huh?tuning frequency is a byproduct of all the things that need to be done to get to your requested response curve at your listening position of choice (headrest maybe?)
your post was pointing up to bucks, which mentioned too little power."do not tune at 27 hz. not recommended and everything else will sound like crap. your deff not going to get SQ when tuned that low" had nothing to do with over or under powering.
Maybe older type R? We need some recommendations for 500w.Since not enough power for the Fi Q....what other sub??? Need to choose one cuz I'd def prefer a single 12 setup.