I was wondering if the experts can chime in on this. I was chatting with JL Audio tech support and one recommendation given was to plug all ports on the M80's and run the crossover to 90hz. I was curious if anyone has tried plugging all ports and if they felt mid range was better this way? Their reasoning behind it is they felt the Fathom get do well up to 90hz and by not running the M80s full range it would make the speakers more efficient and have the midrange sound better. Thoughts on this?