The Electro-Voice Sx300 is a 300-watt, 12-inch two-way, high-efficiency, constant-directivity compact speaker system with Ring-Mode Decoupling (RMDTM).
Through the extensive use of computer-aided design and modeling, Electro-Voice engineers have developed a state-of-the-art professional loudspeaker system.
The high-frequency section of the Sx300 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 addition, the coverage pattern is unusually uniform over its range of operation.
Sound quality 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, VaripathTM 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 Sx300 is the cabinet. Constructed of highimpact polypropylene structural foam, it provides a stiff and extremely durable enclosure. Molded into the cabinet are an integral 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 characteristics, make the Sx300 ideal for use alone or in arrays.
In situations requiring additional bass output, the Sx300 can be used in combination with the Electro-Voice Xp200A system controller.
The Xp200A includes a low-frequency enhancement circuit that is tailored to match the low-frequency characteristics of the Sx300. Up to 12 dB of additional bass output can be obtained from the system when used with the Xp200A system controller. The amount of low-frequency enhancement can be adjusted to suit the user’s personal preference.
For the most demanding situations, two bassmodule models are available to complement the Sx300: the Electro-Voice Sb121 nonpowered bass module and the Electro-Voice Sb121a powered bass module. Both bass modules were designed to be used with the Sx300 and are constructed in similar structural foam enclosures. The Sb121a includes a 300-watt power amplifier that is built into the speaker cabinet. The Xp200A system controller provides a subwoofer output that is a crossed-over sum of the left and right channels.
The Sx300’s high-frequency horn is driven by the DH2010A one-inch-throat, widebandwidth, titanium-diaphragm driver. The DH2010A uses a unique, convex-drive Time PathTM phasing plug structure (U.S. Patent #4,525,604) for smooth and extended high-frequency performance. The voice coil is coupled to the diaphragm with EV’s exclusive Resonant DriveTM technology. This increases and smooths the highfrequency response and reduces the amount of internal equalization required for flat frequency response. Driver output extends to 25,000 Hz. A self-resetting high-frequency protection circuit, EV’s PROTM circuit, is included with the Sx300 to prevent against accidental overdrive and improve system reliability. If the input power to the high-frequency driver exceeds the nominal rating, the protection circuit is activated and reduces the power delivered to the driver by 6 dB. The system will remain in this mode of operation until the input power is reduced to a safe level.
The bass section of the Sx300 is designed using Thiele-Small parameters for efficient performance to below 80 Hz. The woofer is a DL12Sx 12-inch Pro-Line unit featuring beryllium copper lead wires, a low-mass, edge-wound voice coil and high- emperature materials.
The system combines professional-quality components, arranged in a time-coherent vertical array, with an unusually durable Thiele-Small-aligned vented enclosure. The result is clear and articulate, high-quality sound.