RME Fireface 400 Reviews

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Is The RME Fireface 400 The Right Audio Interface For You?
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RME Fireface 400 Description
The RME Fireface 400 is the only device in its class with active jitter suppression, standalone functionality, complete front-panel control, professional quality I/O, a 648-channel matrix router, and sample rates up to 192kHz.

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 mean unrivaled 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. 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 excels 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.

Analog I/O
Eight inputs and outputs (balanced, output 7/8 unbalanced) with software controlled switching of the reference levels (-10 dBV, +4 dBu, Lo/HiGain), of course realized discretely in the analog domain, guarantee highest dynamic range and highest fidelity.

The Fireface 400's front panel features 2 balanced microphone inputs with a digitally controlled input stage, individually switchable 48V phantom power, and Neutrik Combo connectors for XLR and TRS. These can also be used as additional line inputs. A pre amplification of up to 65 dB, adjustable in steps of 1 dB over a range of 55 dB, exceptional EIN performance even at low pre-amplification settings, and extremely low THD+N let these preamps surpass those of other devices that cost several times the price of the Fireface 400. All level settings are 100% reproducible and can also be adjusted by software comfortably.

Inputs 3 and 4 are extremely flexible balanced universal inputs. Firstly, they operate exactly as inputs 5 to 8 on the rear and can be adjusted to accept standard studio input levels (+4 dBu, LoGain). Furthermore, the input impedance can be switched from Line (10 kOhm) to Instrument (470 kOhm). An additional analog input amplification of up to 18 dB (in steps of 0.5 dB) is also available. In short: There's no signal that these inputs can't deal with perfectly!

Inputs 5 to 8 on the rear feature RME's proven level references. -10 dBV, +4 dBu und LoGain can be selected in the settings dialog, equivalent to +2 dBV, +13 dBu und +19 dBu for digital full scale. The same applies to the balanced rear analog outputs 1 to 6. The high power phones output offers high volumes even with low-impedance headphones, and represents playback channels 7/8. All outputs can be used for ASIO Direct Monitoring purposes.

Digital I/Os
An ADAT optical I/O allows for a connection and insertion of effects devices, mixing consoles or external converters. Of course, these 8 channels are available simultaneously with the analog channels. Using an additional ADI-8 DS or OctaMic D, you'll get 16 analog inputs and outputs, which remain still 12 at 96 kHz. The coaxial SPDIF I/O , which is fully AES/EBU compatible (as is common for RME), also works up to 192 kHz, which means that at the highest sample rate, 8 analog and two digital inputs and outputs are directly available. SPDIF can also be accessed through the optical I/O, which also works up to 192k - a world exclusive RME feature.

Special 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.