Not quite rocket science to put side ports into a cab but Forte might have done it best http://thaddeushogarth.berkleemusic...e-3d-112-guitar-speaker-cab-great-tone-in-3d/
The vertical orientation of the drivers would give much better off-axis response. Some good engineering there!
Plus the rheostatic thesamizer is oriented in a forward-biased zenith, resulting in the maximization of the trans-dynamic flux.
Yeah, that is better!I like the sealed/vented "3D 212 S/V" the most.