Well, it’s here. The fully integrated DSP Nelson subwoofer for your P3ESR and any LS3/5a. First of the digital active options Harbeth are making. No prices yet but looks interesting. I am however, slightly baffled as for all these years, open frame stands were always favoured
https://harbeth.co.uk/nelson-subwoofer-stand-solution/
https://harbeth.co.uk/nelson-subwoofer-stand-solution/