How to measure a backfiring speaker?

[hipath]

Hi all, I am planning a speaker with a backwards mounted subwoofer, a mid woofer and a tweeter at the front. I understand how to measure with REW the front woofer and the tweeter FRD, but I am at a loss on how to do that for the back firing subwoofer speaker. Can anyone give me some insights? Thank you.

 

[AudiocRaver]

In normal use, the subwoofer will be omnidirectional and it should measure accurately from the front. For in-room measurements with the speaker close to a wall, the spacing from the wall will affect the low frequency response; the closer the speaker is to the wall, the more of a peak you are likely to measure in the sub frequencies.