• 192kHz Capable
• Class-A Preamplifiers
• Flexible Control & Connectivity
• Desktop & Mobile Laptop Recording

Audio Interface

Sterling H224 Audio Interface Logo
Sterling H224 Audio Interface
Sterling H224 Audio Interface Logo

Features:

  • Desktop ergonomic design inspired by classic studio consoles
  • Studio quality audio converters for capturing professional audio and reproduction
  • Mic preamps come professionally equipped with PAD and High Pass Filters
  • Dedicated metering on each input and output path for optimal signal monitoring
  • 100% USB bus powered eliminates the need for separate power supply anywhere
  • Direct Monitoring switch allows for monitoring signals pre-DAW
  • Two (2) Mic/Line preamps with Class-A discrete electronics, and 60dB of class leading gain
  • Four (4) dedicated professional outputs for maximum flexibility in monitoring, re-amping and workflow
  • Dedicated MIDI I/O for integration with your favorite controllers, synths and electronic instruments
  • Two (2) dedicated and electronically optimized instrument inputs that keep your guitars and instruments sounding the way they should
  • High-output headphone amplifier section for demanding tracking environments
  • Robust metal enclosure for durability
Sterling H224 Audio Interface Back View
  • Two (2) Mic/Line preamps with Class-A discrete electronics, and 60dB of class leading gain
  • Four (4) dedicated professional outputs for maximum flexibility in monitoring, re-amping and workflow
  • Dedicated MIDI I/O for integration with your favorite controllers, synths and electronic instruments
  • Two (2) dedicated and electronically optimized instrument inputs that keep your guitars and instruments sounding the way they should
  • High-output headphone amplifier section for demanding tracking environments
  • Robust metal enclosure for durability
Sterling H224 Audio Interface Side View

Optimized for Computer Recording

The Sterling Harmony H224 Audio Interface delivers studio-grade circuitry, superior sound quality, and flexible monitoring, all optimized for desktop recording.

With its NXS Class-A discrete electronics and premium-grade converters, it’s easy to achieve clear, transparent sound.

Plus, the micro console form-factor design with a sturdy metal enclosure allows it to fit seamlessly into any project studio or mobile recording environment, and echoes the flexibility and layout of large-format studio consoles.

Sterling H224 Audio Interface

Clearer Signal with Greater Flexibility

Our class-leading NXS mic preamps deliver less noise and a clearer signal for all your recordings, while its dedicated front panel Instrument inputs have their own optimized circuitry that makes the H224 one of the best interface options for recording guitar or bass.

The advanced flexibility of its four (4) output design allows for two separate stereo output mixes at once, so you can easily have a separate mix for talent, route tracks for re-amping, or run separate A/B studio monitors or other independent audio outputs

Sterling H224 Audio Interface

Clearer Signal with Greater Flexibility

Our class-leading NXS mic preamps deliver less noise and a clearer signal for all your recordings, while its dedicated front panel Instrument inputs have their own optimized circuitry that makes the H224 one of the best interface options for recording guitar or bass.

The advanced flexibility of its four (4) output design allows for two separate stereo output mixes at once, so you can easily have a separate mix for talent, route tracks for re-amping, or run separate A/B studio monitors or other independent audio outputs

Record Instruments, Vocals & MIDI on the Go

Plus, the H224 design is fully USB bus powered which means you can record anywhere inspiration strikes without a separate power supply, and the included MIDI I/O connections allow your hardware to perform as a MIDI interface too, so you can layer your projects with specialty instruments, MIDI controllers and synths alike.

Sterling H224 Audio Interface

Included Software

Slate Audio All Access Pass

Slate Digital All Access Pass

Get over 60 award-winning plugins & virtual instruments including:

  • Virtual Mix Rack - the channel strip of your dreams
  • Infinity EQ - our most advanced modern EQ yet
  • ANA 2 - the industry's most game-changing synth
  • Kilohearts Bundle - a suite of nearly 30 jaw-dropping modules
Slate Digital Virtual Analog Bundle
Plus a TON more. Try it FREE for 30 days!

Learn more about Slate Digital's All Access Pass at:

Bitwig Studio

Bitwig Studio 8-Track

is a great way to produce, record, and perform like a pro. As with every Bitwig product, 8-Track was designed around a lightning-fast workflow and a substantial library of devices and sounds. Connect your controller, record yourself, produce an arrangement, design new sounds, or just jam.

  • Full music-production environment for Windows, Mac OS, and Linux
  • 2,000 sounds and more than 60 instrument/FX devices included
  • Perform interactively with clips
  • Unique Modulation System
  • Plug-and-play MIDI controller support

What You Get

  • 8 audio-, instrument-, hybrid tracks
  • 2 effect tracks
  • 2 group tracks
  • 8 scenes
  • 2 VST plug-ins (with 32-/64-bit bridging, delay compensation, and crash protection)
  • VST multi-out and side-chain not supported
  • 16-bit audio export (including multi-track export)
  • 4/8 audio I/O busses
  • 3 algorithms of time stretching: Stretch, Stretch HD, Slice
  • 3 display profiles (single display only)

Find out more about Bitwig Studio 8-Track at:

Two Notes Torpedo Wall Of Sound
Your go-to guitar speaker and miking simulation plugin.
WoS 4 DynIR Virtual Cabinets
Find out more about Torpedo Wall of Sound from Two Notes Audio Engineering at:

Frequently Asked Questions:

If you do not find an answer to your question here, please contact our Customer Support at (888) 621-2154, or by filling in the form found on our contact page.

Bitwig provides a horizontal slider in audio settings for buffer size adjustment. To adjust buffer size using H224 buffer size select menu, click the AUTO button in the Bitwig audio settings dialog (it will turn orange), apply the changes via the text box pop-up, then click the “show control panel” button to adjust the buffer size via the H224 dialog.

Click H224 Control Panel "maximize" button (top right). Alternately the Config menu > “restore defaults” will reset the control panel default size and settings.

After hibernate or sleep, H224 volume may be lowered, simply readjust the volume as needed.

Verify in windows sound settings that the appropriate H224 outputs are selected. If you speakers are connected to H224 outputs 1, 2, then select “Speakers H224 Audio Driver” (which is H224 outputs 1,2).

Click the up arrow icon found in the taskbar near the system trey (taskbar clock) to reveal additional app icons. Drag the H224 silver “S” icon next to the taskbar clock so it is always visible.

This is by design, to avoid audio artifacts H224 gradually changes volume up or down regardless of how quickly volume knob is adjusted on the hardware.

In Pro Tools First, selecting “Optimize for Recording” sets the audio device buffer size to 64 samples. Selecting “Optimize for Mixing” sets the buffer size to 512 samples.

On windows, you can override this with a custom buffer size selection by going to menu Setup > Hardware. Clicking the button will bring up the H224 buffer select dialog.

On Windows, an H224 notification may appear in the lower right corner near the system trey clock. This can be disabled in Windows “Notifications & Actions” panel if it desired.

When H224 is the only audio device connected to the system, changing the sample rate via the H224 Control Panel App may result in playback error “can’t find audio device”. Simply attempt playback again after changing sample rate and in the future, avoid changing sample rate while playback is in progress.

Choose “restart anyway” to proceed with restart.

This is by design to avoid clipping of the audio signal being played from computer of DAW, and the direct monitor signals on hardware.

Some versions of Pro Tools require some device’s buffer size selection be made from the “setup” menu > “hardware” > “setup app” button.

Technical Information & Specifications:

(Click to expand)

General
  • Sample Rates: 44.1, 48, 88.2, 96, 176.4, 192 kHz
  • Converter Resolution: 24 bit
  • USB Communication Protocol: USB 2.0
Microphone Inputs
  • Maximum Input Level: +12.4 dBu (Balanced, Minimum Gain)
  • Gain Range: 0db to +60dB (Operational Range)
  • Frequency Response: 20Hz - 20kHz (+/- 0.1dB Minimum Gain)
  • Dynamic Range: 110.4 dB (A-Weighted, PAD On, Minimum Gain)
  • THD + N: 0.0044% (1kHz, -1 dBFS, Unity Gain)
  • EIN: -129dBu (Maximum Gain, 150Ω Load, PAD On)
  • Input Impedance: 3k Ohm
  • Phantom Power: +48V (+/- 0.5V), 10mA total
Line Inputs
  • Maximum Input Level: +28 dBu (Balanced, Minimum gain)
  • Gain Range: -25dB to +35dB (Operational Range)
  • Frequency Response: 20Hz-20kHz (+/-0.1dB) Minimum Gain
  • Dynamic Range: 106dB (A-Weighted, Minimum Gain, PAD Off)
  • THD + N: 0.0044%
  • Input Impedance: 9k Ohm
Instrument Inputs
  • Maximum Input Level: +16.5 dBu (Unbalanced, Minimum Gain)
  • Gain Range: -10db to +30dB (Operational Range)
  • Frequency Response: 20Hz-20kHz (+/-0.6dB) Minimum Gain
  • Dynamic Range: 106dB (A-Weighted, Minimum Gain)
  • THD + N: 0.0066%
  • Input Impedance: 1M Ohm
Main Outputs 1 & 2
  • Maximum Output Level: +18dBu (Balanced, No Direct Monitor Engaged)
  • Frequency Response: 20Hz-20kHz (+/-0.05dB) Maximum Output
  • Dynamic Range: 115dB (A-Weighted)
  • THD + N: 0.00047%
Outputs 3 & 4
  • Maximum Output Level: +18dBu (Balanced)
  • Frequency Response: 20Hz-20kHz (+/-0.05dB) Maximum Output
  • Dynamic Range: 115dB (A-Weighted)
  • THD + N: 0.000602%
Headphone Output
  • Output Impedance: less than 1Ω
  • Maximum Output Level: 45mW/channel into 56Ω (Maximum Output, no Direct Monitor engaged)
  • Frequency Response: 20Hz-20kHz +/-0.05dB (Maximum Output)
  • Dynamic Range: 113dB (A-Weighted)
  • THD + N: 0.00077%
  • Optimum Headphone Impedance Range: 30Ω to 300Ω (Recommended)

Technical Information & Specifications:

(Click to expand)

General
  • Sample Rates: 44.1, 48, 88.2, 96, 176.4, 192 kHz
  • Converter Resolution: 24 bit
  • USB Communication Protocol: USB 2.0
Microphone Inputs
  • Maximum Input Level: +12.4 dBu (Balanced, Minimum Gain)
  • Gain Range: 0db to +60dB (Operational Range)
  • Frequency Response: 20Hz - 20kHz (+/- 0.1dB Minimum Gain)
  • Dynamic Range: 110.4 dB (A-Weighted, PAD On, Minimum Gain)
  • THD + N: 0.0044% (1kHz, -1 dBFS, Unity Gain)
  • EIN: -129dBu (Maximum Gain, 150Ω Load, PAD On)
  • Input Impedance: 3k Ohm
  • Phantom Power: +48V (+/- 0.5V), 10mA total
Line Inputs
  • Maximum Input Level: +28 dBu (Balanced, Minimum gain)
  • Gain Range: -25dB to +35dB (Operational Range)
  • Frequency Response: 20Hz-20kHz (+/-0.1dB) Minimum Gain
  • Dynamic Range: 106dB (A-Weighted, Minimum Gain, PAD Off)
  • THD + N: 0.0044%
  • Input Impedance: 9k Ohm
Instrument Inputs
  • Maximum Input Level: +16.5 dBu (Unbalanced, Minimum Gain)
  • Gain Range: -10db to +30dB (Operational Range)
  • Frequency Response: 20Hz-20kHz (+/-0.6dB) Minimum Gain
  • Dynamic Range: 106dB (A-Weighted, Minimum Gain)
  • THD + N: 0.0066%
  • Input Impedance: 1M Ohm
Main Outputs 1 & 2
  • Maximum Output Level: +18dBu (Balanced, No Direct Monitor Engaged)
  • Frequency Response: 20Hz-20kHz (+/-0.05dB) Maximum Output
  • Dynamic Range: 115dB (A-Weighted)
  • THD + N: 0.00047%
Outputs 3 & 4
  • Maximum Output Level: +18dBu (Balanced)
  • Frequency Response: 20Hz-20kHz (+/-0.05dB) Maximum Output
  • Dynamic Range: 115dB (A-Weighted)
  • THD + N: 0.000602%
Headphone Output
  • Output Impedance: less than 1Ω
  • Maximum Output Level: 45mW/channel into 56Ω (Maximum Output, no Direct Monitor engaged)
  • Frequency Response: 20Hz-20kHz +/-0.05dB (Maximum Output)
  • Dynamic Range: 113dB (A-Weighted)
  • THD + N: 0.00077%
  • Optimum Headphone Impedance Range: 30Ω to 300Ω (Recommended)

Downloads & Software Requirements

The Harmony H224 Professional Audio Interface has been designed to work with Mac OS operating systems, as well as Microsoft Windows operating systems.

The Harmony H224 hardware requires software downloads to work with all features designed for the product. Click below to access the most current driver and software updates for installation.

Downloads & Software Requirements

Compatible with MacOS and Windows

The Harmony H224 is compatible with
both Mac OS and Windows

The Harmony H224 Professional Audio Interface has been designed to work with macOS operating systems, as well as Microsoft Windows operating systems.

The Harmony H224 hardware requires software downloads to work with all features designed for the product. Click below to access the most current driver and software updates for installation.

Available from the following retailers: