27. Analog Inputs

27.1 Line Rear

The Fireface has eight balanced Line inputs as 1/4" TRS jacks on the back of the unit. The elec- tronic input stage is built in a servo balanced design which handles unbalanced (mono jacks) and balanced (stereo jacks) correctly, automatically adjusting the level reference.

When using unbalanced cables with TRS jacks: be sure to connect the 'ring' contact of the TRS jack to ground. Otherwise noise may occur, caused by the unconnected negative input of the balanced input.

One of the main issues when working with an AD-converter is to maintain the full dynamic range within the best operating level. Therefore the Fireface 800 internally uses hi-quality elec- tronic switches, which allow for a perfect adaptation of all rear inputs to the three most often used studio levels.

The 'standardized' studio levels do not result in a (often desired) full scale level, but take some additional digital headroom into consideration. The amount of headroom is different in different standards, and again differently implemented by different manufacturers. Because of this we decided to define the levels of the Fireface in the most compatible way.

Reference

0 dBFS @

Headroom

Lo Gain

+19 dBu

15 dB

+4 dBu

+13 dBu

9 dB

-10 dBV

+2 dBV

12 dB

With +4 dBu selected, the according headroom meets the latest EBU recommendations for Broadcast usage. At -10 dBV a headroom of 12 dB is common practice, each mixing desk op- erating at -10 dBV is able to send and receive much higher levels. Lo Gain is best suited for professional users who prefer to work balanced and at highest levels. Lo Gain provides 15 dB headroom at +4 dBu nominal level.

The above levels are also found in our ADI-8 series of AD/DA converters, the Multiface, and even in our Mic-Preamps QuadMic and OctaMic. Therefore all RME devices are fully compati- ble to each other.

27.2 Microphone / Line Front

The balanced microphone inputs of the Fireface 800 offer an adjustable gain of 10 to 60 dB. The soft switching, hi-current Phantom power (48 Volt) provides a professional handling of con- densor mics. The mic preamp's discreet Class-A front end guarantees a superior sound quality.

With the balanced Line input, which can be used alternatively or at the same time as the micro- phone, the Fireface 800 becomes even more flexible. 10 kOhm input impedance, stereo TRS jack and adjustable input sensitivity in a range of 50 dB – this all guarantees that the front-side Line inputs can be used perfectly with keyboards, sampler, active guitars and much more.

The Line inputs handle levels from –28 dBu up to +22 dBu. Two LEDs display a present signal (from –45 dBFS on) and warn against overload (-2 dBFS).

Channels 7/8 can be switched between Line rear, microphone, and Line/microphone simultane- ously in the Settings dialog. The front Line input can be used simultaneously with the micro- phone input. This way, up to three different sound sources (Line rear, Line front, microphone) may be recorded at the same time on one channel.

User's Guide Fireface 800 © RME

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Intel Fireface 800 manual Analog Inputs, Line Rear, Microphone / Line Front, Reference DBFS @ Headroom
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Fireface 800 specifications

The Intel Fireface 800 is a powerful audio interface celebrated for its high-performance capabilities and versatility in both studio and live settings. Designed to cater to the needs of musicians, producers, and sound engineers, it stands out with its rich feature set and reliable technology.

One of the defining features of the Fireface 800 is its support for an impressive 26 input and 28 output channels. This extensive I/O configuration facilitates seamless integration with a wide variety of audio production setups, allowing users to record multiple instruments simultaneously or create complex routing scenarios. The unit also boasts top-notch analog and digital converters, ensuring pristine sound quality with a dynamic range that captures the nuances of any audio source.

In terms of connectivity, the Fireface 800 is equipped with both FireWire and USB ports, making it compatible with a range of computers and devices. The device utilizes the FireWire 800 protocol, which delivers higher data transfer rates compared to its predecessor. This efficient transfer capability is crucial for maintaining audio fidelity and reducing latency, making it an ideal choice for real-time monitoring and recording.

The Fireface 800 also features standalone operation capabilities, functioning independently of a computer when needed. This is particularly useful for live performances, where reliability and reduced setup complexity are essential. Users can easily connect microphones, instruments, and other equipment directly to the Fireface 800, making it a versatile tool for a variety of scenarios.

With its low-latency driver technology, the Fireface 800 ensures smooth performance even when handling demanding audio tasks. Its advanced ADAT and S/PDIF digital inputs and outputs provide further flexibility for connecting other gear, such as additional preamps and effects processors.

Another noteworthy characteristic of the Fireface 800 is its robust build quality. Designed for regular use in professional environments, the unit features a rugged metal chassis that can withstand the rigors of transport and daily use. This ensures longevity and consistent performance for audio professionals who depend on reliable equipment day in and day out.

In summary, the Intel Fireface 800 is a versatile and powerful audio interface that caters to a wide spectrum of audio production needs. With its extensive I/O capabilities, high-quality converters, reliable connectivity options, and robust design, it continues to be a popular choice among audio professionals striving for excellence in their work.
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