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Klipsch LF-10 Manual

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LOW PASS (Hz)
This control is a variable filter that controls the upper frequency limit of the subwoofer from 40 to
120Hz. Use this control to compensate for room acoustics, subwoofer placement, type of hookup and
the capabilities of your main speakers. Proper adjustment of this control helps smooth the transition
in the bass frequencies between your main speakers and the subwoofer. Setting the filter too high will
cause an overlap in the bass frequencies reproduced by your main speakers, resulting in muddy and
indistinct low frequencies. Setting this control too low may cause the output of the subwoofer to
sound disconnected from the bass range being reproduced by the main speakers. In light of this, we
encourage you to experiment with various settings.
If your main speakers are being high pass (bass) filtered by your subwoofer, the “LOW PASS (Hz)”
should initially be set near the frequency of this filter (either 50 or 100Hz line level, or 100Hz
speaker level). Room acoustics will often dictate a slightly higher or lower setting of this control.
If your main speakers are being fed a full range signal, the “LOW PASS Hz” control should be set
near the low frequency limit of your main speakers (typically at the lowest setting of the control with
larger full range speakers). In all cases, experiment due to variability in speaker placement, room
acoustics and associated equipment.
LFE LEVEL
This control only affects the volume of the signals connected to the “LFE/BYPASS IN” input. These
signals are mixed with the bass signals that are fed into the “LINE IN” or “SPEAKER IN” inputs.
This control provides a means to balance the LFE signal level to properly blend with the standard
bass signal level.
NOTE: Suggested control position for the initial set-up: 9 o’clock
CAUTION: LFE SIGNALS CONTAIN EXTREME LOW FREQUENCY INFORMATION. AVOID
EXTREME CLOCKWISE (HIGHER) ADJUSTMENTS OF THE “LFE LEVEL” CONTROL TO PRE-
VENT OVERDRIVING AND DAMAGE TO THE SUBWOOFER AMPLIFIER AND ITS WOOFER.
HIGH PASS SELECT
This switch selects either “50Hz” or “100Hz” as the bass cutoff frequency for your main speakers.
This switch only affects “LINE OUT” connections. Refer to the lefthand side of Figure B. This
requires that your subwoofer be connected to electronics offering both the preamp output and the
power amp input jacks. Typically the higher “100Hz” setting is used for smaller bookshelf speakers
to relieve them of the strain of reproducing loud, deep bass frequencies. The “50Hz” setting is typi-
cally selected for larger floorstanding speakers as they are better able to handle bass energy, only
needing reinforcement at the lowest frequencies.
The subwoofer’s high pass filter has a gentle cutoff so there is still some audible signal content in your
main speakers below the circuit’s cutoff frequency.
POWER
This switch has conventional power “ON” and “OFF” positions as well as an automatic setting. In
the “AUTO” position, the subwoofer will turn itself on when it receives a signal from your system.
If no signal is sent for a period of 15 minutes, the sub will turn itself off. A red power light indicates
a standby mode in which the amplifier will turn on when it senses a signal. Green indicates the sub-
woofer is on and receiving a signal.
PHASE
This switch is used to reverse the polarity of the subwoofer relative to your main speakers, allowing
you to compensate for any acoustic cancellation of bass energy caused by the listening room. Audition
a recording with a prominent, repetitive bass line. Use the setting that yields the greatest quantity of
bass (0° or 180°). The proper setting of this control is affected by room acoustics and the placement of
the subwoofer in the room. You may need to repeat this procedure if the subwoofer is repositioned.
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