Vienna Acoustics Principal Grand owner manual i.Crossover Control middle position, iii.Phase

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.