NTi Audio XL2 Sound Level Meter - Manual (Page 89)

89
Polarity
Polarity Measurement - Getting Started
For acoustic polarity measurement you can use the internal
voice note microphone, or an external measurement micro-
phone, plugged into the XLR input. The polarity result for left
and right speaker cabinets should match for a good stereo
sound image.
Feed the speaker cabinet with the polarity test signal of the •
Minirator.
Adjust the test level (at Minirator or amplifier) until the test
•
signal is clearly heard.
Enable the polarity test signal at the left speaker cabinet;
•
mute the right speaker cabinet.
To activate the internal microphone, select
• Signal Source
with the rotary wheel and choose Voice Note Mic with
enter .
Measure the polarity of the left speaker cabinet and save the
•
screenshot in the memory menu .
Enable the polarity test signal at the right speaker cabinet; •
mute the left speaker cabinet.
Measure the polarity of the right speaker cabinet.
•
Compare the polarity test result of both speaker cabinets. •

The polarity measurement is completed.
The sample result shows the polarity as:
Sub-woofer: Low energy, no sub installed •
Woofer: Positive •
Mid-range: Negative •
Tweeter: Positive (with small levels) •
The major part of the signal energy is measured
in the mid-range frequency bands. Therefore
the overall displayed polarity is NEGATIVE.