DCM Speakers SW10 Unpacking/Pre-Installationinstructions, Glossary, Preamplifier OUTPUTS SUB

B)For use with A/V preamps and receivers that have 5.1 channel line level ouputs.

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.

Preamplifier

OUTPUTS

SUB

FIGURE E

UNPACKING/PRE-INSTALLATION INSTRUCTIONS

Unpack your new subwoofer carefully, keeping the carton and packing material for future use. Also, write the serial number in your home records for later reference. 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.

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