Electro-Voice Sx300a User Manual

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

Electro-Voice Sx300a Specifications

General

Frequency Response (-3 dB)	65 Hz - 18 kHz
Frequency Response (-10 dB)	55 Hz - 20 kHz
Frequency Response	55 Hz - 20 kHz
Power Handling (Continuous)	300 W
Power Handling (Program)	600 W
Power Handling (Peak)	1200 W
Maximum SPL	126 dB
Max. SPL/1m (calc)	126 dB
Nominal Impedance	8 Ohms
Coverage (Nominal -6 dB) H°	90°
Coverage (Nominal -6 dB) V°	60°
Crossover Frequency	2 kHz
Input Connectors	Dual NL4 Speakon
Enclosure Material	Plywood
Width	394 mm (15.5 in)
Depth	394 mm (15.5 in)
Weight	23.6 kg (52 lbs)
Type	2-way, full-range loudspeaker system
Minimum Impedance	6.4 ohms
Coverage Pattern	90° x 60°
LF Transducer	12" woofer
Low Frequency Driver	12" woofer
HF Transducer	1.5" titanium diaphragm compression driver
High Frequency Driver	1.5" titanium diaphragm compression driver
Height	610 mm (24 in)

Summary

Product Description and Features

Description

Detailed explanation of the Electro-Voice Sx300a amplified speaker system, highlighting its components and capabilities.

Key Features

Highlights the main features like 300-watt amplifier, RMDM, durable enclosure, and specific driver details.

Ring-Mode Decoupling (RMDM)

Explains how RMDM technology enhances sound intelligibility by controlling resonance.

Constant-Directivity Horn

Describes the 65° x 65° constant-directivity horn for uniform audience coverage and intelligibility.

Varipath™ Throat Geometry

Details the Varipath™ throat geometry that directs sound to room corners for better coverage.

Durable Structural-Foam Enclosure

Highlights the high-impact polypropylene structural foam cabinet for durability and integral features.

Operation and Installation Guide

Precautions

Provides essential safety precautions for connecting, operating, and maintaining the Sx300a to prevent damage or shock.

Signal Input

Explains how to connect various line-level signal sources, both balanced and unbalanced, to the Sx300a.

Amplifier Controls and Indicators

Describes the minimal controls on the amplifier, including the system gain control, and power indicator.

Ventilation

Explains the importance of proper ventilation for the amplifier's heat sink and the required clearance.

Electronic Crossover

Details the built-in fourth-order, 24-dB-per-octave electronic crossover operating at 125 Hz.

Suspending Sx300a Enclosures

Provides warnings and recommendations for safely suspending the Sx300a using specific mounting hardware.

Warranty and Service Information

Uniform Limited Warranty

Outlines the limited warranty period, exclusions, limitations, and procedures for obtaining service.

Service and Repair Address

Provides the official service and repair address and contact phone numbers for Electro-Voice.

Detailed System Specifications

Specifications - System

Lists detailed system specifications including frequency response, SPL, dispersion, distortion, and dimensions.

Specifications - Amplifier

Details amplifier specifications such as output power, frequency response, THD, input sensitivity, and impedance.