Issue link: https://www.e-digitaleditions.com/i/1327492
54 I ICT TODAY Four speakers, 9 feet and 6 inches, can be placed center-to- center to provide maximum overlap while also covering the entire room for when the listeners are mobile or are entering or leaving the room. It is important to note that the speaker layout is not centered on the room but is centered on the array of seated listeners (Figure 11). Step 7: Recall that in the example room layout—which is 26 feet wide by 20 feet deep—the calculated speaker coverage or conic section is 19.0 feet. For maximum overlap, the speakers have 50 percent overlap, and the distance between speakers should be 50 percent of the conic section or 9 feet and 6 inches (2.9 m). 9' 6" 9' 6" WHAT ARE THE OPTIONS FOR SPEAKERS AND AMPLIFIERS ? Top Tip: Once this math is completed, it becomes simple in the future to apply the speaker coverage maps to future projects with similar ceiling heights. FIGURE 11: Example of speaker overlap for a training room. There are generally two options for speakers and sound amplification.The first is a low impedance option utilizing 4-or 8-ohm speakers for stereo sound, typically in smaller focused spaces in the home or individual office where the effect of stereo left and right channels can be fully realized. Attempting to install stereo sound in a classroom or conference room is not recommended. This is because stereo sound separates the sound's signal into left and right channels. Thus, in a classroom or conference room setting, the individuals seated at the left side of the room will only hear the left channel portion of the sound and those seated on the right will only get the right channel. Therefore, while stereo is great for a home theater or individual space, it is not a good solution for distributing the full audio signal evenly throughout a room. These applications are better served with mono sound from two low impedance 4-or 8-ohm amplifiers. When using to distribute sound over a large space, consider a high impedance 70 volt speaker system. Stereo and 70 volt amplifiers come in many variations, but a common and useful configuration is a mixing amplifier. A mixing amplifier can take in multiple inputs and mix them together to enable applications, such as the addition of microphone input for paging over background music or for teacher annotation while students are viewing a video or presentation. While it is also common to install as separate components, most integrated mixing amplifiers provide for presetting the various input levels so that the listening level is appropriate when the additional input is added.