TKA SP-C61T, Руководство по установке

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7
Adjust the Tap Settings
The SP-C61T speakers have the following tap settings available:
70V: 3.75W, 7.5W, 15W, 30W
8Ω (bypasses the internal transformer)
The tap settings will affect the overall volume of the loudspeaker in the system. When
designing a 70V system, care must be taken not to exceed the power rating of the
amplifier or dangerous clipping may occur. Clipping is the most common cause of
damage to loudspeakers and should be avoided at all times.
The standard rule is to design a system that leav
es 20% of the amplifier’s rated power
as a reserve. For example, with a 300-watt amplifier, speakers should never be set
with taps that total higher than 240-watts. The amplifiers total load is determined by
adding the wattage of each speaker. When thicker wire or exceptionally long wire runs
are used, there is an additional component of current loss due to the cable that can
become significant and must be considered in the calculation. For our example with a
300-watt amplifier, here are the approximate number of speakers that could be used if
each speaker used the following tap settings:
Example: 300-Watt Amplifier (saving 20% for overhead, means 240 usable watts maximum)
Tap Settings and maximum number of speakers (depending on wire gauge and length)
3.75W : Max of 56-64 speakers
7.5W : Max of 28-32 speakers
15W : Max of 14-16 speakers
30W : Max of 7-8 speakers
For a 70V system, most installations are designed to blanket an area using more
loudspeakers at a lower tap setting rather than using fewer speakers at a higher tap
setting. This is done to avoid hot spots where very loud sound is heard in certain
areas and less in others. It is much more common for 70V speakers to be set at their
lowest tap setting than at their highest, but each installation may require adjustments
due to the application or environment.
You can adjust the tap setting at any time by turning the tap setting knob to the new
position, but make sure not to exceed
the amplifier’s total available wattage when
doing so.