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RME

collapse expand iconDescription

Compact Design With Studio-Grade Power

The RME Fireface UCX II delivers a professional audio interface in a half-rack format—perfect for compact studio and mobile rigs. It offers 40 channels of analog and digital I/O over USB 2.0, including mic/line inputs, ADAT, AES/EBU, SPDIF, MIDI and word clock. All analog outputs are DC-coupled, enabling control voltage output for modular synths and creative routing. With plug-and-play installation for Windows and Mac, this interface is ready to handle your workflow right out of the box.

Mic Pres, SteadyClock FS and Stand-Alone Flexibility

The UCX II includes two high-performance mic/line combo preamps and two instrument-ready line inputs on the front panel. RME’s SteadyClock FS technology reduces jitter to deliver transparent AD/DA conversion across all formats. The unit also offers full stand-alone functionality, allowing you to configure settings, save up to six presets and operate entirely without a computer—ideal for mobile setups or field recording.

Direct USB Recording and Live Playback

DURec lets you record and play back directly from USB storage devices, transforming the UCX II into a standalone multitrack recorder or virtual soundcheck tool. Capture full shows, rehearsals or sessions on the fly, then route any combination of channels for playback—even with no computer attached. The rear USB port also supports connection to RME’s ARC USB remote controller for hands-on operation.

TotalMix FX and Remote Software Control

With RME’s TotalMix FX DSP mixer, you get unlimited submixes, advanced routing, and onboard EQ, dynamics, reverb and delay—latency-free on every output. TotalMix Remote extends control across Mac, PC or iPad, letting you adjust your entire mix wirelessly via Wi-Fi or Ethernet. DIGICheck analysis tools are also included for precision metering and signal diagnostics.

Class Compliant Mode for Universal Compatibility

The Fireface UCX II supports both USB 2.0 and Class Compliant operation. In CC mode, it works plug-and-play with macOS, Windows and Linux—no driver installation needed. It’s perfect for fast integration with tablets or modern OS platforms while still offering high-performance routing and mixing through TotalMix FX when using the full RME driver suite.

Included Software Bundle for Production and Performance

The Fireface UCX II includes a powerful software bundle to get you creating right away:
• Ozone 10 Elements – Full license, all-in-one mastering tool
• True Sound Drum Pack Sampler – Premium drum sound collection (ZIP file)
• S Gear Amp Simulation Software – Full license, amp simulation plugin for guitar
• Brainworx BX Opto Compressor – Full license, optical compressor plugin
• Brainworx BX Master Desk – Full license, mastering software plugin
• Gig Performer – Trial version, live performance plugin for set lists, backing tracks and more
• Modartt Pianoteq 6 – Trial version, virtual piano instrument
• GG Audio Blue 3 – Trial version, virtual organ plugin
• Tape It – Full license, record and share music from your iOS device
• Auto-Tune – 3-month trial, industry-standard pitch correction plugin

As with every RME interface, the Fireface UCX II is engineered in Germany for long-term reliability, ultra-low latency and consistent professional performance. It’s the go-to interface for pros who demand stability and flexibility in every session.
RME Fireface UCX II USB Audio Interface
RME Fireface UCX II USB Audio Interface
RME Fireface UCX II USB Audio Interface

collapse expand iconSpecs

Analog
  • AD, Line In 5-8, rear
  • Resolution AD: 24 bit
  • Signal to Noise ratio (SNR): 112dB RMS unweighted, 115 dBA
  • Frequency response @ 44.1kHz, -0.1dB: 5Hz–20.8kHz
  • Frequency response @ 96kHz, -0.5dB: 3Hz–45.8kHz
  • Frequency response @ 192kHz, -1dB: 2Hz–92kHz
  • THD: < -110dB, < 0.00032 
  • THD+N: < -104dB, < 0.00063 %
  • Channel separation: > 110dB
  • Input: 6.3 mm TRS jack, electronically balanced
  • Input impedance: 8 kOhm unbalanced, 12 kOhm balanced
  • Input sensitivity switchable to +19dBu and +13dBu
  • Variable gain: 0 to +12dB
  • Minimum level for 0 dBFS: +1 dBu, -1.2 dBV
Line In 3-4, front
  • As AD, but:
  • Additional Gain stage: 0 up to +12dB
  • Maximum input level, +19 dBu, Gain 0dB: Line +19 dBu, Inst +13 dBu
  • Maximum input level, +13 dBu, Gain 12dB: Line +1 dBu, Inst -5 dBu
  • Input impedance: Instrument 1 mOhm. Line 13 kOhm balanced, 9 kOhm unbalanced
  • Input Gain Inst: +6dB
  • Input mode: Line balanced (TRS), Inst unbalanced (TS)
Microphone In 1-2, front
  • As AD, but:
  • Input: XLR, electronically balanced
  • Input impedance: 5.4 kOhm
  • Gain range: 75dB
  • Maximum input level, Gain 0dB: +18 dBu
  • Maximum input level, Gain 75dB: -57 dBu
  • EIN: -128 dBu A-weighted, 60dB gain,150 Ohm, 20Hz–20kHz
Line In 1-2
  • As AD, but:
  • Input: TRS, electronically balanced
  • Input impedance: 10 kOhm balanced, 5 kOhm unbalanced
  • Maximum input level, Gain 0dB: +24 dBu
  • Maximum input level, Gain 75dB: -51 dBu
DA, Line Out 1-6, rear
  • Resolution: 24-bit
  • Dynamic range (DR): 112dB RMS unweighted, 115 dBA
  • Frequency response @ 44.1kHz, -0.5dB: 5Hz–20.8kHz
  • Frequency response @ 96kHz, -0.5dB: 5Hz–45kHz
  • Frequency response @ 192kHz, -1dB: 5Hz–89kHz
  • THD: < -108dB, < 0.0004 %
  • THD+N: < -104dB, < 0.00063 %
  • Channel separation: > 110dB
  • Maximum output level: +19dBu
  • Output: 6.3 mm TRS jack, servo-balanced
  • Output impedance: 75 Ohm
  • Output level switchable +19 dBu, +13 dBu, +4 dBu
DA - Stereo Monitor Output Phones (7-8)
  • As DA, but:
  • Output: 6.3 mm TRS stereo jack, unbalanced
  • Maximum output level at 0 dBFS, High: +19 dBu
  • Maximum output level at 0 dBFS, Low: +4 dBu
  • Output impedance: 1 Ohm
  • Max power per channel @ 32 Ohm load, 0.1% THD: 210 mW (2.6 Vrms, +10.5 dBu)
MIDI
  • 1 x MIDI I/O via 5-pin DIN jacks
  • Galvanically isolated by optocoupled input
  • Hi-speed mode: Jitter and response time typically below 1 ms
  • Separate 128-byte FIFOs for input and output
Digital
  • Clocks: Internal, ADAT, AES, SPDIF, word clock
  • Jitter suppression of external clocks: > 50dB (2.4kHz)
  • Effective clock jitter influence on AD and DA conversion: near zero
  • PLL ensures zero dropout, even at more than 100 ns jitter
  • Digital Bitclock PLL for trouble-free varispeed ADAT operation
  • Supported sample rates: 28kHz up to 200kHz
Digital Inputs
  • AES/EBU
  • 1 x XLR, transformer-balanced, galvanically isolated, according to AES3-1992
  • High-sensitivity input stage (< 0.3 Vpp)
  • SPDIF compatible (IEC 60958)
  • Accepts Consumer and Professional format
  • Lock range: 27kHz–200kHz
  • Jitter suppression: > 50dB (2.4kHz)
SPDIF coaxial
  • 1 x RCA, according to IEC 60958
  • High-sensitivity input stage (< 0.3 Vpp)
  • Accepts Consumer and Professional format, copy protection will be ignored
  • Lock Range: 27kHz–200kHz
  • Jitter suppression: > 50dB (2.4kHz)
ADAT Optical
  • 1 x TOSLINK, format according to Alesis specification
  • Standard: 8 channels 24-bit, up to 48kHz
  • Double Speed (S/MUX): 4 channels 24-bit 96kHz
  • Quad Speed (S/MUX4): 2 channels 24-bit 192kHz
  • Bitclock PLL ensures perfect synchronisation even in varispeed operation
  • Lock range: 31.5kHz–50kHz
  • Jitter suppression: > 50dB (2.4kHz)
  • SPDIF compatible (automatic detection)
Word Clock
  • BNC
  • Internal termination: 75 Ohm switchable
  • Automatic Double/Quad Speed detection and internal conversion to Single Speed
  • SteadyClock guarantees super low jitter synchronization even in varispeed operation
  • Not affected by DC-offsets within the network
  • Signal Adaptation Circuit: signal refresh through auto-center and hysteresis
Overvoltage protection
  • Level range: 1.0 Vpp – 5.6 Vpp
  • Lock Range: 27kHz–200kHz
  • Jitter suppression: > 50dB (2.4kHz)
Digital Outputs
  • AES/EBU
  • XLR, transformer-balanced, galvanically isolated, according to AES3-1992
  • Output level: Professional 4.5 Vpp, Consumer 2.6 Vpp
  • Format Professional according to AES3-1992 Amendment 4
  • Format Consumer (SPDIF) according to IEC 60958
  • Single Wire mode, sample rate 28kHz up to 200kHz
SPDIF coaxial
  • 1 x RCA, according to IEC 60958
  • Output level: Professional 1.2 Vpp, Consumer 0.6 Vpp
  • Format Professional according to AES3-1992 Amendment 4
  • Format Consumer (SPDIF) according to IEC 60958
  • Single Wire mode, sample rate 28kHz up to 200kHz
ADAT
  • 1 x TOSLINK, format according to Alesis specification
  • Standard: 8 channels 24-bit, up to 48kHz
  • Double Speed (S/MUX): 4 channels 24-bit/96kHz
  • Quad Speed (S/MUX4): 2 channels 24-bit/192kHz
Word Clock
  • BNC
  • Max. output voltage: 5 Vpp
  • Output voltage @ 75 ohm termination: 4.0 Vpp
  • Output impedance: 10 ohm
  • Frequency range: 27kHz–200kHz
General
  • Power supply: external power supply
  • Typical power consumption: 13W
  • Current at 12 Volt operating voltage: 910 mA (11W)
  • Dimensions incl. rack ears, full depth (WxHxD): 10.5" x 1.73" x 6.1", 265 x 44 x 155 mm
  • Dimensions without rack ears, body depth (WxHxD): 8.5" x 1.73" x 5.1", 215 x 44 x 130 mm
  • Weight: 910 g (2 lb)
  • Temperature range: +5° up to +50° Celsius (41°F up to 122°F)
  • Relative humidity: < 75%, non condensing

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