The cheapest solution is of course connecting your computer or laptop with your audio system using an audio cable. But controlling playback from your computer or laptop all the time is probably not what you prefer. 

Remoteless to the rescue. Good news. You don’t even need a Premium account, the app works with all Spotify accounts, Free included! A remote for Spotify on your iPhone to control Spotify from your couch via WiFi.

You can import your playlists and play them from your lazy chair. Louder, softer, next track, previous track, no problem. You don’t even have to stand up to start Spotify. During playback your iPhone shows the album cover and the track info.

Remoteless is available in the App store. You need to install the Remoteless helper on your computer to make it work. This Remoteless Helper can be downloaded at remoteless.no

Sound quality:
Max 320 kbps (Premium account)

Bluetooth Music Receiver

Another cheap and versatile solution. A Bluetooth Music receiver allows you to play music from your smartphone or tablet to your hi-fi system or car stereo. Just connect the receiver to your stereo and you can play all Spotify music using your smartphone or tablet as the controller. And if your laptop or netbook has Bluetooth you can connect these as well. 

But there is more! You can stream music from other apps and as well.

The Marmitek BoomBoom 75 Bluetooth Music receiver costs just €34.95 / GBP31.95

You can also use this little receiver in your car! Plug it in the Aux port and enjoy!

Sound quality:
When using the Spotify mobile app 320kbps. (make sure you tick Extreme in the settings)
In case you use a laptop or netbook and a have a Premium account: 320 kbps.

Apple AirPort Express

Airport Express is a wireless network router that you plug in to your stereo using a regular audio cable. You send the music over your WiFi network to the AirPort Express which will pass in on to your audio set.

To stream the music from your computer to your Airport Express you need to install a program called Airfoil.

Of course this works with all Spotify subscription plans, Free included.

To control playback you can use the Remoteless iPhone App as mentioned above.

Sound quality:
Max 320 kbps (Premium account)

Apple TV

You can also use Apple TV in combination with Airfoil. But Apple TV can only be connected to your stereo with an HDMI cable or and optical cable.

But there is more! When you have a Spotify Premium account and an iPhone, iPod Touch or iPad. You can stream Spotify to your Apple TV using the Spotify App. No need to use Airfoil or an extra remote at all.