Altec Lansing 3300A - Manual (Page 8)

Operating Instructions for the Altec Lansing 3300A Series Mixing Consoles
baleinced; active balancing
allows elimination of the input
transformer (along with its
limitations) while maintaining
the RF auid hum rejection of a
good transformer-coupled input.
It is important during operation
or testing of the mixer that all
faders remain fully down when­
ever the mic input is not pro­
perly terminated with a micro­
phone or an equivalent 150-ohm
source. An open mic input
invites the introduction of high
noise levels which could produce
lower quality sound or an
incorrect test measurement.
High-Z Line Input; A
standard Vi-inch phone jack is
used for balanced or unbalanced
line level signals. Examples of
these signeds include most
electronic keyboards, drum
machines and synthesizers, tape
decks, CD players, etc. All input
channel controls, including the
variable TRIM control, affect
the LINE input. Maximum
input
level before preamp
clipping is -1-24 dBu (12.3
Vrms).
If a sufficient signal level is not
possible with the TRIM control
at its furthest clockwise
position, the input signal must
then be treated as a mic level
signal and connected to the
microphone input. If necessary,
use an appropriate balancing
transformer or a direct box with
the microphone (XLR) input.
AVX RETURN (AUX 1 and
AVX 2): The AUX RETURN
jack(s) feed signals to the
subgroup buses. The signal is
controll^ by the RETURN and
PAN front panel controls.
4. AVX IN (AVX 1 and AVX 2):
The AUX IN jack(s) will put
signals directly into the respec­
tive AUX bus. Crosstalk and
buffering protection .re
provided by the input circuit
Eind the signal level is controlled
by the external source.
5. MON IN: The MON IN J^ck
will put signals directly onto the
monitor bus. Crosstalk and
buffering protection are pro­
vided by the input circuit and
the signal level is controlled by
the external source.
6. TAPE RETURN: These RCA
jacks Eillow a tape deck or CD
player to be directly connc-cied
to the mixer. The input is fed
into the left and right sub­
groups and its level is controlled
by the TAPE L and TAPE R
front panel controls. These jacks
can also be used as other AUX letun s.
ALTEC LANSING* CORPORATION • a Mark IV Company