Drawmer 1962 Digital Vacuum Tube Pre-Amplifier - Manual (Page 12)

1962 OPERATORS’ MANUAL 8
CONTROL DESCRIPTION
The 1962 comprises two independent audio channels plus a Stereo Mix section, and both
channels may be operated independently or linked for stereo operation. When used in linked
mode, the control-circuitry for both channels responds to the average of the two channel
settings. It helps to avoid confusion if both sets of channel controls have similar, or, as near
as possible, the same settings. Digital output capability is only available if a D62 digital
interface has been fitted.
CHANNEL INPUT
Source Select:
This four-position rotary switch selects the audio input source, which can be
Mic, Mic with 48V phantom power, Line or Aux. The Line and Mic inputs are
via rear-panel XLRs while the Aux input jack is located on the front panel. A
red LED shows when the phantom powered mic option has been selected.
Limit: The limiter is available for all input selections and, when enabled, will prevent
clipping in situations where the maximum input level cannot be determined
with accuracy. Use of the limiter also makes it possible to run the output
closer the digital peak level (0dB) without the risk of clipping. Note that with
Line input selected the Limit headroom is only 10dB. Large amounts of gain
could exceed this, resulting in distortion.
A status LED indicates that the limit function is active, and if the signal level
is increased to a point where the limiter operates, the GR (Gain Reduction)
LED will illuminate. It is usually acceptable for the GR LED to flash on
occasional signal peaks, but if it lights regularly or almost continuously, it is
invariably best to reduce the input level using the input gain control, and/or
adjusting the EQ and Tube Drive settings.
For stereo operation, the limiters should either both be active, or, both
bypassed, to prevent an unwanted image shift(s) during limiting.
As with all limiters, excessive amounts of limiting will be audible, but used
carefully, the limiter offers protection against transient clipping while retaining
tonal transparency.