I can't tell you that. My guess is it is probably not the most refined speaker, but it should be able to get loud. Probably overkill for surrounds.
For a front left/right in this vein, I would go for some
Fluance Signature towers. A couple hundred more, but they do have good bass response, and good performance metrics. The only problem is I think that their corresponding center channel speaker might not be worthy of them. Also, they are not near-field, speakers, so you want to give them some distance for the sound of all the drivers to coalesce, at least 9 or 10 ft or so.
But again, the bass extension of these speakers do not matter if you are using subwoofers, so I wouldn't worry about woofer diameters unless you have no plans to use subs.