Your system begs to have the electronics and table off to the side rather than between the speakers. Take a look at Jeff Smith's "Get Better Sound". There is literally zero chance that all that hardware is not being affected with vibrational energy from being between the speakers and zero chance that all that hardware is not interfering with the speaker performance. I don't mean to be a peanut gallery detractor. That said, this is "Exhibit A" to the concept that lots of us spend tons of money on gear and don't pay enough attention to optimizing the room and set-up, much of which can done for almost no money but just a healthy expenditure of effort and time.
I wouldn't be quite so quick to judge. Some people don't have much of a choice because of architectural limitations. They play the hand they're dealt.