Electro-Voice EVF-2121S, EVH-1152S, EVF-1152D, EVF-1122D, EVF-2151D

4.0 Preparing EVF and EVH Systems for Installation (cont’)

4.52Using the EVF-1121S and EVF-1151S Low-Frequency Systems in Full-Range Clusters that Operate on a Single Power-Amplifier Channel

The EVF-1121S and EVF-1151S low-frequency systems have integral passive low-pass filters that roll off frequencies above 100 Hz at the rate of 12 dB per octave. This means that these systems can be used to augment the low-frequency output of the EVF-1122/XX and EVF-1152/XX full-range systems without the use of an external digital signal processor (DSP) for crossover from the low-frequency to the full-range systems. As many as two full-range systems can be paralleled with an EVF low-frequency system on a single power-amplifier channel capable of driving a 2.1-ohm minimum impedance.

This simplified, cost-effective configuration is most appropriate for applications that require only moderate or moderately high acoustic output. This is because the full-range systems cannot have the full infrasonic protection provided by the high-pass filters specified in Table 3. However, useful overall cluster protection will be provided by employing the high-pass frequency recommended for the particular EVF low-frequen- cy system used.

Note that the EVF-1181S, EVF-2121S, and EVF-2151D do not incorporate a low-pass filter.

4.53 DSP (Digital Signal Processor) Loudspeaker Presets for Biamp Operation

In the biamp mode, the crossover and equalization must be achieved external to the loudspeaker. This is typically done with a digital signal processor (DSP) that has crossover and equalization filters that are adjusted by the manufacturer to provide the essentially flat frequency response mentioned above. The fac- tory presets for the EVF and EVH loudspeakers have been determined for Electro-Voice processors and are available for download at www.electrovoice.com. Presets for other popular processors often can be provided by the Bosch Communications Systems/Electro-Voice technical support group; specific contact information can be found at www.electrovoice.com.

By providing a single loudspeaker system with uniform frequency response, the loudspeaker presets are a good starting point for equalizing a cluster of systems during setup and commissioning. Final equalization of a cluster should be accomplished with additional equalization made in front of the DSP device, not by modifying the preset crossover and equalization parameters in the low- and high-frequency outputs of the DSP. The later is likely to produce undesirable frequency-response and directivity changes in the cross- over region.

22	Electro-Voice EVF/EVH User Manual

EVH-1152S, EVF-1152S, EVF-1122S, EVF-1122D, EVF-1152D specifications

Electro-Voice is renowned for its high-quality audio solutions, and the EVF series embodies this commitment. The EVF-2121S, EVF-1121S, EVF-1181S, EVF-1151S, and EVF-2151D are a collection of loudspeakers designed for a variety of professional audio applications, each with its distinctive features and capabilities that cater to different sound reinforcement needs.

The EVF-2121S is a dual-12-inch full-range speaker that combines exceptional power handling with a wide frequency response. It utilizes a coaxial driver arrangement, providing even sound distribution and a cohesive audio experience. This model is ideal for medium to large venues, offering a robust SPL (sound pressure level) output and clear reproduction of vocals and instruments.

In contrast, the EVF-1121S features a single 12-inch driver, delivering precise, high-impact sound suitable for smaller spaces. Its design emphasizes clarity and detail, making it perfect for live sound applications. The compact and lightweight design also ensures ease of transport and installation, appealing to mobile sound reinforcement professionals.

The EVF-1181S is a dedicated subwoofer that amplifies low frequencies, featuring an 18-inch woofer for deep, powerful bass response. Its extended low-frequency output enhances the overall sound experience, making it an ideal choice for high-energy music events and professional club environments. Designed with rugged construction and efficient power handling, the EVF-1181S is built to withstand demanding conditions while delivering reliable performance.

The EVF-1151S combines a 15-inch woofer with an advanced high-frequency driver for a full-range sound that works well in theatres, concert halls, and corporate events. The speaker ensures clear mid and high frequencies, maintaining vocal intelligibility even in challenging acoustic environments.

Lastly, the EVF-2151D is a dual 15-inch subwoofer that enhances overall system performance with its ability to produce deep bass. Its compact enclosure design allows for seamless integration into various sound setups, ensuring it can meet the needs of both portable and installed sound systems.

All models in the EVF series incorporate advanced technologies, including proprietary transducers and custom-engineered waveguides, which contribute to their impressive performance. With features like durable enclosures and efficient power handling, these loudspeakers are engineered to provide reliable sound reinforcement for both live and recorded applications. Whether it’s a concert, event, or installation project, the Electro-Voice EVF series stands out for its versatility and audio excellence.