...A friend has a Bose wireless speaker which was $300 and he can walk around the house without loosing the signal.
You may have answered your own question.
Bluetooth is often considered for very short direct communication. But the official specification does not say that. The frequencies used and the power level make it a challenge to provide reliable communication in a are where objects things are moving around.
BTW: This item just came into my radar.
Wireless Audio Device Market 13.75 Billion by 2018 Here is a window of importunity to get into a new market. You could start blog about your own experiences and observations and invite others to add comments.
EDIT: That link also wants you to to buy a subscription. You don;t have to subscript to just read the summary. .