There has been some interest in this speaker in the two channel and one of the original designers is making a new version so you might just be able to get some support . These look in quite nice condition and provided they do not sell for silly money seem a good buy. I have wanted a pair for ages after hearing a pair in Colwyn Bay many years ago . But I have too many speakers and no room for them plus they are a very long way from were I am .
https://www.ebay.co.uk/itm/IAS-beaulieu-Speakers-Rare-vintage-Integrated-Audio-Systems-speakers-Stands/284212383773?hash=item422c60d01d:g:IdYAAOSwZsRgRof7
https://www.ebay.co.uk/itm/IAS-beaulieu-Speakers-Rare-vintage-Integrated-Audio-Systems-speakers-Stands/284212383773?hash=item422c60d01d:g:IdYAAOSwZsRgRof7