SONY STR-D715 subwoofer connection??

Solution
If your sub has speaker level inputs then use them.
If it doesn't then you can connect a speaker to line level converter to the speaker terminals. If you have A-B speaker terminals you can connect it to the B terminals. That way you can turn the sub off from the front panel of the receiver if you want.
May need some sort of adapter or converter.

No immediate answer without more information.

Do you have the User Guide/Manual for either device?

If not, go online and search accordingly.

Take a look at the possible connections and if the connection is not clear - update your post with more detail..




 
If your sub has speaker level inputs then use them.
If it doesn't then you can connect a speaker to line level converter to the speaker terminals. If you have A-B speaker terminals you can connect it to the B terminals. That way you can turn the sub off from the front panel of the receiver if you want.
 
Solution