Passive Bi-Amping of Stereo Amps

Is it possible, via balanced "Y" input connectors, to use a stereo amp (such as Levinson) to run a single speaker with only one pair of binding posts (of course using another amp for the other speaker :))? IOW, there would be 2 pair of output wires connected to the single pair on the speaker. Levinson's manuals show such a configuration but connected to a speaker with 2 pair of posts. I cannot consider bridging because my speakers are very low impedence types. Also, if this is possible, would it result in double the output per channel?

Thanks!