Technics SB 2070 Owners Manual

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Technics

LINEAR PHASE SPEAKER SYSTEM

88-2070

OPERATING INSTRUCTIONS

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Operating Instructions

Thank you for selecting the 'Ilechntcs
Linear Phase Speaker System 88-2070.
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.

INSTALLATION OF YOUR SPEAKER
SYSTEM

The sound reproduced by a speaker system is easily
influenced by such factors as room acoustics and
the place where it is placed in the room. Before final-
ly deciding upon the place where the speaker sys-
tems are to be placed. please carefully read the
followmg information.

o In general. if a speaker system is placed on the
floor, near a 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. Deter-
mine the location of the speaker systems which
gives the best 50und reproduction. therefore.
depending upon the actual conditions of the
room in which they are to be used.

0 lithe speaker system faces toward a hard wall ora
glass door or window. it is recommended that
curtains or similar material be used in order to
prevent undesirable resonance and sound reflec-
tion. especially of the treble sound.

0 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. lt is often
very effective. in order to prevent "howling". to
place a thick piece of felt beneath the speaker
systems and the record player.

CONNECTING THE SPEAKER
SYSTEM

0 Be sure to turn off the power of the amplifier be-
fore connecting 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 sur-
face of the enclosure. The polarity (i and -) of
each input terminal is indicated. When con-
necting speaker wires from the amplifier. 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 terminals. make the connections as shown in

figure 1.

1. Strip about 10 mm of the insulation from the
wire. and then twist the core.

2. Push the knob on the terminal and insert the wire
into the terminal hole until the core cannot be
seen.

3. Release the knob and confirm that the wire is
connected properly.

3, Release

Fig 1

Be sure that the core wires don't touch each other.

POWER-HANDLING CAPACITY

The power-handling capacity of this unit is indi-
cated in the specifications. and is determined ac-
cording to the temperature increase of the voice
coils.

s it the amplifier to be used has an output power
which exceeds the power-handling capaCity of
this unit. be sure that the amplifier's volume con-
frol is set so that excessive input is not applied to
the speaker system.

s Even if the amplifier to be used has an output
power which is less than the power-handling
capacity of this unit. the output of the amplifier
will become distorted and excessive input Will be
applied to the speaker units. especially for the
middle and high frequencies. 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 sys-
tems if the tone controls of an amplifier or a fre-
quency 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 distorted.

s The power-handling capacity of this unit is set for
reproduction of ordinary music. if an oscillator or
test record is used to produce a continuous signal
such as a sine wave. etc.. a signal exceeding 2
watts must never be applied.

0 Usually. 1 watt of sine wave is encugh to test a
speaker system when an oscillator or test disc is
used.

0 if the following special types of signals are ap-

plied to the speaker system. be sure to reduce the

volume level of the amplifier.

lnterstation hiss on the FM broadcast band.

2. Output from a tape deck during fast forward or
rewind