@ajc9988 Thanks for this.
I’ve made significant progress since my post. There are so many drivers by so many manufacturers. It’s easy to whittle a lot of them out as they naturally have a rubbish frequency response.
I actually have two working speakers and I’ve finalised a crossover design that works.
DATS V3 arrived this week and I have a UMIK1 so it’s time to measure the drivers in the cabinets to make sure the crossover works in real life before I buy parts.
I bought a cheep pair of 3-way crossovers and use Dirac Live in my amp to “fix the issues” and they sound great.
I went with Scanspeak 70003 tweeter – flat to 20KHz and goes to 30kz+ (eyewateringly expensive)
SB Acustics Satori MD60N-6 soft dome mid. (Not cheap)
2 x Dayton RS225-8s (got them cheap in the UK)