ive read from many people to do a 1:1 ratio, but every time i have tryed the 2:1 they either peak to low or peak to high. So i would do a 1:1 so it has a nice bandwidth, and tune it from 45-50. From my experience, i have the exact same sub sitting in the corner of my room in a 1.5 cube box tuned to 33 hz and it still peaks high and doesnt really like the lows, gets warm on 200 rms. I would tune it in the high 40's which will still have a lot of lowend, prob more than you have now.