The 1.5 setting produces the "widest" effect from Trifield.

This is a very important parameter to get right and get the integration of the front 3 speakers. Set the depth of the centre first (by ear) to get the best integration/reinforcement of the bass in your setup. Set the width next listening for smooth transitions on panning sounds across the front. Generally, one setting "snaps" into place as correct. If you set too wide then the L/C/R speakers sound disjointed and location specific instruments from part left and part right sound strange.

Malcolm