Originally Posted by jackbuzz
It will sound terrible.
Do this experiment, cup your hands, place in front of your mouth (megaphone like) speak a sentence, what does it sound like?
Subwoofer with open door or mesh would be probably be fine.
What makes you say that it will sound terrible?
First of all you are talking about two completely different freq bands that have very different wavelengths and therefore very different directional characteristics.
Second, what you are describing about cupping your hands is a poor horn at best (well designed horns don't sound that way).
Third, There is no horn involved in the setup he is looking at.
Even if the sub is facing backwards (whch is the way I would start off doing it), he will get beneficial gain from the wall and by energizing two of the boundaries (floor and wall) he will excit more of the room modes, so the bass will be more even throughout the room.
At worst case he should maybe pull the stand a little bit off the wall ( say 6-10" or so) so as not to constrict the sub wavelengths.
I think he will be just fine.
Now getting a sub that will perform to his liking that will fit inside the cabinet may be a different story-but that depends on his needs in the sub department.
Yes he will get an early reflection off of the shelf, but it iwll be very early and will direct the energy up into the ceiling.
Agreed that having the door a mesh and STILL opening it would be better.
Of course there will not be a very wide stereo image-but that is part of the price you pay for having speakers close together.
But I cannot see in any case it will sound like you describe "a cupping of the hands".
Do you have some information/data to back up that statement?