Monitor Systems.

Up to this point all that has been covered are main or house systems. A discussion of "monitor " or "fold-back" systems is in order. In its simplest form you can send a signal from the main mix to your monitor. One way to do this is shown in Figure 19.

A mixer (for example TAPCO 6000-CF) is used to deliver a signal to one half of a CP120 for the main system and one half of the CPl2O for an FMl2-2 floor monitor. To go farther than this, some mixers such as the TAPCO 6000-R or the 6001-RB provide a separate "monitor send" output. This enables you to make a special "monitor mix" such as vocals only, etc. With this more sophisticated monitor system, the FMl2-2 and FM12-3 can be used in a configuration such as the system shown in Figures 16, 17, and 18. The E-V FM-type floor monitors can be physically placed in four configurations as necessary for your application on stage, as shown in Figure 20.

Some Thoughts on Permanent Installation Systems.

In most cases where a temporary sound system is used, the system is stacked on either side of the stage such as the systems shown so far. This usually cannot be avoided by the one-time operation of most groups, but it does have some problems. It blocks the view of some listeners and it causes interference of sound waves in the room because sound is coming from two points separated by a large distance. One somewhat more refined solution is to make one central cluster such as the one shown in Figures 21 and 22.

This is another way to supply sound to the 90,000 cubic foot room previously described. This would be a desirable way of installing a permanent system, but it becomes fairly complex for the touring group. With the central cluster suspended, the horns can be aimed to obtain even coverage over the whole room. In a permanent installation, the large HR horns may be a desirable component to use. The large HR horns (HR9040, HR6040, and HR4020) offer reasonably tight vertical control starting at 800 Hz, whereas the small HR horns (HRl2O, HR90, HR60, and HR40) offer tight control starting at 1500Hz. The large HR horns will, therefore, have better controlled coverage at tower frequencies and produce less reverberant energy than their smaller counterparts. They are the most desirable horn for a highly refined system when their increased size is acceptable Bass systems such as those in the Electro -Voice be employed in permanent systems because the need for roadable enclosure construction can be eliminated In this system two TL6O6D S are used to match the HR4020 and HR904O. This system will not have the same maximum acoustic output ability as the two stack system shown earlier in Figures 16 and 17. However it will only be 3dB less overall.