Mackie Professional Audio
Onyx 32-4, 4-Bus Sound Mixers

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Mackie Onyx 32-4


Model: Onyx 32-4
Premium 32-Channel/4-Bus Mid-Format Live Sound Console

How do you improve upon a hugely successful mixer? With a heavy dose of R&D, that's how. Building on the success of the legendary SR32•4, Mackie is proud to introduce the new Onyx 32.4 32-channel / 4-bus live sound console. Retaining the same convenient footprint as its predecessor, the ultra state-of-the-art Onyx 32.4 brings dozens of new features and enhancements to the party: 100mm Panasonic® faders, premium Onyx mic preamps, completely redesigned analog circuitry with more headroom, greater routing flexibility, new Perkins EQ, and a built-in assignable stereo compressor/limiter. And we're barely scratching the surface.



The Mackie Onyx 32.4 sounds noticeably better than any comparably-priced 32-channel mixer on the market today. And with good reason. The difference starts with premium Onyx mic preamps on every channel (click here for an interactive tour of the Channel strip), which offer greater dynamic range and transparency versus any other mixer mic preamp on the market. Newly designed 4-band Perkins EQ offers the sweet, musical sound of the legendary British consoles of yesteryear, yet with greater filter control. And while the 32.4 is not the first mid-format console to offer an onboard compressor/limiter, we specified a THAT® Corporation 4301 assignable stereo compressor/limiter, and then had it custom tailored specifically for the Onyx 4-bus Series. Finally, overall mixer sound quality and headroom has also been raised, thanks to the use of premium components, completely redesigned summing bus circuitry, and an electronically balanced design throughout the entire signal chain. Taken together, the Onyx 32.4 gives you big, full-range sound and even lower noise than esoteric mixing consoles costing much more.

Although our highly-acclaimed XDR mic preamps set high standards for quality and performance, Onyx mic preamps offer even greater fidelity, headroom and transparency—as well as better radio frequency (RFI) rejection and wider dynamic range than ever before. Numerous magazine and online reviews have confirmed Onyx preamps sound just as good as many "boutique" standalone mic pres—with specs like 123dB total dynamic range, -129.5 dBm Equivalent Input Noise, and 0.0007% Total Harmonic Distortion.

We called on veteran audio engineer Cal Perkins to develop the EQ circuitry for the Onyx Series, and in turn Cal designed an extremely effective and musical 4-band EQ, with sweepable low- and high-mids—perfect for live sound mixing. Called the Perkins EQ, Cal's new circuitry builds on the classic Wein Bridge circuit used in the British mixing desks of the '60s and '70s, providing greater filter and phase shift control. Perkins EQ offers more control over harmonic content than any other EQ on the market, and it's only available on Mackie products.


Compression is an indispensable tool in a sound engineer's arsenal. That's why we integrated a high-quality master compressor/limiter chip from THAT® Corporation into the Onyx 32.4. This assignable analog stereo compressor/limiter was designed and manufactured in the US by veteran analog engineers, offering true RMS Detection and Auto Make-up Gain for extremely accurate and musical results. Controls are provided for Threshold, Ratio and Fast/Slow Attack, and the compressor can be assigned post-fader to the L/R main mix (for system limiting and speaker protection) or pre-fader to Group 1/2 or 3/4 outputs (for grouped signal compression, like drums or background vocals). This reduces the need for separate outboard processing.


If total control over signal routing, talkback/monitor mixing, and external effects processing is what you seek, then look no further—the Onyx 4-Bus Series Master section has everything you've come to expect from a Mackie mixing console, and more. The onboard 6 x 2 Matrix Mixer is the solution to the “not-enough monitor send” blues. Not only can you use the Aux Sends to generate up to six monitor mixes, but the Matrix Mixer can be used to generate two additional independent mixes—ideal for IEM (in-ear-monitor) systems, cry rooms, green rooms or other zoned outputs. Visual monitoring of Solo, Main output and compression/limiting is expertly handled via four, giant 12-segment LED ladders. And even the Sub Groups feature 4-segment LEDs, so you know what signal levels are at glance. Click here for a guided tour to the Master section.

If you plan to use the Onyx 32.4 for live recording, we've included another invaluable feature: convenient balanced Mic/Line direct outputs for every channel. No longer will you need to run a splitter, or take individual direct outs from the board to your tape or hard disk recorder. Thanks to four DB-25 female connectors on the rear of the console (configured with standard Tascam® pin outs), you can quickly route all mic/line signals to an external device. All of these balanced direct outs are pre-fader and switchable via internal jumpers as either pre- or post-EQ. So there are only four cables between the Onyx 32.4 and your recorder—it just doesn't get any easier than this.

Because we at Mackie know how tough the road can be on equipment, we designed the Onyx 4-Bus Series to handle almost anything you can throw at it. Vertical aluminum supports are placed strategically to maximize the structural integrity of the solid-steel chassis. And because these boards get moved around a lot, we designed comfortable carry handles right into the sides—even though they are portable enough to just tuck them under your arm and go.

Designed with a practical and easy to understand layout, anyone from a Sunday morning volunteer operator to a seasoned professional engineer can quickly learn to operate the Onyx 32.4 console. This makes it perfect for a wide range of live applications including churches, small- to medium-sized clubs, touring bands, and rehearsal facilities, just to name a few. With stunning sound quality and renowned Mackie engineering—combined in a full-featured, portable, highly affordable, mid-format mixing console—the Onyx 32.4 is destined to set the new standard.

  • 32-channel / 4-bus premium analog mixer designed for live sound

  • Onyx microphone preamps with class-leading fidelity and dynamic range on every channel

  • 4-band Perkins EQ on every channel for warm, musical sound

  • 6 x 2 Matrix Mixer provides 2 additional mixes for cry rooms, monitors, etc.

  • Built-in assignable stereo compressor/limiter designed by THAT® corporation

  • Giant 12-segment LED ladders for Main output and compressor/limiter

  • 6 Aux sends with Pre/Post switches

  • Two dedicated stereo channels

  • 100mm Panasonic™ faders on all channels, groups and mains

  • Same physical size as the popular SR32•4 mixing console

General Specifications
Frequency Response: Mic Input to Main Output (Gain @ Unity)
+0, –1 dB, <10 Hz to 80 kHz
+0, –3 dB, <10 Hz to 120 kHz
Distortion (THD & IMD): Mic Input to Main Output (@ +4 dBu)
THD: < 0.007% 20 Hz to 20 kHz
         0.003% @ 1kHz typical
SMPTE IMD: < 0.005% (7 kHz/60 Hz, 4:1)
Dynamic Range: >115 dB, Mic In to Main Out
Noise Floor: Signal-to-Noise Ratio:
–87 dBu (ref. +4 dBu, Mic In to Main Out, 32 channels and Main Mix levels at unity)
–89 dBu, (ref. +4 dBu, Mic In to Main Out, 24 channels and Main Mix levels at unity)
Equivalent Input Noise (E.I.N.), 20 Hz to 20 kHz Bandwidth, 150Ω source impedance
–129.5 dBu @ +60 dB gain
Mic Output Noise:
Direct Output: –100 dBu (minimum gain)
Residual Output Noise:
Main Out: –100 dBu (Channel and Main Mix levels off)
Main Out: –83 dBu (32 channels and Main Mix levels at unity)
Common Mode Rejection Ratio (CMRR): Mic In: >70 dB @ 1 kHz, Gain @ maximum
Crosstalk: Adjacent Inputs: < –95 dB @ 1 kHz
Input to Output: < –85 dB @ 1 kHz
Phantom Power: +48 VDC
Equalization: Mono Channel EQ:
High: ±15 dB @ 12 kHz
High Mid: ±15 dB, sweepable from 400 Hz to 8 kHz
Low Mid: ±15 dB, sweepable from 100 Hz to 2 kHz
Low: ±15 dB @ 80 Hz
Stereo Channel (Aux Input) EQ:
High: ±15 dB @ 12 kHz
High Mid: ±15 dB @ 2.5 kHz
Low Mid: ±15 dB @ 400 Hz
Low: ±15 dB @ 80 Hz
Mixer Rated Output: Main Outs: +4 dBu
Aux Send: +4 dBu
Group Send: +4 dBu
Monitor Out: +4 dBu
Matrix Out: +4 dBu
Maximum Rated Output: +21 dBu @ Main XLR and TRS outputs
Maximum Input Levels: Mic Input: +21 dBu, Gain @ unity, pad out
Mic Input: +30 dBu, Gain @ unity, pad in
Line Input: +21 dBu, Gain @ –20 dB
Tape Input: +30 dBu
Stereo Return: +21 dBu
Maximum Voltage Gain:
Mic Input to:
Main Out: 90 dB
Group Out: 80 dB
Aux Sends: 86 dB
Monitor Out: 103 dB
Matrix Out: 105 dB
Phones Out: 103 dB
Line Input to:
Main Out: 70 dB
Group Out: 60 dB
Aux Sends: 66 dB
Monitor Out: 83 dB
Matrix Out: 85 dB
Phones Out: 83 dB
Stereo Return to:
Main Out: 53 dB
Group Out: 43 dB
Aux Sends: 49 dB
Monitor Out: 66 dB
Matrix Out: 68 dB
Phones Out: 66 dB
Input Impedance: Mic Input: 3 kΩ, balanced
Mono Channel Line Input: 34 kΩ balanced
Stereo Returns: 20 kΩ balanced
Talkback Mic: 1 kΩ balanced
Output Impedance: Main Out: 100 Ω balanced, XLR outputs; 300 Ω TRS outputs
Direct Out: 300 Ω
Group Out: 300 Ω
Monitor Out: 300 Ω
Matrix Out: 300 Ω
Aux Sends: 300 Ω
Phones Out: 25 Ω
Channel Level LED (Sensitivity): 0 LED = 0dBu (normal operating level)
VU Meters: Main Left and Right, Compressor Input, 12 segments:
Clip (+20), +15, +10, +6, +3, 0, -2, -4, -7, -10, -20, -30
0 LED = 0dBu
Compressor Gain Reduction, 12 segments: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15 dB
AC Power Requirements: Power Consumption: 120 watts
Universal AC Power Supply: 100 VAC - 240 VAC, 50-60 Hz
Physical Dimensions and Weight: Height: 7.3 in / 185 mm
Width: 39.8 in / 1011 mm
Depth: 21.9 in / 555 mm
Weight: 48.0 lb / 21.8 kg



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