A few thing to note about PR's, typically we recommend two which then splits the excursion load and secondly if you don't use a high pass filter you can risk the pr. Unlike air in a port, the pr can break! The 12" PR's do a bit better because they have 10" spiders which limit closer to the surrounds limits.
What we'll do is replace your PR and send you a second one so you wont do this again. Run both at the same time, so cut out another whole in your box and make sure the two PR's are opposite and put the driver in the new hole. Also in about 1 cubic foot with the 10" PR, you can run it with no weights and its about 32Hz tuning. With two PR's it will be a higher tuning. If you added any weight on that PR in over 1 cubic foot, you'll probably be down in the 20's for tuning.