Rear vs. Front Port

[sreten]

You need to consider the size of the airflow out of the port and
the way the wall interacts with the airflow. I'd suggest that a
spacing of near 1/2 port diameter is the minimum spacing giving
the most detuning, and once you get to port diameter spacing
further spacing is not critical for port tuning, but larger spacings
are critical for upper bass/mid balance.

Nearer wall spacing less than 1/2 port diameter by minor
adjustment is more flexible than "port bunging" with foam.

sreten.

[kelticwizard]

SY, Sreten:

Figured it would be something like that. That is, just a few inches.

The reason I figured the space would be small is that essentially this situation would be a downfiring port, only using the wall instead of the floor. I have come to understand that this downfiring port configuration has many advantages, and the ones I have seen are never more than an inch or two off the floor.

So I guess once you go more than few inches away from the wall, you are in a situation it doesn't matter much where the port is. But if you move it up closer, you might get some advantages.