There are other amplifiers for the Dynaudio system that will also work, yes. I took the 10-channel version with 4 bass, 4 treble and 2 subwoofer speakers.
There is also a 8-channel Dynaudio system with no subwoofer or a Helix soundsystem.
In case of a Dynaudio system, just make sure it will fit the Golf mk6 generation cars and not the newer mk7 based cars. The Helix plug-and-play system will fit all generation cars.