Sound bar in a box . . . can't understand dialog.


We have a large credenza in our bedroom that houses the TV, video gear and sound bar (a modest Visio) facing the bed. It's become our favorite movie theater. Think a 4'x3'x8' box with doors on front. The "booming" caused by the interior reverb of the credenza box makes any dialog unintelligible.  Tried moving it out a bit when open (a pain) as well as adjusting out lower freq.s and boosting treble. No luck.  

Any suggestions on something more creative would be much appreciated!

ALERT! Wife is an interior designer so anything that does not fit inside box is not acceptable. 
dancub
or get a panasonic oled tv,,, the whole tv itself it the  speaker panel.
works great and wife friendly. 
Now a days every TV needs a soundbar. You may ask why? Because the default sound system of the TV is not quite enough. There are lots of soundbar in market right now. They are lots of variety in size, price and price. So it is very difficult to choose right one.

Literally you don't have to spend much to get the right soundbar for you. There are some extremely cheap soundbar in market. They aren't good enough to serve your desire. So you have to find one with $200 or around $200. when I am researching I have found a nice guide on it. You can check it also.

Cheap yet premium soundbar:
https://pickinghut.com/best-soundbar-under-200/

I have noticed another thing is that some of them offering soundbar with sub woofer which are really good. Thanks for your time.

Regards,

Carl