Page 7 of 15 Copyright © NAGRAVISION S.A. 2011 August 19, 2011
Led dimmer (13)
Permits to reduce the led brightness (reduces power consumption)
Filter selection (14 & 15)
Unlike most other pieces of equipment, the Vortex filter as well as the low cut filter is embedded in the very
front-end of the microphone preamplifier. The Vortex filter specifically designed to give ultimate protection
against wind / boom microphone noise. This filter is designed to allow the Nagra EMP to be used in the
most difficult conditions on location.
The input filter on the Nagra EMP is a hardware filter and is therefore not software programmable. The
reason for this choice is simple. A software programmable filter is a digital filter in the heart of the digital
part of the audio chain. Wind noise coming into the preamplifier will already have done its distortion and
overloading directly in the preamplifier long before it gets to the digital filtering stage. The filters in the
Nagra EMP roll off -3 dB at 150 Hz and then at 12 dB per octave. If an alternative curve is required, then
provision is made on the input circuit board to add capacitors accordingly and the necessary values can be
supplied if necessary.
The low cut filter roll off -3 dB at approximately 60 Hz.
3 possibilities: “Flat”, “Low cut” or Vortex”.
Recorder control and indicator (16)
Turns on or off the built-in 16 bit recorder. This recorder has a built-in recording capacity of 2 GB of Flash
memory. The recordings can be made in a PCM BWF or WAV format as well as in MP2.The setup of the
recorder as well as the download of the files is made via a Nagra EMP software on PC through the mini
USB port.
Power on switch (17)
When set to “ON” the led above the switch will light up. When pulling the switch to ”TEST”, in the case of
the use of internal batteries, the left modulometer gives an indication of the battery status. At the moment
that the power switch is set to off, the power led starts blinking for 5 seconds before the power off takes
place. So during a little less than 5 seconds, the switch can be set to ON without switching OFF the unit.
