Altec Lansing 1662A - Manual (Page 6)

6
Operating Manual -1662A Mic/Line Mixer
6. REAR P 6. REAR P 6. REAR P 6. REAR P 6. REAR PANEL FEA ANEL FEA ANEL FEA ANEL FEA ANEL FEATURES TURES TURES TURES TURES
6.1 Micr 6.1 Micr 6.1 Micr 6.1 Micr 6.1 Microphone Input ophone Input ophone Input ophone Input ophone Input
The 1662A microphone input is an active
balanced type with a nominal impedance of
1200 ohms. Its noise performance is best with a
200 ohm microphone. The mic input connector
is a 3-pin Euroblock with the shield on (G), the
(+) in-phase connection on (+), and the (-) out-
of-phase connection on (-). If the input is
unbalanced, or single ended (meaning there is
only one signal wire with a shield) connect the
signal wire to (+), and connect the shield to
both (-) and (G).
6.2 Input Pad 6.2 Input Pad 6.2 Input Pad 6.2 Input Pad 6.2 Input Pad
The input pad is a 20dB attenuation
switch for extremely loud microphone or line
level inputs. It should normally be left in the
"out" position for best signal to noise ratio, but
can be used when the input is being clipped
with the gain and level control at minimum.
6.3 Channel TRS Insert 6.3 Channel TRS Insert 6.3 Channel TRS Insert 6.3 Channel TRS Insert 6.3 Channel TRS Insert
A 1/4" stereo phone jack insert point
allows a device such as a remote level
controller, graphic equalizer, noise gate,
compressor/limiter, or direct out recording
device to be used with one or more input
channels.
The 1662A TRS (tip-ring-sleeve) insert
jacks use the tip for output and ring for the
returning input. These signals will be
unbalanced, so cable length should be at a
minimum to maintain low noise.
To use the TRS insert as a Direct Line
Output (pre EQ) for recording individual
channels, make a special cable with tip and ring
connected at the 1662A end and a tip-sleeve
mono plug at the other end. Connecting tip
and ring at the mixer insert jack is necessary for
uninterrupted signal within the mixer when
using direct line outputs.
6.4 Sum Inputs 6.4 Sum Inputs 6.4 Sum Inputs 6.4 Sum Inputs 6.4 Sum Inputs
The RCA sum inputs on channels five and
six are typically used for auxillary audio sources
such as a disc or tape player, summing a stereo
source into a mono signal for each channel's
input. Using the sum inputs does not prevent
Euroblock
Connector
System
+
- G
+
- G
Tip
Ring
Sleeve (Ground)
Stereo Phone Plug