No such thing as an untippable speaker stand. Something that has a low center of gravity and heavy (sand fillable) is the best choice. Something with a large area between the spikes is also a good thing (wider stance). Connecting your speaker to the stand using screws or use blu-tac if screws are not an option. If you really want it to be untippable, connect a 3 x 3 foot piece of plywood to the bottom of the stand, then any kid who is close enough to tip the speaker will have his weight on the plywood, making it impossible.
It's a VIRTUAL channel unless stated otherwise.