My experience is that anything that obscures low level detail will reduce soundstaging. After all, it is the low level detail that creates the soundstaging effect. All components in a system will obscure detail to some extent, so more revealing gear all around will improve soundstaging.
Another crucial aspect is vibration control. If you are using the stock rubber feet that come on most gear, this will obscure low level detail. Switching to cones and other such footers will make a big difference.
Another crucial aspect is vibration control. If you are using the stock rubber feet that come on most gear, this will obscure low level detail. Switching to cones and other such footers will make a big difference.