Based on what I've read from others and some light research, there really is nothing inherently wrong with what you're considering so long as you level match the two subs. Personally, and just recently, I upgraded from a VTF3 MK3 to the VTF-15H. I also have a Velodyne Impact-12 sitting around unused. Weekend project, I'm thinking of integrating both the VTF3 and the Impact in the rear with FMOD 50Hz High-Pass filters to give the room a bit more power in the mid-bass.
I don't know for sure that it'll work, but it seems like a fun weekend project. I'll first try opposing corners in the rear and possibly even stack them to see which one will give a better response and more SPLs.
M. Enois Duarte
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