Technics SBL 300 Owners Manual

Page 1

Technics

LINEAR PHASE SPEAKER SYSTEM

SB-LSDC)

OPERATING INSTRUCTIONS

The model and serlat number of this product may be found on the back
of the unit

Vou should note the model and sertat number of {ms unit in the space
provtded and retam this bookietasa permanent record of your purchase
t0 and tdenttfrcatlon In the event of theft.

MODEL NUMBER

SERIAL NUMBER

Before operatmg this speaker system, ptease read these instructions
compIeter,

Page 2

Thank you for selecting theTechnicsLinear Phase
Speaker System SB-LBOO. To obtain maximum
satisfaction from all of its many features as well as
the longest possible service, be sure to first read
these instructions carefully.

No matter how complex musical waveforms may be, all are
composed of frequency components with their own amplitude
and phase. in order to faithfully reproduce such musical wave-
forms, not only mustthe amplitude (sound pressure)/frequency
response be flat, the phase/frequency response must also be
linear. At Technics we have, by using BED (Bucket-Brigade
DeVice) technology, succeeded in developing our own unique
phase-measurement system. As a result of long and deep re,
search into the phase characteristics of speaker systems, and
by developing wide-range, high-performancespeakerunitsand
arrangingthem inthe ideal position, andfurthermore bydesigne
ing a new crossover network, we were able to successfully pro»
duce a true liner-phase speaker system.

INSTALLATION OF YOUR SPEAKER SYSTEM

The sound reproduced by a speaker system is easilyinfluenced
by such factors as room acoustics and the place where it is
placed in the room. Before finally deciding upon the place
where the speaker systems are to be placed. please carefully
read the following information.

0 in general, if a speaker system is placed on the floor, neara
corner or near a wall, the level of the bass sound will be
increased by the reflections of the sounds from the wall and
floor. Consequently, it is possible to adjust the bass sound to
some extent by changing the distance between the speaker
systems and the wall and/or floor. Determine the location of
the speaker systems which gives the best sound reproduc-
tion. therefore, depending upon the actual conditions of the
room in which they are to be used.

_o If the speaker system faces toward a hard wall oraglassdoor
or window. it is recommended thatcurtainsorsimilar materi-
al be used in order to prevent undesirable resonance and
sound reflection, especially of the treble soundr

. Vibrations from the speaker systems may be transmitted to a
record player, causing acoustic feedback (howling"). For
best results, the speaker systems should not be placed near
the record player. and should never be placed on the same
table or shelf as the record player. it is often veryeffective, in
order to prevent howling, to place a thick piece of felt
beneath the speaker systems and the record player.

CONNECTING THE SPEAKER SYSTEM

o Be sure to turn off the power of the amplifier before connect-
ing the speaker systems to it.

o The impedance of this speaker system is 8 ohms. Be sure
that the load impedance of the amplifier to be used is 4 ~ 16
ohms.

o The input terminals of this unit are on the rear surface of the
enclosure. The polarity (+ and -) of each input terminal is
indicated. When connecting speaker wires from the ampli-
fier, be sure that the left and right connections and the plus
and minus connections are made correctly.

When speaker connection wires are connected to the "system

input terminals, make the connections as shown in figure 1a.

1. Strip about 10mm (1/2) of the insulation from the wire, and
then twist the core.

2. Loosen the terminal knob byturning it counterclockwise 20r
3 times, Insert the wire into the hole on the knob until the
core cannot be seen.

3. Tighten it by turning it clockwise.

2. 3.
7 " Q\ Fig.1a.

Ifthick wire is used,make the connection as shown in figure 1b.

1. Strip about 20mm (1") of the insulation from the wire, and
then twist the core.

2. Remove the terminal knob by turning it counterclockwise.
Insert the core wire through one of the notches on the ter
minai base, pass it clockwisearound thescrew. and out from
the other notch.

3. Put the terminal knob back on the screw, and tighten it by
turning it clockwise.

Fig. 1 b.

Be sure that the core wires dont touch each other.

POWER-HANDLlNG CAPACITY

The power-handling caracity of this unit is indicated in the

specifications, and is determined according to the temperature

increase of the voice coils.

o If the amplifier to be used has an output power which ex-

' Ceeds the power-handling capacity of this unit. be sure that
the amplifiers volume control is set so that exceSIlve input
is not applied to the speaker system.

o Even if the amplifier to be used has an output powerwhich is
less than the power-handling capacity ofthis unit, the output
of the amplifier will become distorted and excessive input
will be applied to the speaker units, especially forthe middle
and high freq uencies. if the input signals to the amplifier are
too large or the amplifier volume level is too high. Also note
that higher-than-normal power is applied to the speaker
systems if the tone controls of an amplifier or a frequency
equalizer are used to raise the level of bass and/or treble
sounds. When adjusting the volume level, therefore, do so
with great care: confirming that amplifier output is not dis-
lorted.

- The power-handling capacity of this unit is set for repro«
duction oi ordinary music. If an oscillator or test record is
used to produce a continuous signal such as a sine wave,
etc., a signal exceeding 5 watts must never be applied.
Usually 1 watt of sine wave is enough to test a speaker
system using an oscillator or test record.

0 if the following special types of signals are applied to the
speaker system, be sure to reduce the volume level of the
amplifier.

..

lnterstation hiss on the FM broadcast band.

Output from a tape deck during fast forward or rewind.

3. Acoustic feedback from a microphone oran electric musical
instrument.

4. Shock" noise which occurs when input or output connec.

tion cords are connected or disconnected or when a phono

cartridge is replaced,

N