Apogee Symphony I/O Mk II Thunderbolt 3 Chassis

The Apogee Symphony I/O Mk II Thunderbolt 3 Chassis is the premium 2U foundation for high-performance Mac-based recording studios and mix rooms. Equipped with a pre-installed, high-bandwidth Thunderbolt 3 card, this base unit connects directly to Apple Silicon or Intel-based Macs delivering low latency integration with Logic Pro, Pro Tools, Cubase, or any Core Audio host software.

Designed as the ultimate studio centrepiece, its modular chassis allows you to build out the exact input/output configurations you need while securing a future-proof setup. It utilises premium ESS Sabre32 Hyperstream DAC architecture to deliver an astonishing $129\text{ dB}$ of dynamic range and near-zero distortion for pristine, true-to-source audio reproduction.

Its defining advantage is a future proof, modular design. The rugged 2U chassis features two high-density slots to configure, expand, or swap connectivity platforms and analog I/O as your studio requirements evolve.

On the front panel, an integrated high-resolution TFT touchscreen gives you direct physical command over your sessions, allowing you to manage 64 channels of high-speed metering, adjust microphone preamplifier gains, configure clock sources, and toggle monitor states without ever touching a mouse.

Key Features

• Native Thunderbolt 3 Data Path: Offers lightning-fast speeds, ultra-low tracking latency, and backwards compatibility with older Thunderbolt ports via certified adapters.
• Dual Open I/O Slots: Accommodates up to two standalone Symphony I/O Mk II expansion modules, supporting up to 32×32 channels of analog inputs and outputs per 2U unit.
• Flagship Conversion Standards: Premium components running up to 24-bit/192kHz capture multi-layered audio arrays with microscopic clarity and phase accuracy.
• Fully Modular Backplane: Dual-slot architecture supports up to 32 channels of simultaneous analog inputs and outputs per single 2U frame.
• Immersive Audio Ready: Fully equipped to handle speaker alignment and monitor control for complex surround, $\mathrm{7.1.4}$, or $\mathrm{9.1.6}$ Dolby Atmos layouts.
• Constant Current Drive™ Headphone Amp: Ultra-high-current, zero-impedance front headphone output delivers pristine monitoring accuracy regardless of headphone impedance.
• Ultra Quiet Thermals: Smart internal temperature management keeps the chassis cool and completely silent in critical tracking environments.
• Hand built in the USA: Proudly engineered and manufactured in the USA using premium, tour grade components.

Specifications

Analog to Digital:

• THD+N: -115 dB @ 22dBu (0.00020%) unweighted
• Dynamic Range: 122dB A weighted
• Maximum input levels:
  • +4dB setting: +24dBu
  • -10dB setting: +6dBV
• Frequency Response at 44.1 – 20,000 kHz (+/- 0.05dB)
• Input impedance: 10K

Digital to Analog:

• THD+N:-119dB @ 21 dBu (0.00014%) unweighted
• Dynamic Range: 126 dB A weighted
• Max output levels – ∞ to +24dBu
• Frequency Response at 44.1 kHz: dc to 20 kHz (+/- 0.05dB)
• Output impedance: 50 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: 121 db A weighted
• Output: Apogee’s proprietary Constant Current Drive™ provides smooth frequency response with any headphones.

Power

• 90-240VAC, 50-60Hz, 150W

Note: This is a chassis-only unit and requires AD/DA expansion cards to function. If you need help choosing the right modules for your setup, please get in touch.