DACS Audio MicAmp2 - Manual (Page 5)

5 Earthing
The signal 0V is separate from the mains earth. The mains earth is connected to the
case of the device. If you wish to connect the signal earth to the mains earth or a
technical earth, this may be done by running a wire from the earth tag. This
connection should only be made by qualified personnel, if it is necessary. If in
doubt please call us.
6 & 7 Setting Gain
The gain for the MicAmpII is set using the stepped GAIN control in 6dB steps, and
then trimmed between 0dB and +10dB using the continuously variable TRIM control.
The scaling on the trim control allows accurate repetition of settings. The main lines
may be thought of as hours (0dB is 6 o'clock, and +10dB is 3 o'clock), while the
secondary lines are half hours. The settings may then be remembered or noted
down as times, making it easy to repeat them accurately. Optimum gain settings vary,
but see below for operating levels and overload indication.
8 Roll Off
The bass roll of is designed to minimise the pick up of unwanted rumble, and to have
little or no effect on the signal above the roll off frequency. The slope of 12dB / octave
and cut off frequency were selected to minimise very low earth borne rumbles (30Hz
cut-off) and more buzzy mains type noises (80Hz cut-off). The filter has no effect on
frequencies above the cut-off, and causes no 'bumps' in the frequency response.
9 & 10 Metering
The signal level and condition is show by the unique tri-segment LED meter and the
ultra bright overload LED. The segments of the LED meter illuminate increasingly
brightly as the signal level increases, with the Green LED illuminating first to indicate
that signal is present, the Yellow LED illuminates at +5dBm, achieving full brightness
at +13dB when the Red LED begins to illuminate. The Overload LED (!) illuminates
when the signal clips, and remains on for a few seconds.
* Calum Malcolm particularly like the meters; he said that they gave him a really clear sense of what was
happening wih the signal, better even than PPMs
DACS LTD, Stonehills, Shields Road, PELAW, Gateshead, Tyne and Wear NE10 0HW
Tel: +44 (0) 191 4382500 | Fax: +44 (0) 191 4382511 | www.dacs-audio.com | [email protected]