DACS Audio MicAmp - 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 MicAmp 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 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.
DACS LTD, Stonehills, Shields Road, PELAW, Gateshead, Tyne and Wear NE10 OHW
Tel:+44 (0) 191 4382500 | Fax: +44 (0) 191 4382511 | www.dacs-audio.com | [email protected]