I stream music from pandora. Do not need interface or airplay. Music level does not need to exceed moderate listening level. Floor placement. Does not need to be portable or outdoor. If price is exorbinant, can use one wired speaker. Thank you!
Don't know what you consider exorbitant but you could use one or more Sonos Play speakers You would control them with your smartphone to access Pandora and other internet sources Your phone would not have to be on all the time as you don't have to stream from the phone to the speakers. You only use it as a remote. You could start with one and add more if and when you wanted. The app for phones, tablets, and PCs is free.
www.sonos.com