EXAM: AVIXA CTS-D: PAG-NAG EXAM WITH SOLUTIONS
PAG CORRECT ANS-Potential Acoustic Gain
is the potential gain that can be delivered by the sound system without ringing and before
feedback occurs. It is based upon the number of open microphones, and the distances
between source(s) (like a pres...
EXAM: AVIXA CTS-D: PAG-NAG EXAM WITH SOLUTIONS
PAG CORRECT ANS-Potential Acoustic Gain
is the potential gain that can be delivered by the sound system without ringing and before
feedback occurs. It is based upon the number of open microphones, and the distances
between source(s) (like a presenter) and microphone(s), microphones to loudspeakers, and
listeners to loudspeakers.
NAG CORRECT ANS-Needed Acoustic Gain
is to determine how much gain is needed to deliver the same level of sound to all the listeners
in the space
Is the gain the sound system requires to achieve an equivalent acoustic level at the farthest
listener equal to what the nearest listener would hear without sound reinforcement
EAD, Equivalent Acoustic Distance CORRECT ANS-Is the farthest distance one can go from
the source without the need for sound amplification or reinforcement to maintain good
, EXAM: AVIXA CTS-D: PAG-NAG EXAM WITH SOLUTIONS
speech intelligibility. It is a design parameter dependent on the level of the presenter and the
noise level in the room
Excessive background noise level will cause this to decrease.
Rule of Thumb for EAD for Voice CORRECT ANS-4 ft (1.2 meters) is often a safe bet for
voice. This assumes a 25 dB acoustic signal-to-noise ratio
Gain CORRECT ANS-Refers to the electronic amplification of a signal.
NAG Formula CORRECT ANS-20 log (D0 / EAD)
in dB, and it indicates the amount of acoustical loss from the EAD position to the farthest
listener.
Where:
D0 = Distance from source to listener
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