What makes sense about using these speakers with B&O gear? B&O was known in the 70s for modern design, not something that looks like something from grandma's boudoir
I think you may have some misconceptions about "vintage" audio.
You want a good speaker, that's what we all would like
How many drivers does this speaker have? 2 ? 3? The woofer size doesn't necessarily mean it would have excessive bass. Hopefully the speaker designer took the whole frequency range in mind and developed a proper crossover for the drivers and cabinet design involved for a good overall response.
Having grown up and started my audio journey in the early 70s myself, I'd rather have newer speakers generally. There were a few back then that could be considered "vintage" (i.e. like this definition "of old, recognized, and enduring interest, importance, or quality
: classic" (Mirriam Webster). Hard to know where to place your speakers on other than the photo of the front, which isn't much to go on....