If you use multi-mono compression for example, you're actually making the signal less stereo. However, you are shifting the center image every time there is gain reduction. Whether that sounds wider or not would be pretty subjective and dependent on the scenario and program material I would imagineInstead of using stereo plug ins on stereo sources, use multiple mono instead. Especially with compressors, the difference in sound on either side contributes to the perceived wideness.
Also, beware of using different guitar tones per side. Sure, it can make your mix wider, but if you get a listener like me who can't handle mix asymmetry, then you'll make them want to murder you.
I'm one with the same rigs EQ'd differently on either side. Same filters on a bus, cutting off lows and super highs,
Try nailing the basics. Often if you get your instrument balances, panning, compression and 'wet' FX right you'll have a mix that sounds quite wide without any trickery.
Beyond that, things that throw around the consistency of the image can help, like analogue compressors, unlinked compressors (use sparingly), console/tape saturation and (last resort) artificial stereo widening.
Also, beware of using different guitar tones per side. Sure, it can make your mix wider, but if you get a listener like me who can't handle mix asymmetry, then you'll make them want to murder you.
Also, beware of using different guitar tones per side. Sure, it can make your mix wider, but if you get a listener like me who can't handle mix asymmetry, then you'll make them want to murder you.