STI-PA Testing Using an acoustical test source for STI-PA measurements provides two major advantages: An extended test coverage and an easy to handle test signal injection. Sampling frequency deviations - a dangerous trap when using portable CD players - are completely eliminated.

One, Two, Test When setting up microphones for reinforcement or conference systems, a human speaker commonly repeats the familiar phrases "one, two, test" or "check - check" to stimulate the system and check for level. The NTI TalkBox simplifies and improves this method. For basic adjustments, the reference human speech signal makes this task easy for one person. For more precise work, e.g. in teleconference applications, also the system flatness and response effects can be determined.