Maybe you can make some tall, DIY acoustic panels like mine, but pull them out when you want to do some listening, pull the speakers out and lean the panels against the entertainment system. Then when you're done, put the panels away. That, or mount acoustic panels on stands (DJ or other). You can also buy ready made acoustic panels with stands.
You can view my panels in the Virtual Systems page by doing a search under Green Mill North. My system pops up. Good luck!