To use Google Home devices with voice control also for music selection on a Teufel system, you can connect it with Google Home if the Teufel system offers either a Chromecast or a Bluetooth* interface.
*Bluetooth currently only with the current Google Home Mini.
Option 1 > Voice control with Google Home/Home Mini via Chromecast.
Connecting your own system to Google Home via Chromecast enables the sound output of the content requested via Google voice control (radio, album, playlist) on the wirelessly connected system. It is not the system itself that is technically voice-controllable, but the music that is output via it. So, if you don't necessarily want to switch the system on or off via voice command, you will be able to use the voice command benefits.
Option 2 > Voice control with Google Home Mini via Bluetooth
The current Google Home Mini surprises with practical innovation because it has been equipped with Bluetooth in addition to Chromecast. With this technical extension, Google on the one hand draws level with its competitor Amazon, and on the other hand, new combination options with Teufel Bluetooth Speakers open up.
We also mention here that connecting one's own stereo to Google Voice Control via this option makes it possible to output the sound of the content (radio, album, playlist) called up via voice control. Thus, it is not the system itself that is technically voice-controllable, but the music that is output via it. A limitation, which shouldn't affect the listening pleasure much, though.