a different Q simply by where you install the woofer(s) 

 

This is the most common way to load the "House Wrecker" using one subwoofer. Response starts around 250 Hz and gradually increases until around 35 Hz where is begins to roll off.

 

Installing the subwoofer like this changes the volume of each chamber by two times the volume of the subwoofer.  The shrinking of the high bass chamber and increase of the low bass chamber will exaggerate the low bass response and flatten high bass response.

 

Loading it like this reverses how the box works making the larger chamber the bottom and the smaller chamber the top. Depending on the type of woofer used the response could be real flat or super peaked.

 

This will mellow out the previous alignment a bit offering a less pinched response.  It's a good idea to try your woofer this way and the first way when you install it.

 

This is a take-off of the first alignment that tends to shift the response down by 10 or 20 Hz and is considered a true isoberrek alignment.  The large air spring between the woofers yields interesting results with different woofers.

 

We're having fun now.. Don't forget to reverse the phase of one of the speakers.

 

This is the ultimate way to load the "House Wrecker" using four subwoofers. Remember, we levitated a floor rug with this thing using only one woofer!

 

General Notes   This box is offered for hobbyists who love to experiment. Since there are so many ways to load it, you should be able to find at least one that works with your woofer - regardless of the type.  The above illustrations depict only a few of the many ways this enclosure can be loaded. You may also experiment with running one of the woofers as a passive radiator for increased gain.  Because of the many possibilities this box offers for alignments, no technical data is offered.  For the 15" version ideal woofer selection if you going for low bass would be a subwoofer with an fs around 20 Hz, and a Qts less than .38 and a minimum VAS of 10 cubic feet.