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6. After the Principal Grand subwoofer is fully broken
in, it may be necessary for you to make some final,
minor adjustments to the crossover and overall gain
settings.
Start with the controls in the following positions:
i. Crossover Control: middle position
ii. Volume: start in the middle position
iii. Phase: 0°
6. Listen: It is important that you listen to music
while making the final proper adjustments to the
Principal Grand. Start with a piece of music that has
an abun-dance of consistent and rhythmic low bass. A
recording with a plucked double-bass properly
recorded should work quite well for this process.
a. Volume: Make necessary adjustments so that the
volume of the subwoofer is similar to that of the main
loudspeakers. It is possible that you will have to turn
the Principal Grand´s gain control to near maximum.
The choice of operating range of this special gain
control we have used was determined by obtaining the
best possible sound quality.
b. Phase: While listening to music, switch the Phase-
Control between 0° and 180°. Select the position that
offers the greatest overall bass output – this is the
position that the Principal Grand subwoofer is working
in time or in-phase with your main loudspeakers.