Front Panel Controls - Shure HTSSOSPA Manual

RISK OF ELECTRIC SHOCK
A m A
CAUTION.
TO REOUCE THE RISK OF ELECTRIC SHOCK
DO NOT REMOVE COVER
NO USER SERVICEABLE PARTS INSIDE
REFER SERVICING TO O U A L F I E D SERVICE PERSONNEL
The llghtnrng flash w ~ t h
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 c u d . 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. ' l his 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
f i l m
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