Focusrite Scarlett 18i20 4th Gen USB Audio Interface vs MOTU M6 6x4 USB-C Audio Interface with Studio-Quality Sound
Updated August 2026 — Focusrite Scarlett 18i20 4th Gen USB Audio Interface wins on software bundle and connectivity, MOTU M6 6x4 USB-C Audio Interface with Studio-Quality Sound wins on latency.
The Focusrite Scarlett 18i20 offers superior input/output capabilities and audio quality, making it ideal for professional use, while the MOTU M6 provides excellent sound at a more affordable price.
Why Focusrite Scarlett 18i20 4th Gen USB Audio Interface is better
Audio Quality
Scarlett has a dynamic range of 122 dB compared to M6's 120 dB.
Inputs/Outputs
Scarlett offers 18 inputs and 20 outputs, far exceeding M6's 6 inputs and 4 outputs.
Software Bundle
Scarlett includes a comprehensive software package for recording.
Why MOTU M6 6x4 USB-C Audio Interface with Studio-Quality Sound is better
Price
M6 is significantly cheaper at $449.95 compared to Scarlett's $749.99.
Latency
M6 features ultra-low 2.5 ms round-trip latency.
Monitor Features
M6 has a unique A/B monitor switch for easy comparison.
Overall score
Specifications
| Spec | Focusrite Scarlett 18i20 4th Gen USB Audio Interface | MOTU M6 6x4 USB-C Audio Interface with Studio-Quality Sound |
|---|---|---|
| Preamps | 8 | 2 |
| USB Type | USB | USB-C |
| Weight | 3.5 lbs | 2.5 lbs |
| Monitor Switch | No | Yes |
| Included Software | Yes | No |
Dimension comparison
Overview of the Focusrite Scarlett 18i20
The Focusrite Scarlett 18i20 is a high-fidelity USB audio interface designed for extensive multitrack recording and music production. Priced at $749.99, it is positioned as a premium option in the audio interface market. With 18 inputs and 20 outputs, including eight mic preamps, this device is tailored for professional studios and ambitious home setups alike.
The Scarlett 18i20 is equipped with cutting-edge 24-bit, 192kHz converters from Focusrite’s flagship RedNet range, providing a dynamic range of 122 dB. This level of quality ensures that recordings capture every subtle detail. Additionally, features such as Auto Gain and Clip Safe make it easier for users to manage audio levels during recording, enhancing workflow efficiency.
Overview of the MOTU M6
The MOTU M6, priced at $449.95, presents itself as a competitive option in the audio interface landscape, especially for those seeking studio-quality sound without the hefty price tag. This 6x4 USB-C audio interface boasts best-in-class audio quality and speed, which is particularly appealing for musicians and podcasters.
The M6 is built with ESS Sabre32 Ultra DAC Technology, delivering an impressive 120 dB dynamic range on line outputs. Its ultra-low round-trip latency of 2.5 ms at 96 kHz allows for real-time monitoring of audio inputs, making it an excellent choice for live performances or recording sessions. The addition of features like loopback for streaming and a unique A/B monitor switch elevates its functionality for content creators.
Price Comparison
The Focusrite Scarlett 18i20 is priced at $749.99, while the MOTU M6 is priced at $449.95, making the M6 about 40% cheaper than the Scarlett 18i20. This significant price difference may influence buyers who are looking for professional sound quality without a substantial investment.
While the Scarlett offers more inputs and outputs, the MOTU provides a fantastic value proposition for those who may not require such extensive connectivity. The pricing strategy of both products clearly reflects their target markets, with the Focusrite aimed at larger projects and the MOTU appealing to smaller setups or budget-conscious users.
Input and Output Capabilities
The Focusrite Scarlett 18i20 excels in input and output capabilities, featuring 18 inputs and 20 outputs, including eight mic preamps. This extensive configuration is ideal for complex recording sessions, allowing multiple instruments and vocalists to be recorded simultaneously.
In contrast, the MOTU M6 offers a more modest setup with 6 inputs and 4 outputs. However, it compensates for this with superior sound quality and advanced monitoring features. The ability to monitor audio with a dynamic range of 120 dB makes the M6 a solid choice for users who prioritize audio fidelity over the number of channels.
Audio Quality and Performance
When it comes to audio quality, the Focusrite Scarlett 18i20 provides a dynamic range of 122 dB, which is slightly higher than the MOTU M6’s 120 dB. This difference may be negligible for many users, but it could make a difference in professional environments where every decibel counts.
Moreover, the Scarlett’s 4th Generation preamps and features like Air mode enhance the sound character, making it a strong contender for vocal and instrument recording. On the other hand, the M6’s ESS Sabre32 DAC technology ensures that it delivers high-quality sound even at its lower price point, making it a worthy opponent.
Monitoring and Usability Features
The Focusrite Scarlett 18i20 includes professional workflow tools such as Auto Gain and Clip Safe, which simplify the recording process by automatically adjusting levels and preventing clipping. This can be particularly beneficial for users who may not have extensive technical knowledge.
The MOTU M6 features a full-color LCD with detailed level meters, which provides clear visual feedback during recording and mixing. Additionally, the unique A/B monitor switch allows for easy comparison between different monitor setups, a feature not found in the Scarlett. These usability features can significantly impact the user experience, especially during live sessions or complex productions.
Software and Compatibility
Both interfaces come with a suite of software to enhance the user experience. The Focusrite Scarlett 18i20 includes Pro Tools Intro+, Ableton Live Lite, and Cubase LE, along with Hitmaker Expansion, which offers essential effects and mastering tools. This makes it an excellent choice for those who need a comprehensive recording package right out of the box.
The MOTU M6, while not explicitly listing bundled software, is compatible with a range of digital audio workstations, making it versatile for users who prefer different recording platforms. The ease of integration with various DAWs can be a deciding factor for many users when choosing between these two interfaces.
Which should you buy?
Choosing between the Focusrite Scarlett 18i20 and the MOTU M6 ultimately depends on your specific needs and budget. If you require extensive input and output capabilities along with advanced audio features, the Scarlett 18i20 is the clear winner, albeit at a higher price point. However, if you are looking for excellent audio quality, advanced monitoring features, and a more budget-friendly option, the MOTU M6 stands out as an exceptional choice. Both products serve their target audiences well, so consider your requirements carefully before making a decision.

