Shal,
The stereo sound localization very much depends on the CD that you're playing. When I listen to Diana Krall: Love Scenes for example, she is dead centre between my 80s and her bassist is a touch to the left. But when I play Echoes of Incas: Ventana Al Sol, there are sound cues at the centre, to the left and right of centre, at the left and right speaker and even cues well beyond the speaker boundaries including behind me to the left and right sides.
Start with an equilateral triangle and keep moving your fronts closer together from there. And leave them where it sounds best to you.
