Aktchi, if a rear-ported speaker is designed and tuned for corner placement, that can work well. The AudioNote AN/E is an example of a rear-ported speaker that's intended to be placed in a corner. What they do is tune the speaker quite a bit lower than normal in anticipation of the generous boundary reinforcement from the port's being almost right in the corner. The result is very good bass extension without boom.
Lower tuning calls for a longer port, and longer ports are more likely to have internal midrange resonances (think of talking through a cardboard tube). By placing the port on the rear of the cabinet, any midrange resonances are less likely to be audible out in the room.
I think the Audio Note technique is good enough that I paid 'em the ultimate compliment: I copied it.
Come to think of it, the AudioNote AN/E should be among the recommendations for Springbok's system, as it's designed for smooth power response when placed as intended - definitely an Allison-esque approach. In fact the speaker's lineage traces back to Allison: The AN/E is a modern incarnation of the Snell Type E, which was designed by Peter Snell, who was a disciple of Roy Allison.
Duke
