If these are just for home use, don't go overboard in assuming that there has been a 'radical' improvement in speakers over the last forty years!

B&O stuff was some of the best stuff you could buy back then, whereas Logitech is some of the CHEAPEST stuff you can buy now. It's good, but for sound balance over a set of B&O's? I doubt it.

What's your current problem with the rig you have other than worrying about it being old? Does it distort? If not, what's the issue?