Sorry but it's not clear enough what kind of subwoofer (passive or active) you want to use. The passive one has no power supply connection, the active one has a power supply connector and the audio connector can be connected at the "audio out" for the subwoofer, at the rear panel of your STR-DE1075. Take a look at this photo:
In case you need a user manual for your receiver,
here is an official link.
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Stelios
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