NTi Audio Acoustilyzer AL1 - Manual (Page 49)

48 49
Delay Time
The setting of the acoustical propagation delay time from speaker to
speaker in e.g. churches or auditoriums, is required so the listening public
perceive the direction of speech as coming from the speaking person’s
actual position and not from the side or rear speakers.
The Acoustilyzer measures the delay time of the acoustic speaker signal
( using the built-in microphone) against the electrical line reference signal
(connected at RCA or XLR input). The delay time test signal that has to be
used is provided on the AL1 Test CD.
Converted
Delay Time in
meter/feet
Delay Time
Memory
Automatically calculated Delay Time
Store - Actual
Start Synchronization Synchronization Time Bar
100% = 100 seconds
Actual
measured
Delay Time
to Electrical
Reference
Signal
Status Indication
Synchronization: The automatic synchronization allows delay time
measurements without any connected electrical reference signal for
100 seconds and displays the time remaining until the next required
synchronization.
Manual Synchronization:
Initiate a manual synchronization by selecting SYNC.