Technics SBE 200 Service Manual

Page 2

I FEATURES

- High efficiency, high input resisting 30cm woofer
In order to make the most of the horn type speaker
system, the woofer is required to be highly efficient and to
have a frequency characteristic to go smoothly with the
mid-range. In this respect, the system uses Canadian
coniferous pulp and cones with liner elements combined,
thus assuring a high efficiency of 95dB/W(1.0m). Also. to

improve the linearity coping with a large input, well» .

ventilated high compliance dampers and non-directional
urethane edges are employed. Furthermore, polyester
insulator and polyamide layers are used for the voice coils,
and extra-high heat resisting resin film is used for the
bobbins so that the system is able to withstand continuous
since waves of as high as 100 Watts (DIN RMS).

- Wide-directional radial horn mid-range

Frequency characteristics with wide-band and excellent
directivity are obtained with a radial horn widening at 150
deg. from aluminum die-cast horn throat and newly
developed shell type equalizer (midrange). The driver
section is made of extra-thin aluminum alloy of 35f, 30pm
thick, and the edge, provided with slits, employs perforated
pole pieces to improve the low-range characteristic, and is
high input resisting with heat radiating aluminum bobbin of
pm, CCAW (copper coated aluminum wire), and heat resist-
ing voice coils

. Wide-directional radial horn tweeter

This wide-directional radial horn, widening at 150 deg., is
of high precision solid type made of aluminum diecast.

The driver section consists of metalized polyester film
vibrating reeds and employs a powerful magnetic circuit
using a large aluminum magnet, and is high input resisting
with use of heat resisting voice coils.

Linear phase network
Linear phase characteristics are obtained by a dividing

network combining 12 dB/oct and inductive M types, thus
making reliable transfer of waves possible.

Also, low-distortion filament cores are employed for choke
coils.

Control tower

It is equiped with a thermal relay protection circuit in order
to protect the mid-range and tweeter from excess input or
abnormal signals. Also, to use it as a multiamp system, it
is provided with multi-amp input terminal along with a
multi-amp switching connector. Besides these functions,
dividing network, level control and input terminal are con-
centrated at the control tower which also serves to secure
drivers of the mid-range and tweeter, thus improving the
controllability.

I POWER HANDLING CAPACITY

The power handling capacity of this speaker system is 150

watts (music), and 100 watts DIN (RMS).

if the following special types of signals are applied to the

speaker system, be sure to reduce the volume level of the

amplifier.

1. Interstation hiss on the FM broadcast band

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

3. Acoustic feedback from a microhpone or an electric
musical instrument.

4. Shock" nOIse which occurs when the power switch of
amplifier, etc, is turned on or off, when input or output
connection cords are connected or disconnected. or when
a phono cartridge is replaced

Use the speaker system with care to avoid damage by any

of the above

. Keep the speaker system away from heating appliances
or other sources of heat, and do not expose it to direct
sunlight or excessive moisture.

- Do not instaii the speaker system near a TV set. because
the image of the TV set may be disturbed by the
magnets used in this speaker unit.

- Never use a chemically-treated cloth, alcohol, thinner,
benzine, insecticide or other volatile chemicals to clean
the cabinet because to do so may damage the luster of its
fine finish.