It is UNMISTAKEABLE. In my alignment, 13Hz tune, I LOSE a ton of output at 8Hz when plugged, I lose a TON of output on The Incredible Hulk fight sceen, and at 5Hz I am the same both plugged and unplugged. I will NEVER go sealed again! Ever since Brian made his thread about his 8 IBed I have been losing sleep. I spent around $375 to build the towers in wood, caulk, and screws. I could have gotten more IB3s instead, I would have gotten 8 as well, 4 per EP4000.
First let me say my woman is amazing. I see "WAF" and think WTF is that? Get a new wife. She sat with me numerous times tonight listening to test tones plugged, unplugged, process repeat. Watching the same fight sceen over and over.
Second let me say it is very difficult to ignore the WIND. With the ports unplugged, no matter where you are in the listening room, you feel WIND. The closer you are to either port, it goes up exponentially... you simply can not concentrate souley on what you feel bouncing up and down when your skin suddenly gets COLD and your hair tickles. She was sleeping earlier tonight though Inception and her hair BLEW from 15 feet away, out of her hand, while she slept. I can do subsonic hair tricks in my house
Fan blades obviousely bounce much more unplugged as well, had to kill all the lights to keep from getting biased from watching movement. When the red/blue/black lights and Xmax tree are glowing, you see the fan assembly flop, fan blades look like wings on a bird, and those four giant 16.5" cones leaping from the towers... it definately adds to the effect.
Something to note, while watching Hulk sceens I can add +1dB to the sub level to match sealed excursion: I can watch at -2dB ported and -3dB sealed to get no kissing at all, -1dB ported and -2dB sealed I slightly kiss bottom plate. While comparing though, I left it at -3dB both ways. We ignored sound, ignored vibration and mid/upper bass, and simply focussed on the super ulra low flopping. It was unmistakeable in the difference.
On the 5Hz and 8Hz test tones, there was much more excursion sealed than ported, while ported was much louder with the same level setting.