it's been a while since I've been challenged on my "infinite baffle woofer" usage, but someone is... forceful again, so i thought my reply is a good one for all the IB3 VAN builds
I have already proved the IB3 18 works great in an enclosure. I have been running mine in one for the last year. Over a year ago I ran it in an Aztek, 21.5 cubic feet, 7.5" port, 15Hz tune. I then retuned to 20Hz, 25Hz, and 33Hz to experiment, then back to 15. I first ran it with a Lanzar OPTI2000D. That wasn't enough power for this ""IB"" sub. Then I got a Hifonics BXi2608D. It still wasn't enough at 2 ohms, so I ordered a custom dual 2 recone kit to run it at 1 ohm.
Then I brought the box in my home. It worked great in-car and in-home. In the house I first ran it off 2 cheap walmart plate amps. Considering the power it was most impressive. Then I ran it off a Behringer EP4000.
Since I was right, I bought 6 more of them, and I am now running 2 of them in 128 cubic feet each, with an EP4000 each.
The VAN build is the same thing... 22 cubic feet, 15Hz tune...just more port area.
This is a video in the Aztek off a Lanzar OPTI2000D. It was loud, it was clear, it was low, responce was smooth, flat, and wide. It played very high as well.http://www.youtube.com/watch?v=yGWsO36WPtc
I hope you have a good stereo on your PC. I just watched this vid and it made my computer and monitor BOUNCE in the next room. Anyone who wants to politely ask my opinion, fine, but beware about being cocky. This video right here was made with a cheap 60 watt amp from walmart. I'd like to see any other subwoofer do a lot better than this one did off 60 watts..period.http://www.youtube.com/watch?v=kc45DVa205Q
The camera used in the last vid and this vid was terrible, all noise is distorted..even quiet... so this is exaggerated a bit. But for 60 watts, this "infinite baffle" subwoofer shakes the entire house.http://www.youtube.com/watch?v=b9waeVEMYhY
Now the thing that I loved about the walmart amps, was they played single digit subsonics that my EP4000s can not. This video was made to show the guys on Home Theater Shack that I indeed did get a lot of port velocity on a 7.5" port with an IB 18 with less than 200 watts. This used to shake my house with the 1 sub, but with my new amps it's almost not even present. EP's are known for a steep roll off below 20Hz.http://www.youtube.com/watch?v=Z08-wdYLYnA
gotta love WOTWs. while in a huge box tuned low to get subsonics, it still hit hard, kicked hard, slammed hard for the punchhttp://www.youtube.com/watch?v=iOgvx6-pXYg
my favorite part of the whole movie. if you dont have a huge system hooked to your PC youre not gonna get this...it is far too low and you have to move a LOT of air.http://www.youtube.com/watch?v=nVfQeNr3V4Q
a song with sub 20Hz material and thumping at the same time?http://www.youtube.com/watch?v=Kw2AgXgqzns
got the EP4000's, my old sub was dual 2, the new ones are dual 4, so I wanted to blow my old sub to recone it as a dual 4 so I have a replacement. this is a 17Hz sine wave... a lot of power AT TUNING. with an infinite baffle speaker. hmmm. blowing wind across the room.http://www.youtube.com/watch?v=_bH-vBmcvJc
10Hz on a 17Hz tune... unloading still shakin my house and blowing air full excursion. listen to the EP4000 fan kickin it in high gear at the end when I stop the sine wave.http://www.youtube.com/watch?v=jAJuDR_q48Y
Built the Two Towers.... distorts the crap out of the new camera, 780i HD
These were with a 6.5Hz tune! 128 cubic feet per box, 12" diameter port, 48" longhttp://www.youtube.com/watch?v=S2-I-WmbUMshttp://www.youtube.com/watch?v=vnla31MFWR0
ever made two 200lb boxes rock back and forth and fan blads bounce froma 6Hz sine wave?http://www.youtube.com/watch?v=NY_JNzJMA1A
retuned to 15Hz... FULL EXCURSION sine wave for a full minute, didnt even get the sub warm.http://www.youtube.com/watch?v=pbz7bKnDbaA
did it again, with my back door shut. It is on the other side of the house...and it was moving so far i could see light through it from outside.http://www.youtube.com/watch?v=n6jQTaDAQjw
I rest my case