John Phillips wrote:
I'm not familiar with subwoofers and would appreciate advice on
creating a shortlist to audition. I regret I do not have a spare
cupboard to do what Don Pearce did and anyway I prefer to buy rather
than make.
snipped

Why not just buy speakers with bigger drivers?

Tannoy JBL

or kit built for you from

https://secure.wilmslow-audio.co.uk/...Systems_1.html

Forte would be a good buy