RME's Fireface 800 revolutionized the world of FireWire audio interfaces. Now the revolution continues: The Fireface 400 is not just the little brother of the Fireface 800 - it is a completely newly designed device. It is the only device in its class with active jitter suppression, stand-alone functionality, complete controllability from the front panel, highly flexible I/Os in professional quality, and an unsurpassed 648-channel matrix router - at sample rates up to 192 kHz. The DSP-based TotalMix mixer allows fully independent routing and mixing of all 18 input and output channels to all 18 physical outputs. Up to 9 totally independent stereo sub-mixes simply mean unrivalled monitoring facilities. Copy/paste of routings, ganging and group-based operation of faders, and the extraordinary Matrix window are just some of the mixer's unique features. The mixer can be completely MIDI controlled, even in stand-alone operation. Furthermore the DSP hardware calculates RMS and Peak levels for all 54 audio channels, without causing any significant CPU load.
A word clock input and output (BNC) plus two MIDI I/Os (breakout cable, 5-pin DIN) complete the analog/digital feature list and turn the Fireface 400 into an entire audio system of the highest quality.
The Fireface 400 excells as portable all-in-one solution when it comes to power supply. The included switching power supply accepts voltages from 100 to 240 V, thus can be operated all over the world. A rear panel switch enables Bus Powered operation, taking the power directly from the FireWire connector. To avoid potential problems, both the unit's internal power supply and the protective circuits at the FireWire port were specially designed and thoroughly tested.

Features:
Thanks to an internal flash memory, all settings including TotalMix are recalled during boot. The device can thus be configured and used as a stand-alone device, without being connected to a computer, e.g. as a submixer, A/D and D/A-converter, headphone mixer, format converter, instrument or microphone pre-amplifier, monitoring mixer and much more.
The Fireface 400 is equipped with SteadyClock™, RME's unique sync and clock technology. With this, the device becomes a sync reference for the whole studio. SteadyClock refreshes clock signals, removes jitter, and takes permanent care of optimal conversion quality, thus guarantees a sensational sound quality, completely independent from the reference clock's quality.
SteadyClock allows the unit to control the sample rate freely on its own. The Settings dialog includes a direct choice of the video and audio world's most often used sample rates. Additionally, two faders can be used to set the sample rate freely and in real-time, within the range of +/- 4% and +/- 0.4%.
Fireface 400 uses RME's own FireWire techology, heavily optimized for audio purposes (RME is the only manufacturer not to use a third party FireWire audio technology). Minimum overhead, special hardware adaptations, and a new low-latency buffer concept allow a performance and compatibility considered impossible for FireWire audio until now. This includes changing latency in mid-operation, latencies down to one ms, or an immediate reaction to changes of the sample rate. Further optimizations and additional features can be added at any time by Flash Updates.
Of course the Fireface 400 offers a second FireWire port for hub functionality. Several devices can be connected to one FireWire interface and operated in parallel. The renowned Fireface 800 shares the same driver, allowing mixed setups.

Specifications:
Input AD: 6 x 1/4" TRS (4 x LIne, 2 x Line/Instrument), 2 x XLR/TRS Combo connector (2 x Mic/Line) all servo-balanced.
Output DA: 6 x 1/4" TRS, servo-balanced, DC-coupled signal path. 1 x 1/4" TRS unbalanced
Input Digital: 1 x ADAT optical or SPDIF optical, SPDIF coaxial (AES/EBU compatible)
Output Digital: 1 x ADAT optical or SPDIF optical, SPDIF coaxial (AES/EBU compatible)
MIDI: 2 x MIDI I/O via breakoutcable (4 x 5-pin DIN jacks), for 32 channels low jitter hi-speed MIDI
Dynamic range AD: 109 dB RMS unweighted, 112 dBA
THD AD: < -100 dB (< 0.001 %)
THD+N AD: < -98 dB (< 0.0012 %)
Crosstalk AD: > 100 dB
Dynamic range DA: 110 dB RMS unweighted, 112 dBA (unmuted)
THD DA: < -100 dB (< 0.001 %)
THD+N DA: < -97 dB (< 0.0014 %)
Crosstalk DA: > 100 dB
Input/Output level for 0 dBFS @ Hi Gain: +19 dBu
Input/Output level for 0 dBFS @ +4 dBu: +13 dBu
Input/Output level for 0 dBFS @ -10 dBV: +2 dBV
Sample rate internally: 32, 44.1, 48, 64, 88.2 kHz, 96 kHz, 128, 176.4, 192 kHz
Sample rate externally: 28 kHz - 200 kHz
Frequency response AD/DA, -0.5 dB: 5 Hz - 21 kHz (sf 44.1 kHz)
Frequency response AD/DA, -0.5 dB: < 5 Hz - 43.3 kHz (sf 96 kHz)
Frequency response AD/DA, -1 dB: < 5 Hz - 70 kHz (sf 192 kHz)

Driver support
Windows 2000 SP4, Windows XP/XP64: Full ASIO multi-client operation of WDM, MME (not XP64), GSIF 2.0 and ASIO 2.0. WDM (DirectSound) with stereo and multi-channel support. Full hot-plugging. Up to 3 units operational.
Mac OS X (10.3. or up) and x86: Core Audio, Core MIDI. Since 10.4 (Tiger) up to 3 units operational.