JL Audio Gotham g213 Owner's Manual page 20

Input Mode Switches:
Two switches are located on the rear panel to control unbalanced signal
grounding and master/slave operation.
"Grounded / Isolated" Switch
Th e "Grounded / Isolated" Input Mode switch aff ects only the unbalanced
RCA inputs and is designed to facilitate a quiet, hum-free connection to your
audio or home theater system. Th is feature is included to deal with the signal
grounding issues oft en encountered in home theater systems when several
components from diff erent manufacturers are interconnected.
Th e Gotham ships with this switch in the "Isolated" mode. If, with all system
components connected and turned on (but no source material playing), you hear
a continuous low-frequency hum through your Gotham, fl ip this switch to the
"Grounded" position and evaluate the diff erence in the noise level. Use whichever
switch position provides the least hum or noise.
IMPORTANT: PLEASE NOTE THAT CHANGING ANY COMPONENT IN THE
OPTIMIZED SYSTEM (RECEIVER, AMPLIFIER, DVD PLAYER, ETC.) COULD
ALTER THE SIGNAL GROUNDING SCHEME AND CAUSE HUM TO APPEAR IN
YOUR PREVIOUSLY QUIET SYSTEM. IF YOU ADD OR CHANGE AN UPSTREAM
COMPONENT IN YOUR HOME THEATER SYSTEM, YOU MAY NEED TO
REVISIT THIS INPUT MODE SETTING ON THE GOTHAM SUBWOOFER FOR
OPTIMUM NOISE PERFORMANCE.
Master / Slave Switch
Th e Gothams are designed to easily accommodate the implementation
of multiple subwoofers in your home theater system through a master/slave
connection chain. Th is method allows you to utilize the signal processing
features of one Gotham to centrally control multiple Gothams in the room.
Master/Slave functionality also makes it possible for the A.R.O. system to
optimize the response of a multiple subwoofer installation.
Th e Gotham ships with this switch in the "Master" position. If you are using
a single Gotham you will use the "Master" position and you need not concern
yourself with this section any further.
If your installation incorporates two or more Gothams, you will designate one
Gotham as the "Master" and all others in the system as "Slave" subwoofers via
the "Master/Slave" switch on the rear amplifi er panel of each Gotham. LED's on
the front panel of the Gotham are provided to indicate whether the "Master" or
"Slave" mode is selected for a given subwoofer.
From the Gotham operating in "Master" mode, the "Output to Slave" signal
carries any signal processing selected on the Master Gotham (including the
Master Level setting and A.R.O. processing) to further Gothams operating in
"Slave" mode. "Slave" subwoofer signal processing and level controls will be
inoperable. In this mode, the user does not have to worry about level, crossover,
and other settings for the slave subwoofers.
Technical Notes:
• Selecting the "Slave" position defeats all user-defi nable signal processing and
the master level control. Because of this, there are some special situations in
which you may want to operate a single Gotham in "Slave" mode. If you are
utilizing outboard signal processing and level-matching controls, activating
the "Slave" mode will prevent anyone from aff ecting system parameters with
the manual controls on the Gotham.
Page 20
IMPORTANT
| Gotham g213