MAIN SPEAKERS FULL RANGE
Connect the subwoofer’s left and right channel “LINE IN” jacks to a non-filtered (full-range) main
channel, pre-amp output on your receiver or pre-amp/processor. Refer to the lefthand side of Figure A.
This signal contains the normal bass information present in the main left and right channels. When
connecting to a component that has only a single pair of pre-amp outputs, “Y” adapters (splitters)
may be used to feed a signal to both the subwoofer and the power amplifier.
Note: When connecting to a mono subwoofer output on your electronics (preferably full range), add
a “Y” cord to the subwoofer end of the cable and connect to both line inputs. This will provide a sig-
nificant increase in the subwoofer’s output level when compared to the connection of just one of the
“LINE IN” inputs.
MAIN SPEAKERS LIMITED RANGE
If a bass limited (high pass filtered) signal is to be sent to your main speakers, connect your main
channel power amplifier inputs to the “LINE OUT” jacks on the subwoofer. Refer to the lefthand
side of Figure B. These outputs will remove frequencies below 50 or 100Hz from your main speakers,
depending upon the setting of the “HIGH PASS SELECT” switch. This type of hookup reduces dis-
tortion and increases the dynamic range of your main amplifier and speakers.
LFE/BYPASS IN (optional)
This input is used with 5.1 (six channel) surround sound systems. The LFE channel contains bass effects
information that is different than the bass signals present in the other channels to enhance the sound-
track’s impact. Connect the “LFE/BYPASS IN” input on the LF-10 and LF-12 to your electronic’s desig-
nated LFE output jack. The “LFE/BYPASS IN” requires a low pass filtered signal from your electronics
(high frequencies removed). Do not connect this input to a full range (unfiltered) pre-amp output.
Note: The peak level of this signal can be up to 10 decibels louder than main channel bass signals, so
caution should be exercised when connecting to this output and initially adjusting the subwoofer’s
“LFE LEVEL” control. Signals coming into this jack are not affected by the subwoofer’s adjustable
“LOW PASS (Hz)” filter or main “LEVEL” control. The “LFE/BYPASS IN” will not normally be the
only connection to the subwoofer, unless the LFE channel is the only signal the subwoofer will be
reproducing. The “SPEAKER IN” and “LINE IN” connections are the primary hookups. The “LFE
IN” is compatible with either line level or speaker level connections.
BASS MANAGEMENT
Most surround sound electronics are equipped with a bass management system that permits the selection
of either a full or limited range (bass filtered) operation for each speaker. When using the “LINE IN” or
“SPEAKER IN” connections on the subwoofer, configure the main channels of your surround electronics
for the “Large” or “Full Range” setting. When connecting to a subwoofer output, defeat the low pass
filtering on your electronics, if possible. If this cannot be done, use the “LFE/BYPASS IN” input and let
your electronics determine the low pass frequency for the subwoofer (the “LFE LEVEL” control now
becomes the primary subwoofer level control). Alternately, you can connect the subwoofer’s “LINE IN”
input to a subwoofer output and set the “LOW PASS (Hz)” control on the subwoofer to a lower cutoff
frequency if desired. Since the specifics of bass management systems vary from brand to brand, consult
your Klipsch dealer or the manufacturer of your electronics for more details.
Operating Controls
LEVEL
This control adjusts the volume of the subwoofer relative to your main speakers. Use this control to
compensate for room acoustics, subwoofer placement and the sensitivity of your main speakers. This
control affects the signals that are connected to the “LINE IN” or “SPEAKER IN” inputs. It does not
affect the volume level of your main speakers or signals connected to the “LFE/BYPASS IN.”
Suggested control position for initial setup: 10 o’clock.
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