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UNPACKING/PRE-INSTALLATION INSTRUCTION
Unpack your new subwoofer carefully, keeping the carton and packing
material for future use. Check the condition of your unit, reporting any
damage which may have occurred in transit to your dealer or shipping
company.
GLOSSARY
The following list of terms with their definitions is offered as a help in
understanding the set-up and operation of your subwoofer.
Crossover (xover) - an electrical filter with lo-pass or hi-pass
characteristics that divides the frequency range into bands of low, middle,
or high frequencies to match the capabilities of specialized loudspeakers
like subwoofers that are only effective at reproducing limited frequency
ranges. The crossover frequency is the frequency where the filter begins
to attenuate or reduce the level of the signal.
Full range - refers to signals which cover the entire audio frequency span
from 20 Hz to 20 kHz.
Hi-pass - a type of filter circuit that allows high frequencies to pass, while
reducing the level of low frequencies with the transition from high to low
occurring at the crossover frequency. The rate of reduction of the signal
is called the attenuation rate or slope and is measured in decibels (dB)
over a change in frequency of one octave, which is a doubling or halving
of frequency.
Impedance - the resistance to the flow of current in an alternating
current circuit (such as with music). Line level circuits are typically a high
impedance of several thousand ohms, while speaker level circuits are
usually a low impedance of a few ohms.
Line level - the type of signal produced at the outputs of preamplifiers,
tape decks, CD players, etc., with a typical value of a volt or less in a high
impedance circuit. Sometimes called low level signals, they are routed
using shielded cables which are usually terminated with RCA phono
connectors.
Lo-pass - a type of filter circuit that allows low frequencies to pass, while
reducing the level of high frequencies with the transition from low to high
occurring at the crossover frequency. The rate of reduction is called the
attenuation rate or slope and is measured in decibels (dB) over a change in
frequency of one octave, which is a doubling or halving of frequency.
Speaker level - the type of signal produced at the outputs of power
amplifiers that may be many volts in a low impedance circuit. Sometimes
called high level signals, they are routed using two conductor unshielded
wire of 18 gauge or larger. Connections are usually made with stripped
ends of wire gripped in spring loaded terminals.
10
B) For use with A/V preamps and receivers that have 5.1 channel line
level outputs.
If your preamplifier or receiver has a single “subwoofer” output or “LFE”
output, connect a shielded cable from the preamplifier output to either one
of the subwoofer line level inputs. Refer to Figure E.
3
FIGURE E
OUTPUTS
SUB
Preamplifier