Detail 01
40 channels of analog and digital I/O
The USB interface combines mic/line connections with ADAT, AES/EBU, SPDIF, MIDI, and word clock.
Product detailSKU #1500000359384
RMEFireface UCX II USB Audio Interface
1/6
Independent shopping perspective
The Korena take
RME's Fireface UCX II places 40 channels of analog and digital I/O in a half-rack USB 2.0 interface for compact studio and mobile rigs. Front-panel access covers two mic/line combo preamps and two instrument-ready line inputs, while the wider connection set includes ADAT, AES/EBU, SPDIF, MIDI, and word clock. It can run without a computer, save six presets, and use DURec to record or play back from USB storage. TotalMix FX adds routing, unlimited submixes, and onboard processing across every output.
Strong match
Who this is for
- Compact studio or mobile rigs needing analog and digital connections in a half-rack interface.
- Recording rehearsals, shows, or sessions directly to USB storage without a computer.
- Creating separate output mixes with TotalMix FX routing and onboard effects processing.
What matters in use
The specifications, translated
Catalog numbers tell only part of the story. These are the details most likely to change how this product feels, sounds, or fits into a setup.
Detail 02
DC-coupled analog outputs
They can output control voltage for modular synths and creative routing.
Detail 03
Stand-alone operation
Settings can be configured and up to six presets saved without a computer.
Detail 04
DURec
It records to and plays back from USB storage devices for standalone multitrack recording or virtual soundcheck use.
Detail 05
Class Compliant mode
It works plug-and-play with macOS, Windows, and Linux without driver installation.
Detail 06
Dimensions without rack ears
The body measures 8.5 x 1.73 x 5.1 inches (215 x 44 x 130 mm).
Final check
Know before you order
- 01Computer-free recording and playback use a USB storage device.
- 02The rear USB port supports RME's ARC USB remote controller.
- 03Full TotalMix FX routing and mixing uses the RME driver suite; Class Compliant mode needs no driver installation.
Product questions
Before you decide
Straight answers to the questions shoppers most often ask about this product.
01Can the UCX II record without a computer?
Yes. DURec records directly to USB storage devices, and the interface can also operate standalone.
02How many microphone preamps are on the front panel?
It has two mic/line combo preamps, plus two instrument-ready line inputs.
03Does it work without drivers?
In Class Compliant mode, it works plug-and-play with macOS, Windows, and Linux without driver installation.
04Can it control modular synths?
Yes. Its analog outputs are DC-coupled for control-voltage output to modular synths.
Reference
Full specifications
The complete catalog record, organized around the decisions musicians make when comparing gear.
6 detailsSound
- Frequency Response 96khz 0 5db
- 5Hz–45kHz
- Frequency Response 44 1khz 0 5db
- 5Hz–20.8kHz
- Frequency Response 44 1khz 0 1db
- 5Hz–20.8kHz
- Frequency Range
- 27kHz–200kHz
- Effective Clock Jitter Influence On Ad and Da Conversion
- near zero
- Frequency Response 192khz 1db
- 5Hz–89kHz
1 detailsPickups & controls
- Signal Adaptation Circuit
- signal refresh through auto-center and hysteresis
21 detailsConnections & power
- Output
- 6.3 mm TRS stereo jack, unbalanced
- Supported Sample Rates
- 28kHz up to 200kHz
- Current At 12 Volt Operating Voltage
- 910 mA (11W)
- Output Voltage 75 Ohm Termination
- 4.0 Vpp
- Maximum Output Level
- +19dBu
- Input
- TRS, electronically balanced
- Maximum Output Level At 0 Dbfs Low
- +4 dBu
- Maximum Input Level 19 Dbu Gain 0db
- Line +19 dBu, Inst +13 dBu
- Input Gain Inst
- +6dB
- Maximum Input Level 13 Dbu Gain 12db
- Line +1 dBu, Inst -5 dBu
- Maximum Input Level Gain 75db
- -51 dBu
- Input Mode
- Line balanced (TRS), Inst unbalanced (TS)
- Maximum Output Level At 0 Dbfs High
- +19 dBu
- Typical Power Consumption
- 13W
- Input Impedance
- 10 kOhm balanced, 5 kOhm unbalanced
- Maximum Input Level Gain 0db
- +24 dBu
- Output Impedance
- 10 ohm
- Max Output Voltage
- 5 Vpp
- Power Supply
- external power supply
- Output Level
- Professional 1.2 Vpp, Consumer 0.6 Vpp
- Max Power per Channel 32 Ohm Load 0 1 Thd
- 210 mW (2.6 Vrms, +10.5 dBu)
3 detailsSize & weight
- Weight
- 910
- Dimensions Without Rack Ears Body Depth Wxhxd
- 8.5 inch x 1.73 inch x 5.1 inch, 215 x 44 x 130 mm
- Dimensions Incl Rack Ears Full Depth Wxhxd
- 10.5 inch x 1.73 inch x 6.1 inch, 265 x 44 x 155 mm
1 detailsIn the box
- Standard
- 8 channels 24-bit, up to 48kHz
23 detailsOther
- Resolution Ad
- 24 bit
- Resolution
- 24-bit
- Channel Separation
- > 110dB
- Temperature Range
- +5° up to +50° Celsius (41°F up to 122°F)
- Dynamic Range Dr
- 112dB RMS unweighted, 115 dBA
- Double Speed S Mux
- 4 channels 24-bit/96kHz
- Gain Range
- 75dB
- Minimum Level For 0 Dbfs
- +1 dBu, -1.2 dBV
- Lock Range
- 27kHz–200kHz
- Clocks
- Internal, ADAT, AES, SPDIF, word clock
- Signal to Noise Ratio Snr
- 112dB RMS unweighted, 115 dBA
- Hi Speed Mode
- Jitter and response time typically below 1 ms
- Relative Humidity
- < 75%, non condensing
- Level Range
- 1.0 Vpp – 5.6 Vpp
- Ein
- -128 dBu A-weighted, 60dB gain,150 Ohm, 20Hz–20kHz
- Thd N
- < -104dB, < 0.00063 %
- Variable Gain
- 0 to +12dB
- Quad Speed S Mux4
- 2 channels 24-bit/192kHz
- Internal Termination
- 75 Ohm switchable
- Jitter Suppression of External Clocks
- > 50dB (2.4kHz)
- Jitter Suppression
- > 50dB (2.4kHz)
- Thd
- < -108dB, < 0.0004 %
- Additional Gain Stage
- 0 up to +12dB
