Apogee Electronics Symphony Mk II 8×8 PTHD Plus – 8 Mic/Line In x 8 Line Out Pro Tools HD Plus Audio Interface with 2 x DB25 + AES, SPDIF/ADAT/SMUX Optical & SPDIF Coax

OVERVIEW

The Apogee Electronics Symphony Mk II 8×8 PTHD Plus is a professional multi-channel audio interface built around Apogee’s flagship AD/DA conversion and designed for high-end recording, mixing and mastering workflows. Featuring eight Mic/Line inputs and eight line outputs via the Connect 8 I/O module, the system combines exceptional sonic transparency with dedicated Pro Tools HD Plus connectivity for seamless integration into professional studio environments.

Its modular Symphony Mk II architecture provides extensive flexibility, while the 8 mic/line in x 8 line out configuration includes 2 x DB25 connectors, AES connectivity, optical SPDIF/ADAT/SMUX and coaxial SPDIF. Ultra-low-latency performance and the intuitive front-panel touchscreen further streamline operation, making it easy to manage routing, monitoring and essential interface functions.

Designed and built in the USA, the Symphony Mk II 8×8 PTHD Plus also supports advanced monitoring workflows for immersive formats, with the broader Symphony Mk II platform capable of controlling up to 32 speaker outputs. Whether used for music production, post-production, mixing, mastering or immersive audio, it provides the conversion quality, connectivity and expandability expected from a flagship professional audio interface.

KEY HIGHLIGHTS

Flexible 8×8 I/O Configuration

The Connect 8 I/O module provides 8 Mic/Line inputs and 8 line outputs, complemented by 2 x DB25 connectors, AES, optical SPDIF/ADAT/SMUX and coaxial SPDIF connectivity for integrating a wide range of professional analog and digital equipment.

Flagship Apogee AD/DA Conversion

Experience exceptional clarity, detail and dynamic range with Apogee’s flagship analog-to-digital and digital-to-analog conversion. Designed for demanding professional applications, it delivers the transparency and accuracy required for critical recording, mixing and mastering.

Dedicated Pro Tools HD Plus Connectivity

The included Pro Tools HD Plus card provides dedicated connectivity for compatible Pro Tools HD and HDX systems, making this configuration a powerful solution for professional recording and production environments built around the Pro Tools ecosystem.

Ultra-Low-Latency Performance

Designed for demanding studio workflows, Symphony Mk II delivers ultra-low-latency performance for responsive recording and monitoring, helping keep your creative process efficient and uninterrupted.

Ready for Advanced Monitoring Workflows

Symphony Mk II supports flexible monitor workflows for stereo, surround and immersive audio applications, making it suitable for Dolby Atmos, Sony 360 Reality Audio and other multichannel production environments across the wider Symphony Mk II ecosystem.

Intuitive Touchscreen Control

An integrated touchscreen display provides direct, convenient access to essential interface settings and control, helping simplify operation in fast-paced professional studio environments.

Designed and Built in the USA

Designed and built in the USA, the Symphony Mk II is engineered for professional audio environments where exceptional sound quality, flexibility and long-term reliability are essential.

FEATURES

• Flagship Apogee AD/DA conversion
• 8 Mic/Line inputs and 8 line outputs
• Connect 8 I/O module
• Pro Tools HD Plus connectivity
• 2 x DB25 connectors
• AES digital I/O
• Optical SPDIF/ADAT/SMUX connectivity
• Coaxial SPDIF connectivity
• Ultra-low-latency performance
• Modular I/O architecture with support for up to 32 channels of analog I/O across the Symphony Mk II platform
• Intuitive front-panel touchscreen display
• Advanced monitor workflows for stereo, surround and immersive audio
• Supports monitoring systems with control of up to 32 speaker outputs
• Compatible with Dolby Atmos, Sony 360 Reality Audio and other immersive audio formats
• Professional headphone output with Apogee Constant Current Drive™
• Balanced outputs with Apogee Perfect Symmetry Circuitry (PSC)
• Compatible with Pro Tools HD and HDX systems
• Designed and built in the USA

TECHNICAL SPECS

Analogue I/O

Configuration: 8 Mic/Line In x 8 Line Out

I/O Module: Connect 8

Expansion: Modular I/O architecture, up to 32 channels

Analog Inputs: 8 mic/line

Analog Outputs: 8 line

Analog-to-Digital Conversion

THD+N: -115dB @ 22dBu (0.00020%), unweighted

Dynamic Range: 122dB A-weighted

Maximum Input Level (+4dB setting): +24dBu

Maximum Input Level (-10dB setting): +6dBV

Frequency Response: 20Hz–20kHz ±0.05dB @ 44.1kHz

Input Impedance: 10kΩ

Digital-to-Analog Conversion

THD+N: -119dB @ 21dBu (0.00014%), unweighted

Dynamic Range: 126dB A-weighted

Maximum Output Level: ∞ to +24dBu

Frequency Response: DC–20kHz ±0.05dB @ 44.1kHz

Output Impedance: 50Ω

Output Circuitry: Apogee proprietary Perfect Symmetry Circuitry (PSC)

Output Configuration: Balanced

Headphone Output

Outputs: 1 stereo 1/4″ headphone output on front panel

THD+N: -110dB @ 19dBu into 600Ω (80mW)

THD+N: -101dB @ 14dBu into 32Ω (470mW)

Dynamic Range: 121dB A-weighted

Technology: Apogee Constant Current Drive™

Digital Connectivity

DB25: 2 connectors

AES: 1 connection

Optical: SPDIF/ADAT/SMUX

Coaxial: SPDIF

Host Connection: Pro Tools HD Plus Card

Immersive Audio

Monitor Workflows: Symphony I/O Mk II Thunderbolt Monitor Workflows

Immersive Formats: Dolby Atmos, Sony 360 Reality Audio and other immersive audio systems

Speaker Outputs: Up to 32

Power

Power Requirements: 90–240VAC, 50–60Hz

Power Consumption: 150W

Operating System & Compatibility

Pro Tools HD/HDX: Mac or PC running Pro Tools HD 9 or later

Included Configuration

1 x Symphony Mk II Chassis

1 x Connect 8 I/O Module

1 x Pro Tools HD Plus Card

DOWNLOADS

• User Guide PDF (6.87 MB)