Quote Originally Posted by E-Stat
As I stated earlier, perhaps these are semantic differences from across the pond. You call it a bonnet - we call it a hood
....
Sure. There is output to the rear! In my room, the most linear measured bass response was achieved at eight feet out into the room. Specific placement tuned the bass response. The rear wave is controlled via bass traps.
Excellent, we got there in the end, makes one wonder why you disputed Sir T's essential point about greater room interaction due to rear-radiation in the first place.
I'll let you argue that point with Siggy since he disagrees. The following text is found here.

"The rear tweeter does not contribute to the direct sound coming from the front of the speaker over a very wide angle of +/-60 degrees off-axis. This is due to the relatively wide baffle that I use for ORION. It is also an indication that there is little diffraction effect from this wide baffle and hence the good imaging. Thus under anechoic conditions, or outdoors, one would never hear the rear tweeter from any normal listening position. In a room, therefore, anything that is heard of the tweeter, is heard via reflections off walls and objects. "
Read more closely the text is in perfect agreement with what I said previously, Siggy talks about the front of the speaker. In the previous configuration i.e. without the rear tweeter, the backwave comes from the back of the tweeter (and speaker) not the front.