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M-Audio Delta 66 Audio Interface

M-Audio Delta 66 Audio Interface

4.0 (1)

1 Critic Review

1 Review

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Page last updated Aug 14, 2025

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Unleash your creativity with the versatile M-Audio Delta 66 Audio Interface, a powerhouse in studio recording gear designed for musicians who demand precision and flexibility. This robust system combines a PCI card with a sturdy analog breakout box, enabling seamless integration with both analog and digital audio sources. Whether you're a seasoned producer or an ambitious home studio enthusiast, the Delta 66 is your key to achieving professional-grade audio recordings.

The heart of the Delta 66 lies in its capacity to deliver pristine audio quality, thanks to its 24-bit/96kHz full-duplex recording interface. The system includes a convenient breakout box featuring four analog inputs and outputs, which accommodate balanced or unbalanced connections, configurable for +4dB or -10dB signal levels. This ensures compatibility with a wide range of studio equipment, giving you the freedom to experiment and refine your sound.

Additionally, the Delta 66's PCI card offers S/PDIF I/O, facilitating digital transfers and ensuring your productions maintain their integrity when mastering or utilizing outboard effects. The included software enhances your creative workflow with comprehensive digital mixing, routing, and monitoring capabilities, providing everything you need to craft your next masterpiece.

Key Features:

6x6 24-bit/96kHz full-duplex recording interface
PCI Host card with external audio breakout box
S/PDIF inputs and outputs on RCA jacks
4x4 analog breakout box for balanced or unbalanced connections
Configurable for +4dB and -10dB signal levels
Comprehensive digital mixing, routing, and monitoring capabilities

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DOS Storm

Recording METAL on Windows 2000 with a 1999 Audio Interface!

DOS Storm

M-Audio Delta 66 PCI Sound Card from 1999

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Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about M-Audio Delta 66 Audio Interface.

Build quality

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The M-Audio Delta 66 is praised for its enduring build quality, still functioning well after years of use.
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Comparisons

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Users find the MOTU M4 offers desired features at a more accessible price compared to higher-end options like the RME Babyface Pro.
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Users note that the Omni I/O preamps provide more gain than the MOTU M4, although this is based on individual experiences rather than standardized measurements.
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Software and compatibility

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The Presonus io24c provides better integration with Studio One, offering onboard control features useful for mixing.
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Owners report driver issues with M-Audio Delta 66 on Windows 7, leading some to revert to older operating systems for stable performance.
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The control panel for Delta interfaces sometimes opens off-screen, requiring a registry edit to reset window positioning.
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Value and pricing

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The Focusrite Scarlett 8i6 3rd Gen offers additional inputs and outputs for only slightly more than the MOTU M4, challenging perceptions of quality compromises.
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Use cases and applications

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Having four inputs is essential for users who frequently record live bands, making it a valuable feature even if not used daily.
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Despite its age, the Delta 66 with Omni IO is noted for running almost continuously for years in home studio setups.
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Features and functionality

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Some Scarlett 3rd Gen interfaces now include loopback functionality, useful for audio streaming and recording without additional software.
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The Omni I/O provides 4 line outputs and 4 line inputs, making it versatile for various studio setups if adapted correctly.
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User experience

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After 6-7 years of use, some Delta 66 units experience XLR input failures, highlighting long-term wear concerns.
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Users express appreciation for the ability to crank headphone output levels significantly higher on the Omni I/O compared to some other interfaces.
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Setup and maintenance

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Users mention needing to reset the M-Audio Delta card via CPL when sound issues occur due to multiple applications using audio simultaneously.
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Other

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A user reports a noticeable quality improvement moving from Delta 1010 to Focusrite Saffire interfaces, particularly in sound clarity and preamp quality.
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Mods and upgrades

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Omni I/O can potentially be used with a USB interface by creating a custom cable for its 15-pin connector to individual TRS for line inputs/outputs.
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Critic Reviews

M Audio Delta 66

soundonsound.com

The M-Audio Delta 66 Audio Interface stands out for its high audio quality and excellent value for money, making it a versatile option for musicians who don't need extensive multitrack capabilities. Its 4-in/4-out configuration is ideal for small ensembles or MIDI + Audio setups. The Delta 66 benefits from flexible routing options provided by the Omni I/O, which adds mic preamps and mixer-like features. While the interface and Omni I/O are packed with features, the controls can initially be confusing, and the manual isn't much help. Despite the cramped layout and short cable, it's a budget-friendly choice that doesn't skimp on sound quality.

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steevc

341

over 11 years ago

Old, but dependable

Bought this second hand. It works perfectly with Linux. Need to install the mixer app (Envy24control) to set levels. I also have the Omni I/O box that provides mic pre-amps and other mixer functions. I have not used the digital i/o at all yet.

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