Will this work? I have an older audiophile passive subwoofer with a crossover network for two satellite speakers. The subwoofer is 4 ohms. Will this work the Beomaster 7000? Can I damage it?

It will be fine - speaker resistance is all just an estimate anyway as it is not a set amount of ohms over the entire frequency range. The 7000 will cope perfectly well.

Thanks. I'll give it a whirl tomorrow.