No material difference. Either the 279.00 version is an old version or it's a refurbished version.
The 409-euro version is the same product, just released in 2024, but it's exactly the same product.
The black one which I purchased, the tonal quality/ is impressive.
....the price difference is probably due to the fact that people prefer the colour Black to the white one.
Hello Salsatom79
I also operate the box via 'hey google', but I can't answer the question about connecting in a multiroom. There may be an app that makes this possible.
Sorry that I don't know more about this.