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Metric Halo LIO-8 mkIV

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Pris 37.613,- 33.540,-
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LIO-8 mkIV

It’s All About the Sound…



A complete, modular, expandable Recording & Mixing Console with world-class converters, a studio full of outboard gear and a professional Atmos capable analog monitor controller. 

Integrated with a future-proof computer interface.


LIO-8 mkIV Key Hardware Features

Whether you are on location, in the studio or the mastering room, the LIO-8 mkIV has what it takes for you to get the job done.

LIO-8 mkIV is built on Metric Halo’s core 3d Technology, so it interoperates seamlessly with all existing MH 3d interfaces.

Since it is amazingly flexible, expandable and future-proof by design, your system always scales to meet your needs. Each unit includes these hardware features:

  • Metric Halo’s unique 3d Core Digital Engine with MHLink
  • 8 channels A/D with Analog Trim
  • 8 channels D/A with Analog Gain
  • Stereo Headphone 
    • Dedicated HP D/A and Analog Gain
  • Ultra-low converter latency
    • Converter latency reduced by 85% compared with previous generation
    • Round-trip through Converters + Mixer + DSP + Monitor:
        ≈ 0.9ms @ 44.1k
        ≈ 0.2ms @ 192k
  • 2 channels Guitar/Bass DI inputs
  • 8 channels AES Output
  • 8 channels AES Input
  • MIDI I/O
  • 128 Channel x 64 bus mixer
  • Integrated DSP
  • Full support for 192k
  • Detailed Front panel metering
  • FP control with dedicated gain knobs
  • IR Remote Control support
  • MH EdgeBus Card slot
  • MHLink Gigabit Ethernet connectivity
  • USB-C connectivity
  • Low power, cool-running design with no fans

The mkIV excels in these key areas:

• Tracking

• Mixing

• Mastering

• Live

• Monitors

• Production

• Remote Mic Pre

• A/D/A

• Active Analog Split

• Digital Snake

• DSP Processing

• Format Conversion

• Headphone Amp

• DI

• Meter Bridge

• Monitor Control

• Cue Playback

• Session

• IR Remote

• Tactile Control

• Wireless Control


Integration for the Win

By implementing all the functions of a complete end-to-end signal chain solution in a single package, the LIO-8 mkIV is able to provide unprecedented capability and quality in a lightweight, low-power, single rack space unit. This integration has significant benefits in the form of reduced setup time and greater reliability, reduced cabling, weight, power consumption and cost, even as it provides unprecedented flexibility and performance.

The MHLink routing and transport architecture allows you to build a system with units distributed up to 100 meters apart with no added latency.

MHLink's auto-configuration and hardware aggregation make it so the entire system appears to the host computer as a single unified interface. Audio, command and clock transport with up to 256 channels of audio (at 192k) is accomplished with light-weight, inexpensive, readily available Cat 5e cabling.

The new mkIV design is eco-friendly and uses very little energy to provide its incredible performance and power. Even when every mic channel is powering a 48v phantom mic, the LIO-8 mkIV only consumes 25 watts, and without phantom uses less than 21 watts.

This low-power design allows the mkIV to run cool and stable. No noisy fans required.

Metric Halo Sound

The sound of an audio product is more than the the sum of its parts. You can’t simply look at the components used and determine how something is going to sound. Excellent audio requires careful attention to detail and the tuning of every element of the entire system; this includes the analog stages, the power system, the clock and the converter itself. As all of these interact with each other in nonlinear ways, it is the system that determines the performance, and not any of the individual parts.

The A/D/A converters in the LIO-8 mkIV are DC-coupled to the analog I/O stages so they introduce extremely low phase distortion. The D/A has no low-frequency filtering. The A/D converters have an extremely low frequency DC blocking filter that calibrates the input path and removes DC offset with minimal phase shift.

Every element of the design combines to give you a warm, open 3-dimensional sound that is highly revealing and yet totally natural. Metric Halo mkIV sets a new standard.

It’s digital with soul.

Optional Preamps

The LIO-8 mkIV supports adding up to 8 channels of Metric Halo’s renowned ULN-R preamps in 4 channel blocks. These boutique preamps are famous for their pristine, low-distortion, completely unveiled sound.

The ULN-R preamp provides up to 90 dB of digitally-controlled analog gain in precisely recallable 0.5 dB steps. Each input supports independently switchable P48 phantom power.

The combination of the super transparent ULN-R preamp and Metric Halo’s exclusive insertable Character Component Modeling Processing provides flexibility and sound quality that’s unavailable on any other device. You can transition from a wire-with-gain pre to a gooey tube pre or anything in between; every input can have the right Character for the sound you want.

The preamp input path on the LIO-8 mkIV always has preamp gain control and has DC blocking for the phantom power, it also supports input levels of up to +20dBu with no fidelity reducing pads, so you can handle high SPL with sensitive mics as well as you can handle extremely low SPL with insensitive mics (like ribbon mics and low output dynamics) while maintaining ultra-low noise.

The high maximum input level of +20dBu also means that you can use the mic pre input path as an alternative line input path. This feature can be used with the monitor controller to access an additional 8 selectable analog inputs as external sources.

The LIO-8 mkIV input path features an integrated analog send (pre A/D converter) which allows the unit to be used as remote controlled analog preamp. MHLink connectivity and control means that your preamps can be really remote (up to 100m away from your control interface) when you need them to be.

The preamps also offer a send/return mode where the amplified signal from the preamp is sent to the analog send and the line input is used for the return to the A/D converter - this allows you to patch analog processing between the preamp and the converter. Finally, you can use the analog send to provide the pre-amplified signal to a backup recording or mixing system; this is a fully analog split that represents a true backup signal with no digital dependencies.



Monitoring is critical to the production process at every stage; you need to be able hear exactly what you are working on. Your monitor chain will be limited by the weakest link in the chain. The LIO-8 mkIV integrates a transparent digitally controlled analog monitor controller to ensure that you can connect directly to your reproduction chain without having to reduce the fidelity of your signal with an inferior monitor control system.

mkIV hardware includes a relay driven shunt mute circuit on all the analog outputs that prevents transients from getting into your power amps and speakers. The mute is designed to be completely out of the circuit under normal monitoring operations. It automatically protects your monitors during power cycles and sample rate changes.

The Monitor Controller in the LIO-8 mkIV provides sophisticated monitor control features that are only available in dedicated monitor controllers that surprisingly cost more than the LIO-8 mkIV.

These features include:

  • Multiple source selection
  • Multiple speaker output selection
  • Output paths can share speakers
  • Per speaker gain and delay
  • Per speaker solo/mute control
  • Output path calibration support
  • Multichannel support from Stereo up to 7.1.4 Surround (Dolby Atmos®)
  • Mono fold-down
  • Mute and Dim
  • Analog gain control
  • Talkback
  • Listenback
  • Multiple cue output support
  • PFL/AFL integration with the mixer

In addition to all these high-end features, the MH Monitor Controller provides unique support for per-output-path configurable signal processing including EQ, Bass Management and protective limiting. Each output path can have its own signal processing, even if the paths share speakers. This allows you to configure alternate monitoring setups with one monitoring system (for example, you could configure the signal processing to provide a band-limited monitoring path or a path that lacks subwoofer reinforcement).

Each LIO-8 mkIV includes a high quality headphone amplifier with dedicated D/A conversion (which is the same quality as the primary D/As in the system), and digitally controlled analog gain control. So you don’t need to add a headphone amp to your system. By default the headphones are configured as a parallel Cue output multed from the Monitor Controller, but you can drive the headphones with an independent mix or you can make them an alternate output for the monitor controller.


Cue Control

In addition to monitoring the mix in your control room, multitrack production requires providing multiple output cues to performers, producers and/or broadcast feeds.

The Monitor Control in 3d is enhanced by a sophisticated Output Cue section that provides you with an arbitrary number of output controls. Each cue can be driven from any of the busses in the system, or it can be set to derive its input from the currently selected source in the Monitor Controller (MC).

Since each Cue can be driven by a separate mix bus from the mixer, they are perfect for routing and controlling independent headphone mixes for individual performers.

Cues can be configured to listen to PFL/AFL (or not). So for producers and engineers, the cue can follow PFL/AFL Solo in the mixer while performer and broadcast cues are unaffected by soloing.

Each cue has an independent output path which can be set to any of the MC supported output types. Each cue controller uses the MC engine for its control of routing, gain, delay and output graph processing, so it can do all the things the MC can do.

Cues form the basis of the routing points for Talkback and Listenback.

Talkback provides the ability to route a specific input to any sub-set of the cues in the system; it also allows you to control the amount that the Cue source signal is dimmed when talkback is active. The Talkback signal is mixed with the selected source.

Listenback provides the ability to route the source that the engineer is currently monitoring through the Monitor Controller to any subset of the cues in the system. This allows playing back a mix of the take to any or all of the monitoring cues in the system without having to re-patch.

Stand-alone Operation

Flexible signal routing and sophisticated patch and preset management systems as well as a comprehensive set of front panel controls are also featured in the LIO-8 mkIV. The mkIV’s front-panel controls allow the unit to function equally as well as a stand-alone Mic Pre/Converter system. In standalone mode, the mkIV operates with the converters directly routed to and from the AES I/O, and the analog sends allow purely analog operation of the optional preamps.

As a standalone converter, the LIO-8 mkIV provides a 24bit/192kHz eight channel front-end for any recording system. It also functions seamlessly as an analog monitor controller, making it ideal as a digital headphone amp and studio monitor controller.

Boot States / Snapshots

LIO-8 mkIV has support for saving and recalling hardware Boot States and Snapshots.

Boot States are automatically applied by the hardware when it is booting up. Snapshots may be recalled manually from the front panel.

When you save a snapshot to the hardware, everything required to restore the current running state of the hardware is gathered up and stored on the hardware. This includes:

  • Routing
  • Mixer Gains
  • Pans
  • Mutes
  • DSP plugins
  • DSP settings
  • Interbox Routing
  • Clock source
  • Sample Rate
  • Computer Routing (including SCP)

On boot/recall all the settings listed above are set on the hardware (including all the connected units in an MHLink domain. The LIO-8 mkIV also provides extensive front panel controls that allow you to change a wide variety of hardware parameters after the recall of the boot state. This combination of features allows you to configure your hardware for Standalone operation - for example you can configure your LIO-8 mkIV as a standalone Mic Pre, A/D/A converter, Format Converter or Monitor controller (or any combination of these functions).

Features in Detail

  • 8 Channels of stunning 192k A/D converters
    • Utterly transparent, spacious, detailed A/D conversion
    • Digitally Controlled Analog Input Trim
  • 8 Channels of stunning 192k D/A converters
    • Warm, engaging, expansive and immersive D/A conversion
    • DC-coupled for ultra-low phase distortion
    • Digitally Controlled Analog Output Trim
    • All D/A outputs Relay Shunt muted for direct connection to amps/monitors
  • 2 Channels of stunning 192k D/A converters with integrated headphone amp
    • Featuring the same high-quality DC-coupled conversion as the main DACs
    • Dedicated, digitally-controlled high-power headphone amplifier
  • Open slots for adding up to 8 Channels of Exceptional Remote Controllable Ultra-Low-Noise Clickless Mic Preamps
  • Analog Send analog mult of line inputs (pre A/D)
  • 2 Channels of Exceptional DI inputs suitable for instrument or turntable inputs
    • Ultra-High-Z for no instrument loading
    • Balanced or unbalanced operation
    • Jumper configurable pre-trim gain
  • Integrated Surround Monitor Controller
    • Provides switching between any set of user specified sources (Host, USB, AES, Analog, ADAT, MADI or Mix)
    • Analog gain control for monitor output from Front Panel or computer
    • Mute, Dim, and Mono Fold-down
    • Non-destructive routable PFL/AFL Solo monitoring
    • Talkback and Listenback to Cue points
    • Independent channel level and delay calibration for each output path
    • Flexible B-Chain processing integrated in Output paths
    • Supports input and monitor paths from Mono to Atmos 7.1.4
  • 8 Channels of 192k capable AES Inputs and Outputs
    • Available as computer I/O or direct routed I/O for converters
    • Support full channel count at all sample rates
    • Professional interfacing
  • Open EdgeBus Card Slot available for Expansion via any one of:
    • AES/SPDIF EdgeCard (4 in/4 out)
    • DB-25 AES EdgeCard (8 in/8 out)
    • SPDIF + MIDI EdgeCard (2 in/2 out + MIDI I/O)
    • SPDIF + 2x ADAT EdgeCard (18 in/18 out)
    • 2x SPDIF + 2x ADAT EdgeCard (20 in/20 out)
    • 4x ADAT EdgeCard (32 in/32 out)
    • 2x MADI Optical EdgeCard (128 in/128 out)
    • 1x MADI Optical + 1x MADI Copper EdgeCard (128 in/128 out)
    • 4x MADI Copper EdgeCard (256 in/256 out)
  • Comprehensive Front Panel Controls
    • Full support for standalone converter operation
      • Sample Rate selection
      • Clock source selection
      • Input source selection
      • Phantom power control
    • Tactile Control of Input and Output gains
      • Gain level indication with MH Digital Dual Vernier Technology
      • Numeric gain level indication while changing gains
    • Tactile Control Headphone level
    • Tactile Control Monitor Controller gain (mono - 7.1.4)
    • Preset recall
    • Multichannel gain linking control
    • Monitor Controller control surface
    • User-controllable brightness
    • User-controllable knob sensitivity
  • Comprehensive, High Resolution 15 Segment Precision Front Panel Metering
    • Real, functional metering for analog inputs and outputs
    • Unique ‘Meter on knob’ functionality
    • Multi-color signal level/presence metering for AES inputs and outputs
  • Comprehensive Clocking (Internal, Word Clock, AES, MHLink, EdgeBus)
  • Dedicated internal clock sources for all rates
  • Dedicated MIDI I/O
    • MIDI Input and Output on standard DIN connectors
    • MIDI transported to computer
  • Dedicated SMPTE LTC I/O for Timecode without sacrificing any audio channels
    • Properly conditioned and band-limited SMPTE I/O on TRS balanced connections
    • Available to any CoreAudio application as audio streams
    • Directly routable to Session SMPTE decoder
  • Rock-solid, time-tested sixth-generation software and drivers
  • Integrated Mixing and Deep Instantiable DSP Processing (Includes Full +DSP License)
    • Fully configurable multibus mixer with surround support (up to 7.1)
      • Full Send/Return architecture
      • I/O Inserts
      • Pre and Post Insert routing
      • Auto-channel input monitoring with Session
      • Latency compensated Aux and Group Buses 
      • On-strip Aux Sends 
      • Aux on Main Surface Mode 
      • Optional non-destructive PFL/AFL solo modes 
      • Optional per-strip Hard Mutes 
      • Link Groups 
      • Mute Groups 
      • DCAs 
      • Ultra-low latency, on-the-metal monitoring
      • Insert model for inserting zero-latency plugins
    • Insertable +DSP plugin graphs for configurable processing
    • Insertable graph macros for complex, pre-configured processing
    • Includes over 100 world-renowned Metric Halo processing plugins, including:
      • ChannelStrip
      • DirtyDelay
      • Multiband Dynamics
      • Multiband Expander
      • TransientControl
      • MHCharacter
      • HaloVerb
      • Precision De-esser
      • Thump
      • SuperGate
      • SonicEQ
      • MBEQ
      • MBParallel 1, 2 & 3+4
      • MBGoodMath
      • MIOStrip
      • Dynamics (Compressor and Limiter)
      • EQ (6 band and 12 band)
      • Signal Processing primitives
      • Crossovers
      • and much more…
    • Per-channel and Per-bus Insertable Character™
  • MHLink Interfacing between boxes with automatic box-to-box:
    • Routing
    • Clocking
    • Interface Aggregation
    • 1 Sample Routing Latency across entire domain
  • Ethernet Interfacing to computer with MHLink Audio
    • Supports macOS v.10.9.x and newer
    • 128x128 channel interface @ 192k
  • Driverless USB Class Audio Interfacing
    • macOS v.10.6.8 and newer
    • iOS (iPhone)
    • iOS (iPad)
    • Win 10 and newer
    • Android
    • Linux
    • Other USB UAC2 hosts
  • Bidirectional Control Surface Support
    • Integrated Front Panel Tactile Controls
    • Mackie Control Protocol Control Surfaces
    • Eucon Control Surfaces
    • Avid Control via iPad/iPhone/Android
    • IR Remote
  • Session: Integrated Multichannel Tracking DAW
    • Multichannel, multi-box DAW-style high-performance recorder
    • Multitrack DAW-style playback with cueing
    • Overdub and editing support
    • Integrated segment fades and multisegment overlap
    • Exceptional Stability and Sound Quality
    • Realtime waveform display
    • Extensive File Format support (BWF, WAVE, AIFF)
    • BWF time-stamping from TOD or LTC (any input channel or dedicated SMPTE input)
    • Support for extensive BWF metadata
    • Support for extensive iXML metadata
    • Support for limiting record file size and seamless file breaking
    • Seamless manual file breaking (with time-stamping)
    • Support for mirrored recording (recording to multiple drives at once)
    • Pre-roll/Pre-record
    • Dreamcatcher™ Level Based trigger
    • Timecode based trigger
    • Monophonic and polyphonic recording (determined by source strip width)
    • Support for overall poly-file recording for film/field recording workflows
  • DC-Powerable
    • Supports battery power with no inverter
    • External power via XLR-4 Locking Connector
  • High quality, custom designed formed powder-coated aluminum case
    • Strong
    • Light weight
    • Scratch and fingerprint resistant
    • Smooth contours for snag-free transportation in a gig-bag
    • Rack-mountable with included rack-ear kit
  • Exceptional Power Performance (only 20 Watts nominal / 25 Watts max)
  • Silent, fan-less design
  • Low mass (6 lbs / 2.7 kg)
  • Extremely Compact (everything in 1 RU)
  • Includes MHLink and USB-A to USB-C Cable kit
  • Includes External Power Supply and IEC cable
  • Future-Proof, Expandable, and software-enhanceable



System Requirements


  • Any Mac that supports macOS 10.9.x or newer with a 64-bit Intel or Apple Silicon Processor
  • One of:
    • USB port
    • Built-in Gigabit Ethernet Port
    • Thunderbolt Gigabit Ethernet Adapter
    • Thunderbolt Dock with Gigabit Ethernet Adapter
    • USB3 to Gigabit Ethernet Adapter
    • PCIe Gigabit Ethernet Card


  • macOS 10.9.x or newer required


  • All CoreAudio compliant software is compatible with LIO-8 mkIV, including:
    • Cubase
    • Digital Performer
    • GarageBand
    • iTunes
    • Abelton Live
    • Logic
    • Studio One
    • Bitwig
    • Nuendo
    • Resolve
    • MixBus 32c
    • soundBlade
    • Pro Tools
    • Final Cut Pro
    • and hundreds more…

What’s Included in the Package

Each LIO-8 mkIV includes the following items:

  • One LIO-8 mkIV unit
  • One IEC Power Cord appropriate for your area
  • One 19-volt 60-watt world-ready external power supply
  • One 2’ and One 10’ CAT5e Ethernet Cable
  • One USB-A to USB-C Cable
  • Two Rack Ears with fasteners
  • Rubber feet
  • Configuration jumpers
  • Warranty/Registration Card



Differences between LIO-8 mk IV and LIO-8 3d

LIO-8 mk IV features:

  • A new analog and converter design with even more detail, body and soul
  • A huge reduction in converter round trip latency (RTL)
  • Next-gen design optimized for low-latency unity-gain analog loops
  • A relay-based output mute system for click & pop-free power cycles
  • 40% reduction in power consumption - it runs cooler and is better for the environment

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