Manual Samson RSX18A (page 12 of 68) (English, German, French, Italian, Spanish)

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Phase and Polarity

A speaker reproduces sound by converting electrical signal into physical vibration. This

physical vibration, in turn, pushes air to create sound waves. When setting up your

speaker system, the goal is to have all speakers moving in phase, with the in and out

movement of the speakers synchronized.

This produces an even sound across all

audible frequencies. If the subwoofer is

out of phase with the full range front of

house speakers, you may notice decreased

bass response, or even bass frequency

cancellation where satellite and subwoofer

frequency responses overlap. Many times

this phenomenon is very subtle, but it can

produce the effect of “holes” in the music,

and diminished bass frequencies.

Ideally, your RSX18A subwoofer should be positioned on the same plane as your

satellite speakers. In reality, we know this is difﬁcult, as there are restrictions when

setting up a PA system due to space limitations, speaker stand conﬁguration, or even

speaker cabinet shape. To compensate for these obstacles, the RSX18A features a

Phase switch, which allows you to reverse the polarity of the subwoofer relative to the

source signal. This enables you to put the RSX18A in phase with the rest of your PA

system, or 180° out of phase.

To determine if the audio produced by your RSX18A is in phase with the rest of your PA

system, play an audio track containing a lot of bass frequencies through your speaker

system. Stand at a good listening distance, where you can clearly hear the audio from

the subwoofer(s) and mains speaker(s), and listen until you believe you have a good

gauge of the level of bass frequencies. Press the Phase switch on the RSX18A to reverse

the phase by 180°, and move back to your original listening position (if possible, have

someone else press the Phase switch so that you can stand in the exact same location).

Compare the overall level of the bass frequencies between the two settings. The correct

setting will result in more bass frequencies. If the situation allows, you can ﬁne-tune

the phase of your RSX18A to your satellite speakers by moving the relative position of

the subwoofer closer or further away from the listening position.

Time

Amplitude

0° 90° 180° 270° 360°

Phase SW = NORMAL

Phase SW = INVERT

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Samson RSX18A Manual

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