JB, "biampable" probably isn't the most relevant term. As I mentioned previously here
, some speakers have had drivers also on the back, making in effect almost two complete speaker assemblies in one enclosure, situated back-to-back, to achieve a more nearly omni-directional output. If so, it isn't a matter simply of a bass driver being amplified separately, but rather that the back drivers are being fed a different electronically processed signal rather than the "normal" one going to the front drivers. This would require a different amplifier channel(not necessarily an entire different amplifier)than the one powering the fronts.