Hello mojo,
I hope a US member can answer your voltage question, I cannot tell.
The BeoSound 4000 for sure cannot handle HDMI signals. But there should be other options using its analog AUX input. Are you sure your TV has no Toslink optical out? If it does you would only need a little converter and the right cables (Steve has those too) to bring the TV sound into your 4000.
Regards, Johan