DCM Speakers TB2 - Manual (Page 7)

UNPACKAGING/PRE-INSTALLATION INSTRUCTIONS
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