Radial Engineering Ltd. Headlight™ User Guide
9
ADJUSTING THE PHASE
Another important feature on the Headlight is the 180º polarity reverse switch that is found on outputs
2, 3 and 4. This is used to reverse the polarity of the amp that is connected as a means to bring all of
your amps into the same absolute phase. In other words, when all your amps are in phase, all of the
speakers are pushing forward when played together.
When using only one amp at a time, you will probably not notice if your amps are in or out of phase
with each other as phase cancellation is most audible when two amps are on at the same time. How-
ever, when more than one amp is on, certain frequencies will either combine and get louder when ‘in
phase’ or cancel out when ‘out of phase’ and sound distant.
The easiest way to test for phase is to face your two amps together and listen. If the sound is weak
or distant in the bass region, the amps are likely out of phase. Using output-1 as the reference, try
toggling the output-2 180º polarity reverse switch to compare. If using more than 2 outputs, repeat the
process with each subsequent amp – always using output-1 as the reference.
OUTPUT-1 OUTPUT-2
Pol in 180
º (UP)
position to correct phase
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