I am an SQ guy when it comes to home theater. Tune it as low as possible and add more power if necessary.
usually, 33hz tuning makes a peak around 55-60hz which is great for cars and house-music in clubs.
The thing is.. the lower you tune it, the more smooth your response will be. With a 25hz tuning, it won't be loud at 60hz but it will shake your nuts at 30hz.
20-25hz should work best.