JL Audio Gotham g213 Owner's Manual page 28

RECOMMENDED SETUP PROCEDURES (continued)
Subwoofer System Setup:
Once you have set the controls on your home theater receiver or preamp/
processor and on your Gotham(s) to the settings recommended on pages 26 and
27, you are ready to begin setting up your Gotham for optimum performance.
1) Level Setting
Using familiar music or movie material with deep bass content, adjust the
subwoofer level to blend with the other speakers using your receiver or preamp/
processor's subwoofer level control. Th is method is more immune to tampering
than using the Gotham's "Master Level" knob (think toddlers or curious visitors).
In the unlikely event that the subwoofer level control in your receiver or
preamp/processor cannot be turned up enough to level match the Gotham, return
that control to "0". Th en, fl ip the Gotham's "Level Mode" switch to "Variable"
and with "0" as your reference point (REF mode gain and Variable "0" gain are
identical) use the "Master Level" control to level match the subwoofer with the
other speakers. MAKE NOTE OF THIS SETTING FOR FUTURE USE.
For more detailed information on your Gotham's level setting controls, please
refer to the "Level Mode" and "Master Level" sections on page 29 of this manual.
2) Polarity and Phase Adjustment
It is oft en helpful to have a second person operating these controls so that you
can easily hear the changes from the primary listening seat.
Listening to familiar source material (preferably music with good upper bass
and midbass response), fl ip the "Polarity" switch from "0" to "180" and listen for
diff erences. Th e correct setting will sound most natural with the best upper bass
punch and articulation. If both sound similar, choose "0".
Once Polarity is set, use the same music material to audition diff erent "Phase"
control settings and choose the one that further enhances the upper and midbass
response. If you can't hear a diff erence, set the control to "0."
3) Experiment with alternative subwoofer locations (if necessary).
If you are satisfi ed with the basic performance of your subwoofer you are ready
to move on to the next step. If not, we recommend that you experiment with
the position of your subwoofer until you are pleased with its basic performance.
Experimentating with placement is KEY to a superior sounding system. Moving the
subwoofer just a few feet can have a signifi cant eff ect on the smoothness of the bass.
For each new position, start with the polarity and phase controls at "0" and repeat the
setup process beginnng with Step 1.
IMPORTANT! WRITE DOWN ALL SETTINGS PERFORMED IN STEPS 1-3 FOR
FUTURE REFERENCE.
Page 28
IMPORTANT
| Gotham g213