So which sub did you go for? Evo 4.2 specs claim FR of 54-22k
I went for the B&W ASW608, own it already for over a year or so I guess
The Evo 4.2.
Freq response - 54Hz ~ 22kHz
Bass extension 48hz (it has some bottom freq room)
B&W ASW608
Freq response 25 to 140 Hz
Cut off can be dialed all the way, which means it can connect at preference.
A big plus to me is also that it is a small footprint sub which can easily provide all necessary bass power for a living room altough I only use a minimum fraction of it. (it is not for a reasonable non-home cinema, but that's ok).
Seen many subs that don't provide that much floor and only allow a minimum dialing in to somewhere above the ideal extension point. I still have a sub (Polk) like that upstairs, which kind of connects well to my Denton 85 there. But finding subs that fit to print within a certain price range remains a challenge. Most of them are tailored towards smaller bookshelf speakers, which is fine. But the B&W just gives a bit more and receives praise in reviews for doing so. It adds about 4 useful settings rarely found on subs in this price range.
Edit: Just read the What HI-Fi review which gave it 4 stars, they probably have compared it to the likes of the B&W ASW610 or models a bit up the range which go even deeper. But when comparing it to the other models on the even lower priced spectrum, the B&W is a great performer. At least for the EU market (Might miss some UK / US models here)