Manual-4
OPERATING INSTRUCTIONS
MASTER STEREO INPUTS
Apply a source program to the MASTER INPUTS and turn
up the MASTER LEVEL until the green signal-present LEDs
light up. Further adjustment of this control raises or lowers the
volume level in all headphones simultaneously, i.e., all those be-
ing driven from the MASTER INPUTS. The MASTER LEVEL
does
not
affect channels driven from the direct stereo INs.
INDIVIDUAL LEVEL CONTROLS
These adjust the level in each set of headphones to the desired
loudness. When using a direct stereo IN, only this control affects
the volume in the headset—the MASTER LEVEL is bypassed.
DIRECT STEREO INPUTS
These allow completely independent operation of up to six differ-
ent stereo programs. These Inputs are stereo only, and wired to
accept unbalanced signals, using the tip=left, ring=right conven-
tion. Unbalanced mono sources require using a stereo ¼" TRS
plug and shorting the tip and ring together.
Any channel not directly driven is automatically driven from
the MASTER INPUTS.
When using balanced mono sources, internal jumpers must
be moved as in Figure 2 below. Jumpers are wired at the factory
for stereo. Jumpers must be moved for balanced mono operation.
Each jack is jumpered separate, so any combination of input
types is possible within a single HC 6S.
SHOCK HAZARD
WARNING
: Any service requiring access to the inside of the
unit (including changing jumpers and switch settings) should be
done by qualified service personnel.
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SIGNAL-PRESENT LEDS
These light up with any signal input above -20 dBu. They are
located in the signal path after the MASTER INPUTS and
before the individual LEVEL controls. This means that adjusting
the MASTER LEVEL affects the SIG LEDs, while adjusting the
individual LEVEL controls does not. When using a direct stereo
IN, the LED responds to that Input only. This means these
indicators aid in quickly identifying which stages are driven by
the MASTER INPUTS and which by the direct stereo INs:
Simply turn the MASTER LEVEL up and down and observe
which LEDs respond. These are the channels being driven by the
MASTER INPUTS.
STEREO / MONO SWITCH
This serves the basic function of allowing both Left and Right
channels of all headphones to be driven from a mono MASTER
INPUT. In some instances a stereo program can be confusing
for live monitoring purposes, due to extreme separation and the
increased difficulty in perceiving several different volume levels.
Using the MONO / STEREO switch converts the system to
mono operation to better suit these particular monitoring needs.
FRONT PANEL OUTPUT JACKS
These jacks parallel the rear OUTs, providing easy access patch-
ing into any channel for cueing or additional monitoring. When
using more than six sets of headphones at once, keep two things
in mind:
1. There are still only six LEVEL controls. Additional headsets
must double up with those already in use. To avoid intolerable
volume differences to two listeners on the same channel of the
HC 6S, use headphones of the same make and model.
2. The HC 6S has limited power output. The more headphones
you connect to it, the less power there is available to each set,
and the more strain on the HC 6S. Blasting 10 or 12 sets
of low impedance headphones is asking too much from the
HC 6S. To lessen the power drain from the HC 6S, use only
high impedance (100 Ω or greater) headphones when paral-
leling.
Figure 2. Stereo Unbalanced / Mono Balanced Jumpers
Shipped as Stereo Unbalanced.
To channels 2 - 6
