A1 Isolation transformer for Polk Audio SDA 2B

I have the SDA 2B's that are blade blade therefore one active conductor in the interconnect. In order to use an A1 / Dreadnought style isolation transformer I need connect a wire from the negative terminal binding post to the unused blade on the back of the blade terminal. Is that correct ? That is what I recall anyhow.
Not gonna do anything till I know though...Thanks.


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