Call ML they will tell you - I had the same questions about the Requests and Odyssey.
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Version one is bi-wireable.Version 2 ML used different bi-wire connections and the speakers came with upgraded spikes. The sound is identical.Version one used gold connectors and they were spaced closer together. Version 2 used gold with plastic covers and spaced the connectors further apart at angles.They icreased the price $200 for each speaker as a result prior to the Ascent replacing them at yet a higher price. Hope this helps.