Description
The Electro-Voice Sx300a is an amplified,
300-watt continuous, 600-watt dynamic,
12-inch, two-way, high-efficiency, constant-
directivity compact speaker system. The
Sx300a’s internal power amplifier includes a
clip-free limiter that monitors the woofer and
compression driver separately, maintaining
spectral balance at any listening level. Exten-
sive headroom brings a good match to the
speaker capabilities, producing a great-sound-
ing system in a very light weight package.
The active analog processing found on board
the Sx300a acts to provide individual com-
ponent protection for both the woofer and
compression driver in the system. The attack
time and compression ratio of the processor
are continuously variable and are a function
of the amplitude and time duration of the
musical signals being applied to the input of
the Sx300a. For short duration signals, the
Sx300a has an output capacity exceeding
600 watts. As the amplitude or duration of
the signal increases, the analog processing
acts to reduce the input drive to the power
amplifier section. The nominal 4-ohm im-
pedance of the low-frequency section of the
Sx300a will continue to allow the amplifier
to produce a power level of over 300 watts
with a signal of 500 millisecond duration.
When amplitude or duration levels exceed
preset levels, the analog processing functions
will further reduce power levels. The high-
frequency section of the Sx300a utilizes a
molded-in, 65° x 65° constant-directivity
horn. This unique pattern contributes to high
intelligibility. Vocals sound natural yet “cut
through” in reverberant, noisy rooms. In ad-
dition, the coverage pattern is unusually uni-
form over its range of operation. Sound qual-
ity off axis is very well maintained, even at
45° off axis (a 90° total coverage angle), well
beyond the rated coverage angle. The horn’s
unique, Varipath
TM
throat geometry helps
direct driver output to the corners of the
room, points of coverage not described in
the usual specifications of horizontal and
vertical coverage angles, and parts of the
audience that typically do not receive the
strongest coverage.
One of the many other unique features of
the Sx300a is the cabinet. Constructed of
high-impact polypropylene structural foam,
it provides a stiff and extremely durable en-
closure. Molded into the cabinet are an inte-
gral carrying handle and a stand socket for
mounting on 1
3
/
8
-inch stands such as the
Electro-Voice 100BK. Rubber feet that are
attached to the bottom of the cabinet and
mating sockets that are molded into the top
provide a means of stacking systems. The
trapezoidal-shaped cabinet, in combination
with the uniform, 65° x 65° directivity char-
acteristics, make the Sx300a ideal for use
alone or in arrays.
In situations requiring additional bass out-
put, the Sx300a can be used in combination
with the Electro-Voice Xp200A system con-
troller. The Xp200A includes a low-fre-
quency enhancement circuit that is tailored
to match the low-frequency characteristics
of the Sx300a. Up to 12 dB of additional
bass output can be obtained from the system
when used with the Xp200A system control-
ler. The amount of low-frequency enhance-
ment can be adjusted to suit the user’s per-
sonal preference.
For the most demanding situations, two
bass-module models are available to
complement the Sx300a: the Electro-Voice
Sb121 nonpowered bass module and the
Electro-Voice Sb121a powered bass mod-
ule. Both bass modules were designed to be
used with the Sx300a and are constructed in
similar structural foam enclosures. The
Sb121a includes a 300-watt power amplifier
300-Watt Powered
Two-Way Compact
Speaker System
• Internal, 300-watt continuous, 600-watt
dynamic power amplifier—includes
active analog processing
• Fully balanced input with switchable
crossover at 125 Hz
• Ring-Mode Decoupling (RMD
TM
) for
increased intelligibility
• Durable structural-foam enclosure with
integral handles and stand mount
• DL12Sx 12-inch woofer and DH2010A
compression driver for great sound and
reliable performance
• Molded-in constant-directivity 65° x 65°
high-frequency horn
• Stand mountable and arrayable
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