2882 Features ULN-2 Features +DSP Overview MIO Console MIO Drivers Manuals

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Mobile I/O
The Ultimate Digital Front End

Mobile I/O ULN-2+DSP

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Truly Portable, Completely Pro Digital Audio Hub

The Mobile I/O ULN-2 is a best in class FireWire interface that provides 4 inputs and 6 outputs of comprehensive, simultaneous I/O, 24/96kHz A/D/A conversion with two channels of Ultra Low Noise preamps (72dB of gain with an E.I.N. of –130.5dBu), two channels of digital I/O as AES and S/PDIF, balanced send/return path, and individual monitor and headphone outputs, each with front panel level control. The ULN-2+DSP is the only unit in its class with an on-board processing chip, allowing you to use world renowned Metric Halo signal processing effects without sacrificing your computer's processing power.This one rack space 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.

ULN-2 is the perfect tool for capturing audio wherever inspiration hits, in the studio or on the road. Well suited to any recording situation, the ULN mic preamps provide exceptional detail and an ultra-fast slew rate. 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.

Flexible signal routing and sophisticated patch and preset management systems are also featured in the new +DSP version, including a front panel, nine-preset register for standalone operation. ULN-2+DSP'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. 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+DSP supports a variety of applications. For studio recording, it provides a very 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+DSP to record and edit on the road, in the hotel, while traveling, or anywhere that inspiration strikes.

The ULN-2+DSP 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+DSP can operate as a soft-synth mixer and I/O interface. The ULN-2+DSP 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.

All Mobile I/Os have a SHARC DSP chip onboard that powers the versatile MIOConsole 80bit WIDE mixer, router, and control application. Use MIOConsole to route any input to any output, giving you more powerful mixing possibilities than any unit on the market. All channels have 24 bit, 96kHz converters, making this the perfect tool for digital recording. Add even more power to your rig with +DSP, Metric Halo's revolutionary approach to taking your processing plugins with you to rehearsals, the big show, or to the studio.


 Key Features
  • 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 volume control
  • AES-S/PDIF Digital I/O with selectable SRC
  • Onboard 80-bit multibus mixer for near-zero latency mixing and routing
  • 4-pin XLR power port for compatibility with most location battery systems
  • 9 front panel preset system/routing memories for stand-alone operation
  • FireWire Connectivity
  • Compact, light, and bus-powerable

Technical Specifications (PDF)


ULN-2 Technical Specifications
Mic Inputs
Stepped Gain Range +6 dB – +72 dB (6 dB Steps)
Gain Range with Trim -14dB – +70 dB
Input Impedance 3.3 kΩ
Harmonic Distortion @1kHz
(+9dBu in @ 6 dB Gain)
Intermodulation Distortion
1k component
(19 kHz/20kHz @ +8dBu)
-96 dBu
Equivalent Input Noise (E.I.N.)
20 Hz – 20 kHz Flat @ 72 dB Gain
150Ω Source -130.5 dBu
50Ω Source -132.0 dBu
0Ω 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/
hotswap protected
Physical Specs
Controls Stepped Gain (12 steps 6dB – 72 dB)
Continuous Attenuator on return
Attenuation link
Mic/Line Select switch
Independent Monitor Volume Controls
Independent Phantom Power Controls
[W x D x H]
13.5” x 8.25” x 1.73”
34.3 cm x 21 cm x 4.4 cm
Weight 4 lbs
1.8 kg
Rating 8 watts @ 9 – 30v DC
Connectors 2.1 mm Coaxial
4 pin XLR Broadcast Battery



Mobile I/O ULN-2 Routing Matrix Schematic
Mobile I/O ULN-2 Routing Matrix Schematic
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