to 96kHz)
    • StandAlone (Analog inputs routed directly to Digital outputs)
  • Expand with 4 available I/O Modules and 8 channel mic preamp module
  • Up to 32 channels of simultaneous analog and digital I/O per unit
  • Ultra-low latency performance
  • Future-proof modular architecture
  • Symphony I/O works with any Core Audio compatible application including: Logic, Pro Tools 9 and 10, Final Cut. Ableton Live
  • Designed in California, Built in the U.S.A.

ESS Sabre32 DAC Technology

ESS Sabre32 32-bit Hyperstream DAC with Time Domain Jitter Eliminator offers unequalled dynamic range, ultra low distortion, and unmatched audio clarity free from input jitter.


While ESS Sabre32 DAC has been widely recognized and employed in the audiophile community as the next step in converter technology, Apogee is one of the first pro audio manufacturers to employ this DAC in an interface designed for audio and video professionals. ESS Sabre32 DAC technology, as employed in Duet 2, Duet for iPad & Mac, Quartet and Symphony I/O, is one ingredient in the Apogee Engineering Difference. The benefits of the ESS Sabre32 DAC include:

32-bit DAC Architecture – Compared to older 24-bit technology, the Sabre32 DAC’s 32-bit filter processing  results in significantly lower noise and distortion, for a pure listening experience free from artifacts. 32-bit digital attenuation ensures that sonic purity is maintained at any listening level.

Time Domain Jitter Elimination removes clock inconsistencies from the incoming digital data, so the converted analog output preserves the clarity and soundstage detail of the original recording.

Apogee Symphony 64 ThunderBridge

64 Channel Thunderbolt connection for Symphony I/O

Symphony 64 | ThunderBridge connects Symphony I/O to any Thunderbolt™ equipped Mac for true Thunderbolt compatibility and performance.  ThunderBridge will also connect X-Symphony equipped AD-16X, DA-16X and Rosetta Series converters to Thunderbolt Macs.

Symphony I/O Artists


Bob Ludwig - Grammy Winning Mastering Engineer

Recent Projects: Queen, Eric Clapton, Bruce Springsteen, Coldplay, Wilco, Tony Bennett
"Symphony I/O is unquestionably the most transparent and best sounding converter ever...I use it every day."

Symphony I/O Recordings


Base Configurations

Customer Reviews



“I’ve had my Symphony for over a year. I felt I needed to share my review, as reviews are so helpful to me in my purchases, especially big ones. Simply put, the Symphony is amazing. It is one of the best studio investments I have no made. The sound is stunning! I have a small project studio. I have tracked guitars (electric, acoustic), vocals, bass, percussion, mandolin, and violin, all with amazing results. The 3-D depth and the space between instruments in a mix is amazing. The low end is tight and clear. Mids and highs are never harsh but brilliant and clear. The sound you’re recorded is reproduced exactly as it was recorded. Operation and setup was easy. Love the strudy dual function metal knobs on the front panel to change modes or adjust volume. Aesthetics are beautiful with Mac style aluminum panels on both sides and bright metering. Nice Apogee LED light when the unit is powered but no in operation.”

Brian from Alexandria, VT
From Sweetwater

WOW!! Unbelievable


“THIS unit is light years ahead of anything I have ever heard. The Symphony IO coupled with my Focal Twin Be6’s now give my studio that truly professional sound – NO BS!! I am hearing highs that I knew existed but could discern. And my low end immediately tightened up!! truly!!! I have been struggling with bass in my room – I have pretty great bass trapping and all but even with my ensemble – the bass always sounded…flappy, not tight and certainly nowhere close to what pro studios sound like? Well not any more – immediate gratification in the low end…in fact throughout the entire sound spectrum – I ran some XTZ Room analysis to compare and I can see from the graphs a huge difference. Look, I wish I could tell you all that this sucks so you would not buy it and thus reduce my competition, but that would be a lie and just wrong. In fact I wish more people would buy a unit like this so I could quit hear crappy mixes J It’s simple! If you want your mixes to sound like LA or NY or Nashville – you need to make the investment – period and investing in the Symphony IO is a step in the right direction.

I have said it time and time again, THANK YOU Ben Porter – I actually cried (just a tad) when I put up Kansas, Blackeyed Peas, Aerosmith, Muse up and OH MY GOD it’s was the most pleasing thing I had ever heard!”

Brad Lund – Westlund Recording Studios from Tuscan, AZ
From Sweetwater



“I recently upgraded to the Apogee Symphony IO and it sounds so natural/smooth with 3D depth. The metering is nice and the box is future proof with all the different module options. I did my homework for months and months and it led me to the Apogee Symphony IO! If you are planning on running a mac then this box is for you”

Vahe ‘The Claw” from Los Angeles, CA
From Sweetwater


Apogee Symphony I/O 8X8+8 Mic Preamp ThunderBridge Symphony 64 TapeOp Review

Tape Op Magazine - Symphony I/O Review

"...It was like we upgraded the speakers. It was more real. I felt closer to standing in the room when the band played...But only within the context of a real project was I able to appreciate the magnitude of improvement - in realism, depth, and dynamics - that comes with the Symphony system. These converters will upgrade your recording in a significant way."

Tape Op - Apogee Symphony I/O Review

"We've been really happy with Symphony I/O here at The Hangar, and I feel like it's not only a good audio investment, but that I'll likely still be using it in ten years, which is not something that you can say about a lot of digital hardware, as it tends to become obsolete quickly. But Apogee has always been a step or two ahead of the curve sonically, and Symphony I/O's versatile architecture leaves a lot of room for future options, expansion, and upgrades. If you're looking for a high- end, versatile converter system, you really need to consider it."

Sound on Sound - Apogee Symphony I/O Review

"With versatile I/O complements, comprehensive software control, and the ability to connect directly to computers via USB, 64PCIe interface, or Pro Tools HD interface, the Symphony is a very attractive system. The quality of the audio signal path lives up to Apogee's claims - this is a very nice and extremely transparent-sounding converter, without the subtle colourations that have been associated with earlier Apogee designs."
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