Yes, depending on the function you want to use, you need even more. Examples...
- HDMI cable for the connection to the TV
- Network cable for connection to the router
- Blu-ray player for playing Blu-rays
- etc.
The loudspeaker cable is well suited for connecting the loudspeakers. Experience shows that you need a total of approx. 30m (2x 10m for surround, 2x 4m for the front speakers, 2m for the centre).