Have you try that out? I have it and it dont works with my BVE. BL 7.4 is only a mono speaker and not a typical stereo speaker from B&O as the other ones do you know.
But ok, I am not a technican and I am very happy with the splitter when the helicopter flight from the left side to the right side in movies.
You can try it out and make your own experience.
Contact here
or over ebay here
maybe Steve can answer here too about the mono problem with the BL7.4
Steve dont send outside UK for this moment 🙁