Help Choosing new sub

[ShadowElky]

I have been wandering the forums for a while and decided to finally make an account and get some advice. I recently decided to upgrade from my 2 10" RF P1S4's to a single 15. I purchased a Hifonics BRZ15D4 in a small ported box. A friend had a larger box that is about 3.90 cubes tuned to 30hz. Since the Hifonics is dual 4 ohm I can only run at 2 ohms. Since my amp is stable at 1 ohm I decided that I want to upgrade. Am currently looking at buying the Sundown SA-15. Will that work well in my current box? Will be upgrading box box and amp eventually but due to time constraints I am stuck with what I have. Any help is appreciated.

TL;DR.. Will a Sundown SA-15 work well in a 3.9 cube box tuned at 30hz on a Pioneer GM-D8601 at 1 ohm (800 watts)? Or will something else work better?

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