Vintage Home Stereo Reciever

[VintageNewby]

I have a Vintage Sony Reciever from the 70's, it does not have any RCA inputs for a powered sub. I only have two bookshelf speakers for now but would like to add a few speakers and a powered sub. The powered sub would have RCA jacks; how can I make a powered sub work with just speaker wire terminals?

 

[VintageNewby]

It is a Sony STR-3800

 

[americanaudiophile]

You can use an adapter like this one:
http/www.crutchfield.com/p_142LOC80/Scosche-LOC80.html
You can use the same set of terminals as the main speakers or the speaker B terminals.