Comment The sound sucks because your gear sucks. (Score 1) 95
Get management to pony up for real AV gear. The problem is your gear is garbage and not designed for the use. There is no magical CHEAP thing you can buy.
Now get a biamp or BSS DSP and 4 boundary mics hanging from the ceiling on some 18" diameter glass plates... I can make a meeting room cover all voices in there perfectly for video and teleconference.