I posted a few days ago about connecting a vintage late 70s integrated amp to a subwoofer. I have to use a speaker line connection as the amp has no sub out.

I tried to connect today. Speaker wire from amp to sub and then from sub to speakers.

The result: Nothing. Except for faint base from sub. No sound from speakers and next to nothing from sub. When I turned the amp on in this setup, you can't even hear the power click that it normally happens.

Any ideas? Am i doing something wrong? Is the sub defective? Or as a guy that works on fixing older stereo equipment told me a few months ago-you can't connect your old vintage amp to a subwoofer? It won't work.