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Optimum Series User’s Manual - 9
REAR PANEL CONNECTIONS -
DETAILED EXPLANATION
Your new subwoofer is equipped with both speaker-level and line-level inputs. Use the RCA/Phono type “INPUT”
jacks when connecting your subwoofer to a pre-amp, signal processor, or line-level crossover. The “SPEAKER
LEVEL INPUT” jacks connect directly to the speaker outputs of an integrated amplier or receiver. Your amplier
section will notice no additional loading eects when you use these inputs because of their high impedance.
Note: Do not use both the RCA/Phono “INPUT” connections and “SPEAKER LEVEL INPUT” connections
simultaneously.
Low-Pass Crossover
Both sets of inputs sum the left and right channels together and the resulting signal is passed through an
adjustable low-pass crossover before being amplied. The crossover control allows you to adjust the upper
limit of the subwoofer’s frequency response from 40 to 135 Hz. The subwoofer’s response will begin rolling o
above the frequency you set this control to. (See note above about frequency limits.)
You should set the crossover frequency to obtain a smooth and seamless transition from the subwoofer to the
main speakers in your system. Do this by listening to the blend between your satellites and subwoofer using
familiar material. If your main speakers are smaller units with limited low frequency output, you may wish to
choose a higher frequency (such as 100 -120 Hz) than you would with larger speakers which have greater low
frequency output. With larger speakers, you might start with this control set lower, such as 70 Hz.
Subwoofer Direct
Subwoofer Direct is the leftmost setting on the low-pass crossover knob and will allow frequencies up to 200
Hz into the subwoofer. If you are not using an external crossover, we recommend that you use the one provided
within the subwoofer for optimum performance.
Caution!!!
To avoid damage to your main amplier, be sure to maintain correct polarity when making all connections. Red
(positive) to red, and black (negative) to black. Be sure that all connections are tight, and that there are no loose
strands or frayed wires.
Power Switch
The master power switch is located on the middle left half of the unit. This rocker style switch is the main on/o
for the unit. This switch should be set to position 1 for on (up), 0 for o (down).
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