Electro-Voice Premium Surface Mount Speakers manual How large an area can an EVID system cover?

What general guidelines do I consider when deciding on the physical placement of the EVID 12.1 subwoofer?

It is often desirable to place the subwoofer in the middle of the room to get the most uniform coverage. Even though a subwoofer projects sound omni directionally and that the sound is generally not localizable, there is still a reduction in subwoofer sound level the farther away one gets from the subwoofers installed location. Placement in the middle of a room however lowers the sensitivity and ultimate maximum SPL of the subwoofer. You can also use additional subwoofers in order to attain more even coverage. To get good SPL levels, it might be necessary in some applications to install the 12.1 subwoofer along a wall or in a corner.

What typical subwoofer/satellite system configurations are possible?

The EVID Series contains a variety of models, allowing great flexibility to configure a system to fit the requirements of many different applications. Some typical examples are illustrated at the end of this guide

How large an area can an EVID system cover?

A system consisting of one 12.1 subwoofer and four 4.2 or 6.2 satellites can cover up to a 4000 square foot room with balanced, even coverage. The estimate of 4000 square feet is a typical coverage area. You can scale the coverage up or down to adjust for applications with different SPL requirements and different size rooms.

What are general wiring/electrical guidelines when assembling complete EVID systems with a subwoofer?

Because the 12.1’s crossover network does a good job of separating the low-pass and high-pass frequency bands you can usually consider the impedance in each band as being nearly separate from each other. The crossover frequency is set for the ideal 160 Hz acoustic crossover point with a 4-ohm load on each satellite output. It is best to use a 4- ohm load on each satellite output when possible. Increasing the impedance of the satellites on a satellite outputs lowers the crossover frequency to the satellites, resulting in more overlap between the subwoofer and the satellite. Using an 8-ohm load on each satellite output results in operating the satellite down to 80 Hz. With the subwoofer operating up to 160 Hz, this could result in a frequency response bump between 80 Hz and 160 Hz, where both subs and satellites are operating. This is a situation to be aware of when placing the speakers in the room.

What is the best way to connect the EVID 12.1 for single channel operation?

To operate a 12.1 subwoofer in mono, parallel the two subwoofer inputs, resulting in a 4Ω load in the subwoofer range, below 160 Hz. When hooking an EVID 12.1 in mono IT IS VERY IMPORTANT TO MAKE SURE THAT BOTH INPUTS ARE CONNECTED IN PROPER POLARITY.

EVID Design and Installation Manual Page 6