From the description of your room layout, it sounds like you would benefit from a separate front-facing sound system (AVR system or soundbar). It's hard to visualize the layout or determine if this is the best solution, so you may want to use your own best judgment.
If you feel that a wireless solution is necessary, there are a few systems available. This Vizio system as an example only, since I know nothing about the sound quality. You may want to rely on independent or user reviews on wireless speaker systems.