You’re right about Mordaunt Short and Richer Sounds, M/ Short are Richer Sounds in house speaker manufacturer and brand, Cambridge Audio being their in house electronics brand. If you ignore the brand snob/price nazis,it’s terrific kit for the money
Mordaun short 906 from your description, three drivers arranged vertically? I’ve got a pair on my second system,and yup, they’re pretty engaging,I like ’em lots.
It’s worth making sure you use the spikes to isolate the cabinets from the floor. I’ve filled the lower box in mine with playpit sand as well. Really damps cabinet resonance and tightens up the bass and stops the kids knocking them over.