just install a set of pegasus PG162 today

before this i put this at the back temporary for testing purpose..i found it sound very nice and up to my expectation when listen facing it..

after that, today i finally got time to put this into my front door..the sound totally sucks..mid bass gone, sound very empty and missing all vocal..only tweeter sound is heard

what is the possible problem? sound proof? tweeter position?

btw, it is powered by the same amp before and after

help pls..

install by shop.

added 2 layer bitumen on the front door and remake the speaker mount, flip polarity

now all ok already