Hey all, first post here. I know it is an old thread but I am here to research and build a rig specifically for psy.
Now the reason your rig sounds so good with psy is the reason EVERY rig sounds great with psy, and also why psy heads can tell you when a rig is poop. Firstly, a large emphasis is placed on keeping bass IN PHASE at all times durong production. Kick and bass tracks will be nudged untill bass is perfectly in phase with the tail of the kick. If not the kick will be faded out before the bass line hits.
The second reason is psy masters are generally rolled off from about 70 Hz. So no nasty sub eating amp power, most of the energy is around 120Hz. So far as bass goes, it is literally MADE for horns.
The fact that there is also zero noise as none is recorded live also helps, so you can really push SPL with little harsh feeling to the tops and mids even on a crap rig. Far as big sound goes we try to play nice from the production side upwards