I would ditch the subs and start over. I had an orion cobalt co124s and it blew up in less than 10mins. Was running it sealed in 1.2 cu/ft after sub displacement with about 500w rms and it didn't get loud till it was getting its *** kicked. Yea, yea I know I was overpowering the **** out of it but I'd expect it to hold up better than that. I have run double the rated rms on 4 different kinds of mtx subs, run double the rms to a Boston G1 and a ton of other subs I have run over rated rms to with 0 issues. Even had some crappy MTX road thunders have held up almost double their rms. I'm not really experienced with Orion but I have heard an older pair of their 12s, not sure of the model/box (early pair of hccas?) setup but man did they sound poopy.
FWIW I have never seen anyone running an Orion setup, tuned under 40hz, it seems to me they are all farty spl subs. I could be wrong.