@immatthewj I know nothing about the Voltis. As you know, I treat my OCD with silly projects like this https://speakerchoices.com/ maybe it can help you.
I think any 2-way small-ish speakers will have limitations. I have been successful with subs and lucked out with speakers and I know it's very personal, so the more I know the more I would keep my mouth shut. But if I couldn't I would suggest that you are a British speaker person.