Is playing through WiFi speakers transmission? If just to myself? If I have friends present? What is the source is upstairs and the speakers are downstairs, et

Is playing through WiFi speakers transmission? If just to myself? If I have friends present? What is the source is upstairs and the speakers are downstairs, etc. I think the key factor is non commercial and to a small audience of friends. And that was why I thought fair use. It’s not clearly defined, but Wikipedia describes it as “ flexible proportionality test that examines the purpose of the use, the amount used, and the impact on the market of the original work.” So the whole song is played but the purpose is limited and there’s zero or negligible impact on the market.