- Number of Channels: 40
- Number of Preamps: 4
- Sample Rate: 192 kHz
- Bit Depth: 24 bit
- Inputs: ADAT, AES/EBU, Jack 6,3 mm TRS, MIDI IN, USB, Word Clock, XLR-Jack
- Outputs: ADAT, AES/EBU, Headphone Jack 6,3mm TRS, Jack TRS 6,3mm, MIDI OUT, USB, Word Clock
RME Fireface UCX II USB Audio Interface
The RME Fireface UCX II combines 40 channels of I/O, 24-bit / 192 kHz conversion, and a full DSP mixer in a half-rack unit weighing just 910 g. Designed for both project studios and mobile recording rigs, this model integrates DURec standalone recording, DC-coupled CV/Gate outputs for modular synths, and class-compliant operation for iOS devices. SteadyClock FS femtosecond clocking and FPGA-based TotalMix FX make the interface a reference-grade hub for any DAW setup.
- 40 channels (20 in / 20 out) with simultaneous ADAT, AES/EBU, and S/PDIF
- 24-bit / 192 kHz conversion with 112 dB SNR and SteadyClock FS jitter rejection
- DURec records all 40 channels directly to USB storage up to 2 TB without a computer
- It includes DC-coupled line outputs that send CV/Gate signals to Eurorack modular synthesizers.
RME Fireface UCX II — 40-Channel USB Audio Interface
The RME Fireface UCX II is a 40-channel advanced USB audio interface packing studio-grade conversion, a full DSP mixer, and standalone recording into a half-rack enclosure. SteadyClock FS femtosecond clocking delivers reference-class jitter rejection across all digital formats. Offering 20 inputs and 20 outputs, this model provides high I/O density for project studios and mobile rigs.
DURec Standalone Recording and DC-Coupled CV/Gate Outputs
The integrated DURec recorder captures all 40 channels directly to USB storage without a computer. All line outputs are DC-coupled for sending control voltages and Gate signals to Eurorack modular synthesizers. TotalMix FX provides latency-free routing, EQ, dynamics, reverb, and delay on every channel.
Analog Performance — 24-bit / 192 kHz Conversion
Two front-panel digitally controlled microphone preamps offer 75 dB of gain in 1 dB steps, with two line/instrument inputs adding 24 dB for DI use.
- Bit Depth: 24 bit
- Sample Rate: 192 kHz
- Users get 4 preamps, consisting of two mic/line XLR combo preamps plus two line/instrument inputs.
- Phantom Power: Yes
- Signal-to-Noise Ratio: 112 dB RMS unweighted / 115 dBA
Digital I/O — ADAT, AES/EBU, S/PDIF, and Word Clock
AES/EBU, coaxial S/PDIF, and ADAT optical operate simultaneously, so the full 40-channel count is usable without trade-offs.
- ADAT: Yes — 1 x TOSLINK, 8 channels @ 48 kHz
- AES/EBU: Yes — transformer-balanced XLR
- S/PDIF: Yes — coaxial RCA
- MADI: No
- Word Clock: BNC I/O — switchable 75 Ohm termination
Workflow — TotalMix FX, DURec, and Class-Compliant Mode
TotalMix FX provides latency-free monitor mixes and effects on every channel. Class-compliant mode enables plug-and-play with iOS, macOS, and Linux.
- Inputs: XLR-Jack, 6.3 mm TRS, MIDI IN, ADAT, Word Clock, USB, AES/EBU
- TotalMix FX: Onboard DSP mixer
- DURec Recording: Up to 2 TB USB storage
- Class Compliant Mode: Yes
- Dimensions: 258 x 44 x 155 mm
- Weight: 910 g
Number of Channels: 40
This product offers 40 channels, allowing you to efficiently connect and manage multiple audio sources simultaneously. Each channel operates independently, giving you full control over each input, greatly expanding your ability to create and edit sound.
Number of Preamps: 4
This product features four preamplifiers that provide professional audio processing for four separate channels. This configuration allows multiple instruments or microphones to be connected and processed simultaneously, while maintaining clean, dynamic sound with low noise.
Phantom Power: Yes
Phantom power provides the necessary voltage for condenser microphones that require an external power source to operate properly. This power supply is built directly into the microphone input, eliminating the need for additional power supplies.
Sample Rate: 192 kHz
A sample rate of 192 kHz enables extremely detailed, high-resolution audio capture and playback. This frequency allows sound to be recorded and processed with extreme precision, making it ideal for professional recording, mastering, or sound design projects where every nuance and detail is important.
Bit Depth: 24 bit
The 24-bit depth provides significantly more dynamic range and detail than standard 16-bit recording. With 24-bit depth, you can capture finer details and wider dynamic range, perfect for professional recording, mastering, and applications where accuracy and sound quality are critical.
S/PDIF: Yes
S/PDIF is a digital interface used to transfer high-quality audio between devices such as CD players, audio interfaces, amplifiers, and home theaters. It transfers audio signals in digital form without any loss of quality. S/PDIF ensures clean and accurate signal transmission without the need for conversion to analog form, minimizing noise and interference, making it ideal for professional and home audio systems.
ADAT: Yes
ADAT is a digital transmission protocol that allows the transmission of up to 8 channels of digital audio over a single optical cable (Toslink). It is often used in studio applications to increase the number of audio channels between devices such as audio interfaces and digital mixers. ADAT allows for high-quality audio transmission while providing more channels at lower sample rates. This format is ideal for situations where it is necessary to transmit multiple channels of digital audio without loss of quality.
AES/EBU: Yes
AES/EBU is a professional digital audio transmission standard for transmitting two channels of digital audio over balanced XLR cables. It is a high-quality interface that is widely used in studio and professional audio applications. AES/EBU transmits the signal in a format similar to S/PDIF, but with greater reliability and robustness for professional environments, ensuring clean signal transmission over long distances. This format is ideal for situations where stability and digital sound quality are important.
Inputs
- AES/EBU
- USB
- Jack 6,3 mm TRS
- XLR-Jack
- ADAT
- Word Clock
- MIDI IN
Outputs
- Jack TRS 6,3mm
- MIDI OUT
- USB
- Headphone Jack 6,3mm TRS
- ADAT
- Word Clock
- AES/EBU
Headphone Output: Yes
The headphone output allows direct connection of headphones for private listening. This output provides a convenient way to enjoy the sound without disturbing others or ambient noise.
Package Contents
- Optical Cable
- XLR to 3,5 mm jack Cable
- B0968 Digital breakout cable
- Adapter
- USB Cable
DA Conversion: Yes
DA conversion allows digital signals to be converted to analog signals with high accuracy. This process ensures that digital audio is reproduced with minimal distortion, preserving all the fine details and dynamics of the original sound. Thanks to high-quality DA conversion, the sound is clear, rich, and true to the original when played through speakers or headphones.
AD Conversion: Yes
High-quality AD conversion ensures that every detail and dynamic range of analog audio is preserved when converted to digital form, ideal for professional recording and production. This allows analog sound sources such as microphones and instruments to be accurately recorded in digital systems.
Compatibility
Number of Channels
Number of Preamps
Phantom Power
Word Clock
ADAT
MIDI Interface
DA Conversion
AD Conversion
Sample Rate
Bit Depth
24 bit
USB version
2.0
AES/EBU
MADI
Rackmountable
S/PDIF
Ethernet
Inputs
ADAT, AES/EBU, Jack 6,3 mm TRS (8 x), MIDI IN, USB, Word Clock (8 x), XLR-Jack (2 x)
Outputs
Jack TRS 6,3mm (6 x), Headphone Jack 6,3mm TRS, MIDI OUT, Word Clock, ADAT, USB, AES/EBU
Headphone Output
Optical Out
Yes
Package Contents
USB Cable, Optical Cable, XLR to 3,5 mm jack Cable, B0968 Digital breakout cable, Adapter
UK/EU Power supply included
Yes
Length (cm)
13
Width (cm)
21.5
Height (cm)
4.4
Weight
910 g
Documents
Instructions for use
Manufacturer information
Safety instructions
Please refer to the user manual for the specific safety instructions for this product.
