Nagra VI

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Six channel digital audio recorder

Digital Location Recorder

Features

- 6 channels (4 Mic + 2 Line)
- 24 bit, 96 kHz AD / DA
- User programmable Pre-recording buffer
- Post-production compatible (BWF files)(iXML compatible)
- Large colour display
- SMPTE / EBU Time Code
- USB 2.0 communication
- Internal 2.5” Hard drive disk and removable Compact Flash
- Lightweight and battery operated
- Built-in matrix and two M/S decoders
- Internal speaker

The NAGRA VI has been designed as the natural successor to the NAGRA-D / DII multi-track digital recorders. Based on a totally new design concept, the hardware of the NAGRA VI is software dependent and can be adapted simply through software. Available in a choice of three colours ("Slate" grey, "Midnight" blue and "Burgundy" red) allowing owners of two or more recorders easily identify a particular unit. The NAGRA VI is supplied with two plastic "handles" which serve to protect the front of the unit from accidental damage, but can also be used to carry the recorder. A carrying case and shoulder strap are also supplied for over-the-shoulder operation.
The NAGRA VI is delivered with a removable battery box containing a lithium-ion battery pack, a mains power supply and is equipped with a 120GB internal hard disk.

Audio inputs
It offers six independent analogue audio inputs. Inputs 1 - 4 are equipped with traditional NAGRA microphone pre-amplifiers for dynamic and phantom +48V microphones. These pre-amplifiers are a combination of those developed for the NAGRA V and NAGRA-D and are without doubt the best audio inputs NAGRA has ever designed. An audio limiter can be selected for each of these inputs and these can be ganged in pairs if desired. These totally new concept input circuits offer the best specifications ever produced by any NAGRA in terms of pure audio quality. The four "In-house" transformers offer fully floating inputs for the dynamic microphones, giving a greatly improved signal-to-noise ratio. The remaining two analogue inputs are LINE level inputs for connection to other equipment supplying a line level signal, such as radio receivers. When set to the LINE position all 6 analogue inputs will accept up to +24dB. The two input connections (channels 5 + 6) double up as 2 AES inputs (A and B) when selected to digital input mode.

Zipper noise suppression
The NAGRA VI does not use traditional logarithmic potentiometers for the audio levels as were traditionally used on previous Nagra models. Today digital “encoders” are preferable because they do not suffer from “crackling” noise problems, and can be programmed to fulfill a multitude of different operations depending on the software program controlling them. Equally, even the graduation of the sweep is software calculated and can be altered relatively easily, rather than being created by the precision winding of the internal coils during manufacturing.
However, such encoders normally suffer from a phenomena known as the “Zipper” noise. The NAGRA VI benefits from a complex development in a suppression system used on every level control of the recorder. The end-result is that the potentiometers can be moved instantaneously and no digital zipper effect can be heard.
The potentiometers on the Nagra VI behave in exactly the same manner as the traditional logarithmic potentiometers used in Nagra analogue recorders but with the advantage of the precision offered by digitally controlled encoder devices, and hence an increase the perfection of all recordings.


The left side panel clearly shows not only the analogue and digital audio input connections, but also the external 4 pole XLR DC input socket, allowing the NAGRA VI to be externally powered from an external DC power source such as a car battery. The 5-pin LEMO SMPTE/EBU time code In/Out can also be seen as well as the two HIROSE connectors used for powering external accessories such as radio receivers. These two connectors can supply up to 1 A at 12V.


The right side of the recorder is where the removable compact flash card is located. A LED next to the slot indicates when the card is accessed. The stereo analogue outputs, and the main AES out as well as the second headphone connector can be clearly seen. Additional AES outputs are located on the 15 pin Extension connector. The Start / Stop terminal is a fader start (contact closure) command as found on other NAGRA recorders. Two USB (host / device) connectors are also located on the right side next to the card slot.



Technical Specifications:

-
Recording
-Data storage medium 120 GB Internal hard disk
-Removable media Compact Flash type I / II (Hot Swappable)
-Disk format FAT 32
-Recording Method Linear digital PCM
-File type 16 / 24 bit Broadcast Wave File BWF (WAV) with iXML, AES 31 compatible
-A/D & D/A conversion 24 Bit Sigma Delta
-Tracks 6 individual
-Sampling Rate 44.1, 48 kHz, 88.2 and 96 kHz (with 0.1% pull up/down)
-Recording capacity 20 mins of 6 track 24 bit 48 kHz per GB of disk / memory
-Mono / polyphonic Selectable
-Pre-recording buffer Up to 10 seconds @ 96 kHz 24-bit on 6 tracks
-Display 3.5 inch colour LCD TFT
-Level meters On colour display AND by LED for microphone inputs

-Inputs
Digital inputs 2 x XLR AES-3 shared with analogue inputs 5+6
Analogue inputs 4 x symmetrical XLR Microphone (Dynamic, +48V Phantom) / line

Microphone input sensitivity 2.8 and 10 mV/Pa selectable
Limiters Selectable on microphone inputs, individual or in pairs. Active at -7.6dBFS, max +40dB for -2 dBFS
Line input sensitivity Adjustable from -6 dBm up to +24 dBm for 0 dBFS recording
THD at 1 kHz <0.1% Mic, <0.01% line (measured on AES out)
Frequency response Mic, 10Hz - 48 kHz ± 0.5 dB, Line ±0.2 dB (measured on AES out)
Input noise with condenser mic 0.88 µV (-119 dBm)
Input noise with dynamic mic 4 dB (measured ASA "A" loaded 200Ω
Signal-to-noise ratio >114 dB
Input level adjustment range 50 dB Mic and from -6 to +24 dB Line
Input filters LFA (with vortex filtering)
Slate microphone Electret behind the front panel

-Outputs
Analogue line output 2 x XLR 4.4V max (+15 dBm)
Digital output XLR AES-3 (24 bit or 16 bit dithered)
Headphones 2 x Stereo 6.3mm (¼”) Jack 50 Ω
Internal speaker 1W

-Other
USB Host USB 2.0 connector type "A"
USB Device USB 2.0 connector type "B"
Time code IN/OUT 5 pin LEMO (SMPTE / EBU)
M/S Decoder Switchable
Word Clock 9-pole "D" type connector
Dither Menu selectable 24/16bits on Inputs and/or Outputs

-General
Dimensions 310 x 74 x 285mm (W x H x D) (Incl. battery box)
Weight 3.8 kg (8.3 lbs) (with battery pack)
Power supply Lithium-Ion, or external 9 - 16V (XLR 4 pole)
Power Consumption Approximately 10W
Charge time 3 hours (with supplied Lithium-Ion pack)
Ext. power out 2 Hirose 12V (max 1A)
Operating temp. From -20°C to +60°C (without internal Hard disk)
From 0?C to +50?C (Hard disk installed)
Relative humidity From 10% to 99% (non condensing)