Using Power Taps - Community VERIS 2 Operation Manual

Typical Input Panel for Autoformer Equipped Models
PIN DESIGNATIONS
The pin designation is as follows:
 'C' (meaning 'Common') connects to the 'C' or Ground connection on the
amplifier (typically a black binding post, or the 1- pin of an NL4 type connector).
 The selected tap connects to the positive output of the amplifier (typically a red
binding post, or 1+ on an NL4 type connector).

USING POWER TAPS

A VERIS 2 loudspeaker equipped with an optional autoformer has four 70.7V taps and three
100V taps. The 70.7 volt taps are set at 25W, 50W, 100W and 200W on the two larger
models, and 12.5W, 25W, 50W and 100W on the two smaller models. The 100V taps are set
at 50W, 100W and 200W on the two larger models, and 25W, 50W, and 100W on the two
smaller models.
By choosing one of the taps, you can govern how much amplifier power is available for each
loudspeaker. For example, if the 50W tap is selected, that particular loudspeaker will draw 50
watts of power when a 70V amplifier is run at its maximum level. A second loudspeaker might
be connected to the same amplifier, but tapped at 100W. In such case the second loudspeaker
will draw 100 watts from the same amplifier, making it 3 dB louder than the first loudspeaker.
A third loudspeaker might be tapped at 200 watts, which would make it 3 dB louder than the
second loudspeaker, and 6 dB louder than the first.
By using the various taps, the installer can balance the relative sound levels in a system.
A loudspeaker that is closer to audience members will need to be tapped at a lower wattage
than one that is farther away, in order to produce similar sound levels.
Typically, every time you double the distance from a sound source, the level drops by 6 dB,
which is equivalent to one-fourth of the power. Although this is an acoustical law, and is true
in a free space environment such as outdoors, the effect of room acoustics can (and usually
will) change the actual results. Even outdoors, it is normally not possible to validate this
acoustical law using a sound level meter, due to the ground plane effect.
That said, the use of pink or white noise to excite the system, and a sound level meter to take
nearfield measurements, will help the installer to precisely balance the relative level of each
loudspeaker in a sound system. Just make sure to take your readings at an identical distance
from each of the loudspeakers in the system, otherwise the results will be skewed.
VERIS 2 – Operation Manual - Page 17