NTi Audio XL2 Sound Level Meter - Manual (Page 93)

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Delay Time
Wait until the XL2 synchronizes to the incoming delay test •
signal, then the synchronization time bar fills up.
Disconnect the audio cable, with the synchronizing signal, •
from the XL2, allowing you to move around freely for the
delay measurement. When selecting Minirator as the delay
signal source, the XL2 has to be synchronized to the signal
source again after 5 minutes. When selecting CD Player as
the delay signal source, the XL2 has to be synchronized to
the signal source every 100 seconds.
Measure Reference Speaker A
Start the delay test signal at speaker A, mute speaker B. •
Position yourself with the XL2 at the measurement position •
next to speaker B sub left as indicated above. This is the
worst-case position in the auditorium with regard to acoustic
delay in the sound field. The XL2 uses the VoiceNote micro-
phone for the delay test; do not connect any measurement
microphone.

The XL2 measures the delay time of speaker A in reference
to the electrical input signal in milliseconds.