I don't know why anyone would say that the product linked in your original post would work with a Duet. They must not have a Duet.
You need an adaptor or cable from 1/4 TS (male) to RCA (male). These are extremely commonplace adaptors, and you can find them just about anywhere audio gear is sold.
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Apogee Duet -> HeadAmp Gilmore Lite with Dedicated Power Supply -> AKG K 601 / Grado SR 225 / beyerdynamic DT770 Edition 2005 / Etymotic ER-4S
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