An active streaming speaker suits you if you don't want to bother with an amplifier. This product has built-in support for Spotify to give you easy access to your music.
From Peter Tyson
Yamaha MusicCast 50 WX-051 Wireless Speaker - White
HyperFi
Yamaha WX051 Wireless MusicCast 50 Bluetooth Speaker WX-051 Black 308770
This product is also available at 2 unverified stores.