Legacy Audio Metro - Manual (Page 15)

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15
Fine Tuning
Phase (0 °/-180 °): This control is essential in the proper setup of your subwoofer. If
not set up properly, your main speakers and subwoofer can actually work against each
other. If operating out-of- phase the subwoofer and mains will cancel, creating nulls at
some frequencies (primarily upper bass).What is desirable is to have the subwoofer
and the mains operating in phase, relative to the primary listening position. Here is an
effective method of accomplishing this:
While seated at your listening position, have someone sweep the phase control slowly
from one extreme to the other.
Using pink noise or a 50-60 Hz test tone, listen for the strongest output. Now take note
of that setting. Next, play music program material and optimize the level and phase
settings further; adjusting for the smoothest output.