SMALL sub for twin 8's

[amplifierguru]

I recall there being a (vented, I believe) twin driver arrangement that shrinks the box size over a single for the same response. Can anyone detail this? Or provide a link.

I have some 8's good for 28Hz with some 6 dB of bass assist in a 27L B4 alignment.

 

[bigwill]

Look up Isobaric loading. It allows you to half the volume of an enclosure.