Best Sounding Adapter - Making RCA into Banana or Spade? Thanks!

The cable will connect an integrated amp (banana or spade) to a subwoofer (RCA).   The cable is RCA both ends.  I want to avoid cutting off the RCA at one end and so use a banana / spade adapter. Thank you for your help :-)

You could get a line out converter if you want to take speaker level signal; Or a line out attenuator, fixed or variable, if you want to take signal from line level. Try Amazon or Crutchfield.

Why not just just use  RCAv Y connectors from the integrated to the sub?