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RISK OF ELECTRIC SHOCK
AmA
CAUTION.
TO REOUCE
THE
RISK
OF
ELECTRIC SHOCK
DO NOT REMOVE COVER
NO USER SERVICEABLE PARTS
INSIDE
REFER SERVICING TO OUALFIED SERVICE PERSONNEL
The llghtnrng flash w~th
arrowhead symbol, wlthln an
equilateral
triangle,
IS
rn-
tended to alert the user to
the presence of
un~nsulated
"dangerous voltage" wlthtn
the product's enclosure that
may be of
sufflcrent magnt-
tude to constitute a risk of
electrlc shock to persons
The exclamation point
within an equilateral trangle
is intended to alert the user
to the presence of important
operating and maintenance
(servicing) instructions in
the literature accompanying
the appliance.
attached at the output terminals.
In
addition, the amplifier features a clipping
protection
cud.
This
circuit does not add
distortion to the signal,
as
do ordmry "soft
clipping" circuits.
Instead,
it reduces the
gain
of
the amplifier only when necessary to
avoid long
term hard clipping.
'lhis
circuit
can
be
selectively disabled by pressing the Protection
Defeat switch for
each
channel desired.
The slotted control
knobs on the HTS5OSPA
are intended to require insertion of a coin to
change their
settings. These knobs resist
accidental changes of position.
Two
LED'S
on the front panel illuminate to
indicate the presence of an audio signal, and
either operation of the protection circuit or
clipping. Power on
is
indicated by the
illuminated power button.
Amplifier
Architectme
To interface with the outside world, the
amplifier input connectors are gold-plated
RCA
type
phono
@;
output connectors are gold-
plated five-way bin@
posts
suitable for use
with most
high-performance
audio cables.
To receive and generate signals at the
input
and output connectors respectively, scrupulous
care
has
been exercised
in
design and construc-
tion of the
HTS5OSPA with highest quality
components used throughout. The power
amplifier circuit of each channel uses a hybrid
audio power module construction.
This
compact
assembly
techque combines semiconductor
chips, normally used in amplifiers
as
separate
dwrete devices, into a tightly coupled unit on
a
multilayer high-thermal-conductivity substrate.
The
high
thermal conductivity of the base
substrate results in a close thermal match of the
amplifier output circuits to the voltage and
current
gain
driver stages. Each discrete device
now tracks the other dependent on power
dissipation in the output stage.
This
is
not
possible
with
the discrete separated parts using
normal amplifier construction.
Thus
the
HTSSOSPA takes advantage of one of the benefi&
of monolithic integrated circuits while still
retaining a discrete component topology
as
part
of the hybrid amplifier module. The total
amplifier circuit combines the hybrid module
and special control circuitry to deliver high
current and voltage with low distortion and
precise control of the amplifier circuit in
overload conditions. The output amplifiers in
each channel are complemented by signal
processing circuits which match amplifier
operation to the HTS loudspeakers. The total
combines low noise
FET operational amplifiers,
high
quality small signal capacitors and resistors,
multiple computer grade power supply
capacitors,
glass
epoxy
circuit
boards,
and a
high
current low noise, instrumentation grade
toroidal power transformer.
The result of these circuitry techniques
is
an
amplifier of exacting specifications, precisely
processing the input signal and accurately
matching
HTS5O Series Loudspeakers to produce
many years of enjoyment of the
finest
film
and
music sound stages.
HTSSOSPA
FRONT
PANEL
CONTROLS
@
LWEL:
For
both
Channel
1
and Channel
2,
the normal position for the Level
control
is
0 (no attenuation for
all
loud-
speakers.)
In
the HTS Theater Reference
System, total Volume level and Surround
level are controlled at the HTS Decoder
or its Remote Control.
In
certain
cases,
other level settings
can
also
be
recommended
1.
To compensate for room variations,
see the Balance and Phasing section
of the
HTS5300 Manual for specific
instructions.
2.
For a more visceral low end in
theatrical presentations, either
turn
all
level controls to -3 except for the
HTSSOSW Subwoofer or
turn
all
levels controls to
-6
except for the
Subwoofer.
In
both setups, leave the
Subwoofer channel level conml at
0.
The additional ultra-lowfrequency