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MOTU unveils FireWire audio interface

updated 10:35 am EST, Mon January 28, 2008

MOTU's 828mk3 unveiled

MOTU has unveiled the 828mk3, a cross-platform FireWire audio interface with on-board effects and mixing functionality. The 828mk3 features a 32-bit floating point DSP for digital mixing and effects processing, more I/O, 192kHz operation, and true hi-Z guitar inputs. The device also offers signal overload protection, digitally controlled analog input trims on all inputs, two banks of ADAT/TOSLink optical, and MIDI I/O. The 828mk3 will ship in February for $800.

Digital mixing and effects processing

The 828mk3 provides 28 inputs and 30 outputs in a single rack-space form factor. All I/O is routed to a new on-board 16-bus digital mixer driven by hardware-based DSP with 32-bit floating point precision. The mixer allows users to apply no-latency effects processing to inputs, outputs or busses directly in the 828mk3 hardware, independent of the computer, and effects can be applied when the 828mk3 is operating stand-alone (without a computer) as a complete rack-mounted mixer. Input signals to the computer can be recorded wet, dry, or dry with a wet monitor mix (for musicians during recording, for example).

Effects include reverb, parametric EQ and compression/limiting. The 828mk3's Classic Reverb provides five different room types, three frequency shelves with adjustable crossover points, shelf filtering, and reverb lengths up to 60-seconds. Two forms of compression are supplied: a standard compressor with conventional threshold/ratio/attack/release/gain controls and the Leveler, an accurate model of the legendary LA-2A optical compressor, which provides vintage, musical automatic gain control. The EQ section provides 7-band parametric EQ modeled after British analog console EQ's, featuring four filter styles (gain/Q profiles) to effectively cover a wide range of audio material. LP and HP filters are also supplied with slopes that range from 6 to 36 dB.

The 838mk3's effects architecture allows users to apply EQ and compression on every input and output (a total of 58 channels), with enough DSP resources for at least one band of parametric EQ and compression on every channel at 48kHz. However, DSP resources are allocated dynamically and a DSP meter allows users to keep tabs on the 828mk3's processing resources. Each input, output and mix bus provides a send to the Classic Reverb processor, which then feeds reverb returns to mix buses and outputs, with a selectable split point between them to prevent send/return feedback loops.

Overload protection

Individual 48V phantom power and 20 dB pad switches are supplied for each of two front-panel mic/guitar combo jacks, which are both equipped with preamps. Both inputs also include a switch that toggles between the low-impedance XLR mic input and the true (high-impedance) quarter-inch guitar input jack. Both mic/guitar inputs feature V-Limit, a hardware limiter that helps prevent digital clipping from overloaded input signals. With V-Limit enabled, signals can go above zero dB (where limiting kicks in) to as high as +12 dB above zero with no distortion due to digital clipping. Users can apply additional protection to the mic/guitar inputs by enabling the 828mk3's Soft Clip feature, which engages just before clipping occurs and helps reduce perceptible distortion.

Digitally controlled analog input trim

All of the 828mk3's analog inputs include digitally controlled analog trim controls that allow adjustments in precise 1 dB increments. The mic/guitar input trims are adjustable using front-panel digital rotary encoders that provide feedback in the front panel LCD. All analog inputs, including eight TRS analog inputs, can be trimmed using the CueMix FX control software for Mac and Windows systems. The software allows users to fine-tune trim settings for synths, effects modules and a wide variety of analog inputs for optimum levels. Users can also save different trim configurations as files on disk for instant recall.

CueMix FX software

All settings in the 828mk3 are accessible from the programmable front-panel backlit LCD or via the CueMix FX control software. CueMix FX is a completely new software front-end with graphic mixing, graphic editing of parametric EQ, and a tabbed interface for quick access to all features in one window. Three separate tabs show inputs, mix busses (eight stereo busses) and outputs. Users click a 'Focus' button on any channel or bus to edit its settings in another area on the right-hand side, which provides separate tabs for graphic editing of parametric EQ, compression, and other effects. Each channel displays a graphic thumbnail of EQ curves, compressor settings, and other channel specific parameters. A section for talkback and listenback accompany CueMix FX's ability to operate side by side with any host audio software for Mac or Windows, and the software is controllable from the Mackie Control Universal Pro automated work surface.


The 828mk3 allows users to connect a wide variety of studio gear that includes microphones, guitars, synths, keyboards, drum machines, and effects processors. In addition to the two mic/guitar preamp inputs on the front panel, the 828mk3 provides two independent headphone jacks with independent volume knobs, one of which also controls the XLR main outs on the rear panel. Users can program the "master vol" knob to control any combination of outputs (analog and/or digital), such as monitor output for an entire 5.1 or 7.1 surround mix.

Eight balanced (TRS) 24-bit analog inputs and outputs, as well as two XLR main outs and the two preamp inputs, can operate at sample rates up to 192kHz (a total of 10 analog inputs and outputs). Two optical banks provide 16 channels of ADAT optical at 48kHz, eight channels of S/MUX optical I/O at 96kHz, or two banks of stereo TOSLink at rates up to 96kHz. The banks operate independently, allowing users to mix and match any optical formats. RCA S/PDIF connectors also supply independent stereo digital I/O.

Each mic input has a corresponding rear panel send that allows users to insert outboard gear before the signal goes digital, and any input can function as a return.


The 828mk3 features Direct Digital Synthesis (DDS), a DSP-driven phase lock engine and internal clock source that produces imperceptibly low jitter characteristics (below the noise floor), even when the 828mk3 is resolved to an external clock source via either word clock or SMPTE time code. The 828mk3 can directly resolve to (or generate) time code via a dedicated quarter-inch time code input and output, without the need for an extra synchronizer.

Expansion, drivers and AudioDesk

As with other MOTU FireWire interfaces, the 828mk3 includes two FireWire jacks that enable daisy-chaining with additional MOTU FireWire audio interfaces or other devices. The 828mk3 is also fully compatible with the 8pre, a single rack MOTU interface that adds eight mic preamp inputs to the 828mk3.

The 828mk3 provides CueMix FX and drivers for Mac OS X and Windows XP/Vista for cross-platform compatibility with virtually all audio software via WDM/ASIO/Core Audio drivers, according to the company. The included AudioDesk workstation software for Mac provides 24-bit recording/editing and 32-bit mixing/processing/mastering.

by MacNN Staff



  1. tutorcat

    Joined: Dec 1969


    too good for me

    I'm looking for mixer for do the Podcast. I think this one too good and too expensive for me. Anyone can recommend a good and cheaper one for doing podcast with 3-5 microphones input ?

  1. Grrr

    Joined: Dec 1969



    Im still using a MOTU 828 mk1. Its kinda old now as computer hardware goes. But its been great and is still well supported by MOTU. Utterly reliable with great sound quality. Im sure these new MK3's are good too. but I have no need for the new features.

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