I used them for years to bi-amp with. Later I built a little box with a heap of very high quality phono sockets on it - 1 in / 4 out so I could tri-amp and plug in a headphone amp. I still use the box but can't really tell the difference between it & the splitters. You could do something like this, but if I were you, I'd stick with the splitters you've ordered - they're perfectly fine.

