Mobile FireWire Expanded Interface (with DSP)

OUR PART #: ULN2-EXPANDED+DSP Write the First Review.

NOTE: This version of Metric Halo's ULN2 includes their +DSP License.
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NOTE: This version of Metric Halo's ULN2 includes their +DSP License.

Metric Halo's ULN-2 Expanded integrates world-class analog stages, excellent A/D/A conversion, and the Mobile I/O line's digital mixing, routing and FireWire connectivity.

The ULN-2 Expanded is a portable, high–quality, modular FireWire–based multi-format audio converter, interface, and processor for professional audio applications.  The ULN-2 is equipped with two balanced analog inputs on Neutrik™ combo connectors, two channels of Digital I/O (AES/EBU and S/PDIF), eight channels of ADAT optical I/O with switchable TOSLINK support, two balanced analog outputs (1/4" TRS), two balanced monitor outputs for connecting directly to power amps and self powered monitors, as well as wordclock in/out and 2 IEEE 1394 FireWire connectors that support 400 Mbs operation.

ULN stands for "Ultra Low Noise" and the Mic Pres in ULN-2 live up to the name.  Providing massive gain (up to 72 dB) with an EIN of -130.5 dBu, fantastic detail and an ultra-fast slew rate, the ULN Mic pres are up to the most demanding recording situations you can throw at them.

The ULN-2 also features balanced analog inserts for each input.  This lets you use ULN-2 as a standalone analog Mic pre/direct box; use the sends as an active splitter to drive a backup recorder, or even patch in analog dynamics processing between the Mic Pre and the integrated 24bit/96kHz A/D converters.

The 4-pin XLR power port on the ULN-2 allows you to power the unit with a variety of readily available broadcast battery systems.  The 4-pin power port is compatible with power sources having the following characteristics: 9-30V DC, Pin 4 Hot, 15 Watts.

ULN-2 is the perfect tool for capturing audio.  Equally suited to all sources, from condenser mics to the lowest-output ribbon mics, you can choose your mic and your placement with no concern about the performance of the preamp.

Coupled with Metric Halo’s exclusive Character processing, the ULN preamps are flexible and some of the better sounding pres available today.  You can transition from a wire-with-gain to a gooey tube pre with one click of the mouse, and every input can have the right character for the material you are recording.

Fully balanced analog inserts on TRS connectors allow outboard analog dynamics processing to be introduced between the mic pres and the A/D converters.  Wordclock I/O and 4-pin XLR power port (for use with typical broadcast camera batteries) complete the rear panel connections of this highly portable device.

The ULN-2 Expanded is the only unit in its class with an on-board processing engine that supports fully instantiable processing, allowing you to use Metric Halo's unique signal processing effects without sacrificing your computer's processing power or introducing any additional latency in your monitor path.  From MIOStrip to HaloVerb, the ULN-2 Expanded comes with all the basic production processing you need. This 1 RU audio interface has the ability to run entirely from the FireWire bus of a laptop computer or from any DC power source (9V-30V), making it truly and completely mobile.

A unique feature of the Mobile I/O system is that MIOs work well individually or as a group. Mix and match 2882 and ULN-2 units to create a system that meets your needs for track count and preamp power.  Adding a unit to the system organically increases the DSP power of the system, so that your DSP always scales with your I/O.  Break your system up for small gigs when playing out or add the units of your mates to build a huge system when required.  By standardizing on Mobile I/O, each member of the band can have superior quality while working alone, and the band can have huge track counts when playing together.

Flexible signal routing and sophisticated patch and preset management systems are also featured in the ULN-2 Expanded, including a front panel, ten-preset register for standalone operation.  ULN-2's front-panel recall system allows the unit to function equally as well as a stand-alone Mic Pre/Converter system.  In standalone mode, the ULN-2 operates with the converters directly routed to and from the AES/SPDIF I/O, ADAT or TOSLINK.

As a standalone converter, the ULN-2 provides a 24bit/96kHz stereo front-end with ultra-low noise mic pres for any recording system.  It also functions seamlessly as a digital monitor controller, making it ideal as digital headphone amp and studio monitor controller.

The ULN-2 Expanded supports a variety of applications.  For studio recording, it provides a high-quality interface to a DAW, offering sound processing or simple file transfer between workstations.  Its exceptional sound quality is the perfect complement to the studio's existing analog to digital conversion chain.  Songwriters and engineers can use the ULN-2 Expanded to record and edit on the road, in the hotel, while traveling, or anywhere that inspiration strikes.

The ULN-2 Expanded is suitable for broadcast applications, too.  It offers instant playback of two individual stereo sends for music cues or sound effects.  The compact package and portable power features mean that the unit can go anywhere users need to work, and make on-site fixes or edit location recordings without the need to send files back to the studio, saving valuable time before air.

In the live performance arena, in addition to operating as a remote recorder for archiving performances or to play out backing tracks and musical cues, the ULN-2 Expanded can operate as a soft-synth mixer and I/O interface.  The ULN-2 Expanded is also a great addition to a live sound engineer's setup, providing a simple and efficient tool for analysis and system venue tuning with SpectraFoo.


  • 2 Mic/Line/Instrument analog inputs on Neutrik Combo connectors
  • Balanced TRS analog sends and returns for analog inputs
  • 2 analog outputs on balanced TRS connectors
  • 24bit/96k converters on all channels
  • Headphone amp with front panel volume knob
  • Balanced stereo master control room monitor output with front panel volumecontrol
  • AES-S/PDIF Digital I/O with selectable SRC
  • 8 channels all new ADAT I/O with switchable TOSLINK support
  • v.5 Configurable mixer for near-zero latency mixing and routing
  • Metric Halo's unique instantiable +DSP processing
  • 4-pin XLR power port for compatibility with most location battery systems
  • 10 front panel preset system/routing memories for stand-alone operation
  • FireWire Connectivity
  • Compact, light, and bus-powerable
  • Total recall with MIO Console
  • OS X drivers with multi-box support


Mic Inputs:

  • Stepped Gain Range: +6 dB – +72 dB (6 dB Steps)
  • Gain Range with Trim: -14dB – +70 dB
  • Input Impedance: 3.3 kOhm
  • Harmonic Distortion @1kHz (+9dBu in @ 6 dB Gain): 0.0005%
  • Intermodulation Distortion - 1k component (19 kHz/20kHz @ +8dBu): -96dBu

Equivalent Input Noise (E.I.N.) - 20 Hz – 20 kHz Flat @ 72 dB Gain:

  • 150Ohm Source: -130.5 dBu
  • 50Ohm Source: -132.0 dBu
  • 0Ohm Source:-134.0 dBu

Frequency Response:

  • 18 Hz – > 20 kHz: ± 0.1 dB
  • 8 Hz – > 50 kHz: ± 1.0 dB
  • 3 Hz – >100 kHz: ± 3.0 dB

Crosstalk @1kHz:

  • Trim link engaged: -107 dB
  • Trim link disengaged: -132 dB


  • Max. Gain: 72 dB
  • Preamp Headroom: 20 dB above Digital Clip
  • Phantom Power: +48v Regulated, high current, individually switchable,P48 test compliant, short circuit/hot-swap protected

Physical Specs:

  • Control:
    Stepped Gain (12 steps 6dB – 72 dB)
    Continuous Attenuatoron return
    Attenuation link
    Mic/Line Select switch
    Independent MonitorVolume Controls
    Independent Phantom Power Controls
  • Dimensions: 13.5" W x 8.25" D x 1.73" H (34.3 x 21 x 4.4 cm)
  • Weight: 4 lbs (1.8 kg)


  • Rating: 8 watts @ 9 – 30v DC
  • Connectors:
    2.1 mm Coaxial
    4 pin XLR BroadcastBattery

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