Nagra VI 8-Channel Digital Recorder

Nagra VI 8-Channel Digital Recorder

Nagra VI 8-Channel Digital Recorder

B&H # NAGRAVI
Nagra VI 8-Channel Digital Recorder

Nagra VI 8-Channel Digital Recorder

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  • 1Description

The Nagra VI 8-Channel Digital Recorder from Nagra offers 24-bit word length and sampling frequencies from 32 up to 192 kHz. There are 6 analog inputs, 4 of which are equipped with high-quality microphone preamplifiers, and 2 AES inputs. The Nagra VI 8-Channel Digital Recorder is equipped as standard with a full SMPTE/EBU time-code system including a chase synchronizer, iXML metadata, programmable digital filters and monitoring for Ambisonic microphones.

The principal recording media is a 120GB internal hard disk. All main functions are located on the front panel of the recorder, and all set-up features are accessed through ergonomic menus and shown on the 3.5" TFT sunlight-readable display. The Nagra VI is fitted with an interchangeable 4.6Ah Lithium-ion battery pack, and supplied with a mains power supply for charging. The plastic front is supplied with two plastic handles which also serve to protect the front of the unit from accidental damage. A carrying case and strap for over-the-shoulder operation and a pair of legs to incline the recorder for easier table-top operation are also supplied.

Audio Inputs

The Nagra VI 8-Channel Digital Recorder offers six independent analog audio inputs. Inputs 1 - 4 are equipped with traditional Nagra microphone preamplifiers for dynamic and phantom +48V microphones and menu-selectable sensitivity for different microphone types. An audio limiter can be selected for each of the microphone inputs and can be arranged in pairs if desired. The four transformers offer fully floating inputs for the dynamic microphones, giving a improved signal-to-noise ratio. The remaining two analog inputs are line level 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 +24 dB. The two input connections (channels 5 + 6) double up as AES inputs (A and B) when selected to digital input mode. A total of 8 channels can be recorded; 6 audio inputs + a two channel mix, or 8 inputs assuming both AES inputs are used for 4 digital inputs.

Zipper Noise Suppression

The unit 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 analog recorders, but with the advantage of the precision offered by digitally controlled encoder devices, and hence an increase in the perfection of all recordings.

Recording Medium and Format

The Nagra VI records to a 120GB internal 2.5" hard disk. An extractable compact Flash card is used to record a copy of the audio tracks depending on the user's track selections. The Nagra VI allows approximately 15 minutes of 8-track 24-bit/48 kHz recording per GB of available disk/card space. The compact flash card section is equipped with a "Hot-Swap" possibility, meaning that the CF card can be removed and replaced while the Nagra VI is powered up, without causing any damage to the card or the recorder. The Nagra VI records using Broadcast Wave File (BWF) format and is iXML-compatible for the metadata, making the files compatible with all modern post-production equipment.

Color Display

The Nagra VI is equipped with a sunlight-readable 3.5" color TFT display with a resolution of 320 x 200 pixels. This specially designed high-luminosity display is used to visually indicate not only the status of the Nagra VI but also the bargraph modulometers, take number, time code and the current operating modes of the machine. It is also used to display the menu system for all the machine parameters. When the display is in the menu mode, the audio levels can still be monitored using the LEDs on the front panel. A choice of user-selectable screens can be displayed in the Test, Record and Play positions, including the modulometers ONLY, according to the operator's desire. The colors and intensity of the screen can be adjusted by the user.

Channel Mixing

The Nagra VI is capable of mixing the audio from the 6 analog inputs to a stereo mix on channels 7 + 8. The output of the mixer can be set to both mono or stereo. Each microphone-input level and L/R pan can be controlled using the arrow keys, thus providing versatile mixing facilities. The mix channels can be recorded to the CF card in the copy process and to the internal drive in the normal manner. If channels 7 + 8 are not being used for the mix, then all 8 inputs can be used for recording (using both digital inputs). Mixing to the audio outputs during playback is also possible.

Media Verification

The Nagra VI is equipped with a powerful system to verify the read-and-write speed permitted by the different media (internal drive, CF card and USB drives). The NAGRA VI allows the user not only to verify the digital id of the CF cards but also to check the read/write capacity of these media. Poor quality, low-cost cards can cause severe problems when trying to write high bit-rate linear-PCM audio in real time.

File Backup

The Nagra VI is equipped with two high-speed USB 2.0 ports. One is designed to connect the Nagra VI to a computer for file transfer. The second is a "host" connection and is used for connection of an external drive (USB key, external hard disk, DVD-RAM burner) or an external device such as a USB keyboard.

Templates

The Nagra VI can store up to six internal templates containing all the user-selectable settings and parameters of the recorder. These can be individually named and recalled at any time to rapidly change the settings of the machine depending on the desired operating situation. Templates may also be stored on external media (6 per medium) as text files and can be edited using a simple text editor such as Notepad. This system allows for the creation and use of partial templates if desired.
Time Code
The internal time-code system and all the internal digital electronics of the Nagra VI are clocked by a crystal which is a "Stratum III" TCXO which has been artificially aged in an oven to maintain stability. This crystal gives a guaranteed overall stability better than ±4.6 ppm over a period of 15 years throughout a temperature range from -20 to +70°C. The drift due to temperature changes is less than 0.28 ppm. The Nagra VI will handle all the standard SMPTE / EBU frame rates as well as the 23.976 fps rate for the HD format. All the frame rates can be pulled "up/down" for the NTSC markets. The internal chase synchronizer allows the recorder to follow / chase any external time-code signal for post-production synchronization purposes.
In the Box
Nagra VI 8-Channel Digital Recorder
  • 4.6 Ah Lithium-Ion Battery Pack
  • Power Supply
  • Carrying Case
  • Support Legs
  • Instruction Manual (USB Key)
  • Limited 2-Year Warranty
  • Table of Contents
    • 1Description
    Recording
    Data Storage 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 and D/A Conversion 24-bit Sigma Delta
    Tracks 8 individual
    Sampling Rate 44.1, 48, 88.2, 96, 176.4 and 192 kHz (with 0.1% pull up / down)
    Recording Capacity 15 mins of 8 track 24-bit/48 kHz per GB of disk / memory
    Mono / Polyphonic Selectable
    Pre-Recording Buffer up to 20 seconds @ 24-bit/48 kHz on 8 tracks, Max 10 seconds @ 24-bit/96 kHz and 24-bit/48kHz on 8 tracks
    Display 3.5" (88.9 mm) color TFT LCD
    Level Meters On color display AND by LED for microphone inputs
    Inputs
    Digital Inputs 2 x XLR AES-3 shared with analogue inputs 5+6
    Analog Inputs 4 x symmetrical XLR Microphone (Dynamic, +48 V Phantom) / line
    Input Sensitivity 2.8, 10 and 30 mV/Pa selectable
    Limiter Selectable on microphone inputs, individual or in pairs. Active at -8 dBFS, max +36 dB for -2 dBFS
    Line Input Sensitivity Adjustable from -6 dBm up to +24 dBm for 0 dBFS recording
    THD <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)
    With dynamic mic: 4 dB (measured ASA "A" loaded 200Ω
    Signal-to-Noise Ratio >114 dB
    Adjustment Range 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
    Analog Output 2 x XLR 4.4V max (+15 dBm)
    Digital Output XLR AES-3 (24-bit or 16-bit dithered)
    Headphones 2 x Stereo 1/4" (6.3 mm) Jack 50 ohms
    Internal Speaker 1 W
    Other
    USB Host USB 2.0 connector type "A"
    USB Device Support USB 2.0 connector type "B"
    Time Code In 5-pin LEMO (SMPTE / EBU)
    M/S Decoder Switchable
    Word Clock 9-pole "D" type connector (In / Out)
    Dither Menu selectable 24-/16-bit on Inputs and/or Outputs
    General
    Power Supply Lithium-Ion, or external 9 to 16 V (XLR 4-pole)
    Power Consumption Approximately 10 W
    Charge Time 3 hours (with supplied Lithium-Ion pack)
    External Power Outlets 2 Hirose 12 V (max 1 A)
    Operating Temperature From -4 to 140°F (-20 to +60°C) without internal hard disk
    From 32 to 122°F (0 to +50°C) (internal hard disk installed)
    Relative Humidity From 10 to 99% (non-condensing)
    Dimensions (W x H x D) 12.2 x 2.91 x 11.22" (310 x 74 x 285 mm) including battery box
    Weight 8.3 lb (3.8 kg) with battery pack
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