40-Channel Advanced USB Audio Interface
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Fireface UCX II
RME Audio
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Now included with every RME Interface



True Sound Studio RME Drum Sample Pack


The True Sound Drum Sample pack has been recorded by Ryan Wiesner of True Sound Studios using the RME BabyFace Pro.  This unique pack only available with the Premium Plug in Bundle was recorded at indoor and outdoor locations such as reverb lush grain silos, waterfront, garage, and studio rooms. The Samples include Kick, Snare, Toms, Rims and Hi Hats along with Percussion to make your recordings truly unique and with premium sound quality.




How to Get the RME Drum Sample Pack


When customers register their RME interface they will be sent to the Plugins Bundle Page to receive instructions for the Sample Pack along with all of the FREE 3rd Party PLUGINS.

The Fireface UCX II is a highly integrated pro audio solution in an ultra-compact format for studio and live recordings. It continues RME's long tradition of designing compact advanced interfaces, packing into a half-rack size unit what usually would be spread out over two or three 19 inch panels.

Connectivity and Features

8 x Analog I/O

2 x XLR/TRS Mic/Inst/Line

2 x Line/Inst Input

1 x Phones Output

1 x AES I/O

1 x ADAT I/O

1 x SPDIF I/O Coax

1 x Word Clock I/O

1 x MIDI I/O

Class Compliant Mode

TotalMix FX



DC-coupled Outputs

SteadyClock FS


AutoSet Digital Gain Control


The most powerful & portable RME Audio USB Interface

This unique audio system is capable of transferring analog and digital audio data directly to Windows and Mac computers. The latest Plug and Play technology guarantees a simple installation, even for the inexperienced user. Numerous unique features like a well thought-out Settings dialog and an integrated routing solution realize a quick, comfortable and efficient operation of the Fireface UCX II.


The Fireface UCX II houses two mic/line preamps in XLR combo configuration on the front panel, along with two digitally controlled line/instrument inputs, followed by a headphone jack, various control buttons, a display, and the main volume knob. At the rear is a set of ten analogue balanced line inputs and outputs, MIDI I/O, ADAT I/O, AES/EBU and SPDIF I/O, USB 2.0 as well as a switchable word clock I/O.


With the SteadyClock FS, the Fireface UCX II features the latest clock and jitter rejection technology from RME. Based on a femtosecond clock, SteadyClock FS reduces the intrinsic jitter when converting from and to analogue over all digital formats to a new all-time low.

Full Stand-alone Functionality

Control all device states directly from the front panel for convenient, direct access to all features. Four keys and the encoder, the high-resolution and clear color display, and a well thought-out menu structure enable the user to quickly change and configure the device’s settings. Additionally internal memory allows for the permanent storage of six different states of the unit. Therefore the Fireface UCX II is able to operate fully stand-alone, without any connected computer. In stand-alone operation it can transform into totally different devices by the simple click of a button. Furthermore TotalMix FX can also be controlled via MIDI.




40-Channels ready for your Mobile Recording Rig

DURec is an integrated digital recorder for all inputs and outputs directly to USB memory devices via the rear USB port. It allows to record on USB thumb drives or hard drives with up to 2 TB capacity. The recording functionality is provided by the internal DSP, and is therefore independent from a connected Windows or Mac computer. This USB port can alternatively be used for direct connection of RME’s optionalARC USB remote control.


The Direct USB Recording converts the Fireface UCX II into a stand-alone field recorder and a powerful multichannel live player for previous recordings, e. g. for virtual sound checks. Live concerts, band rehearsals or spontaneous jam sessions can be directly recorded and played back from the medium - even completely stand-alone without computer or software. All input and output channels can be individually chosen for recording and playback.

Powerful Applications for Mixing, Monitoring and Measurement included

The Fireface UCX II comes with the TotalMix FX DSP mixer offering comprehensive routing and monitoring options, as well as the DIGICheck Analyzer allowing to measure and analyze the digital data feed in both

directions with maximum precision. TotalMix FX can completely replace an external mixer, enabling the creation of multiple latency-free monitor mixes with EQ, Dynamics, Reverb and Delay for any outputs, incl. main monitors and headphone mixes for musicians.


The additional TotalMix Remote is a remote control for TotalMix FX, to control the hardware mixer and effects in RME audio interfaces. TotalMix Remote mirrors the current state of the host system on the iPad and Windows/Mac computers - the entire mixing state, the complete routing, all FX settings, up to the level meters, and everything in real-time. Easily adjust all the mixer and FX settings from a distance, via Ethernet and WiFi.

DC-Coupled Outputs - CV/Gate Voltage Control

Most audio interfaces are traditionally designed with what is called 'AC-coupled outputs', where capacitors are used to filter out any extreme low frequencies.


Whilst these frequencies are generally considered undesirable for audio - eating into headroom and potentially causing damage to other equipment - one instance where DC-coupling remains desirable is the world of modular synthesizers, where static or slow-moving signals are used for control over various parameters such as pitch note values or LFOs.


All of the Fireface UCX II’s line-level outputs are fully DC-coupled, allowing for the sending of control voltages (CV) or Gate information to modular synthesizers (such as the popular Eurorack and Moog/MOTM/Synthesizers formats) and other studio hardware.

Class Compliant Audio

The Fireface UCX II operates in two different modes: driver-based USB2 and Class Compliant. The Class Compliant mode is a standard that is natively supported by operating systems like Windows, Mac OSX and Linux distributions. No proprietary drivers are required, the device will be directly recognized when the CC firmware is loaded. The natively available features will be limited in comparison to those provided by the RME driver for the UCX II.

Shipping September 2021

Fireface UCX II


AD, Line In 5-8, rear


Resolution AD: 24 bit

Signal to Noise ratio (SNR): 112 dB RMS unweighted, 115 dBA

Frequency response @ 44.1 kHz, -0.1 dB: 5 Hz 20.8 kHz

Frequency response @ 96 kHz, -0.5 dB: 3 Hz 45.8 kHz

Frequency response @ 192 kHz, -1 dB: 2 Hz 92 kHz

THD: < -110 dB, < 0.00032 %

THD+N: < -104 dB, < 0.00063 %

Channel separation: > 110 dB

Input: 6.3 mm TRS jack, electronically balanced

Input impedance: 8 kOhm unbalanced, 12 kOhm balanced

Input sensitivity switchable to +19 dBu and +13 dBu

Variable gain: 0 to +12 dB

Minimum level for 0 dBFS: +1 dBu, -1.2 dBV

Line In 3-4, front


As AD, but:


Additional Gain stage: 0 up to +12 dB

Maximum input level, +19 dBu, Gain 0 dB: Line +19 dBu, Inst+13 dBu

Maximum input level, +13 dBu, Gain 12 dB: Line +1 dBu, Inst-5 dBu

Input impedance: Instrument 1 MOhm. Line 13 kOhm balanced, 9kOhm unbalanced

Input Gain Inst: +6 dB

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: 75 dB

Maximum input level, Gain 0 dB: +18 dBu

Maximum input level, Gain 75 dB: -57 dBu

EIN: -128 dBu A-weighted, 60 dB gain,150 Ohm, 20 Hz 20 kHz

Line In 1-2


As AD, but:


Input: TRS, electronically balanced

Input impedance: 10 kOhm balanced, 5 kOhm unbalanced

Maximum input level, Gain 0 dB: +24 dBu

Maximum input level, Gain 75 dB: -51 dBu

DA, Line Out 1-6, rear


Resolution: 24 bit

Dynamic range (DR): 112 dB RMS unweighted, 115 dBA

Frequency response @ 44.1 kHz, -0.5 dB: 5 Hz 20.8 kHz

Frequency response @ 96 kHz, -0.5 dB: 5 Hz 45 kHz

Frequency response @ 192 kHz, -1 dB: 5 Hz - 89 kHz

THD: < -108 dB, < 0.0004 %

THD+N: < -104 dB, < 0.00063 %

Channel separation: > 110 dB

Maximum output level: +19 dBu

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 (2.6Vrms, +10.5 dBu)


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


Clocks: Internal, ADAT, AES, SPDIF, word clock

Jitter suppression of external clocks: > 50 dB (2.4 kHz)

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: 28 kHz up to 200 kHz

Digital Inputs



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: 27 kHz 200 kHz

Jitter suppression: > 50 dB (2.4 kHz)

SPDIF coaxial


1 x RCA, according to IEC 60958

High-sensitivity input stage (< 0.3 Vpp)

Accepts Consumer and Professional format, copy protection willbe ignored

Lock Range: 27 kHz 200 kHz

Jitter suppression: > 50 dB (2.4 kHz)

ADAT Optical


1 x TOSLINK, format according to Alesis specification

Standard: 8 channels 24 bit, up to 48 kHz

Double Speed (S/MUX): 4 channels 24 bit 96 kHz

Quad Speed (S/MUX4): 2 channels 24 bit 192 kHz

Bitclock PLL ensures perfect synchronisation even invarispeed operation

Lock range: 31.5 kHz 50 kHz

Jitter suppression: > 50 dB (2.4 kHz)

SPDIF compatible (automatic detection)

Word Clock



Internal termination 75 Ohm switchable

Automatic Double/Quad Speed detection and internalconversion to Single Speed

SteadyClock guarantees super low jitter synchronization evenin varispeed operation

Not affected by DC-offsets within the network

Signal Adaptation Circuit: signal refresh throughauto-center and hysteresis

Overvoltage protection

Level range: 1.0 Vpp 5.6 Vpp

Lock Range: 27 kHz 200 kHz

Jitter suppression: > 50 dB (2.4 kHz)

Digital Outputs



XLR, transformer-balanced, galvanically isolated, accordingto 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 28 kHz up to 200 kHz

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 28 kHz up to 200 kHz



1 x TOSLINK, format according to Alesis specification

Standard: 8 channels 24 bit, up to 48 kHz

Double Speed (S/MUX): 4 channels 24 bit 96 kHz

Quad Speed (S/MUX4): 2 channels 24 bit 192 kHz

Word Clock



Max. output voltage: 5 Vpp

Output voltage @ 75 Ohm termination: 4.0 Vpp

Output impedance: 10 Ohm

Frequency range: 27 kHz 200 kHz


Power supply: external power supply

Typical power consumption: 13 Watts

Current at 12 Volt operating voltage: 910 mA (11 Watts)

Dimensions incl. rack ears, full depth (WxHxD): 265 x 44 x155 mm (10.5" x 1.73" x 6.1")

Dimensions without rack ears, body depth (WxHxD): 215 x 44 x130 mm (8.5" x 1.73" x 5.1")

Weight: 910 g ( 2.0 lbs)

Temperature range: +5 up to +50 Celsius (41 F up to122F)

Relative humidity: < 75%, non condensing

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