Any thoughts on RE Audio SRX12D4?

thinkin about 2 of these in a vented enclosure tuned to 35 w/ subsonic runnin 24db/30hz. they state quite a bit of xmax but cant find the size of the VC on them... also states copper vc on these. how does that hold up heat wise. and it has a very high bl of 14 as stated on the re site i believe... sounds a little high to me.? tnx