Hook up sub no speaker level no rca output

How do I connect a powered sub-woofer to an older two-piece (amplifier & tuner) with no pre-amp output? The amp has no pre-amp, the sub has no speaker level inputs. I bought this setup from someone who had it all hooked up together. We just unhooked it, I never checked out how he had it hooked up. When I got it home, I can't figure out how it could have possibly worked. So the amp has no pre-amp output and the sub has no speaker-level inputs, can I make some kind of wire, or is this impossible? I saw it running, it worked for someone...but he moved out of the country is why I can't ask him! Thanks!!
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More about hook speaker level output
  1. you need a speaker level to preamp convertor.

    something like this:
    http://cgi.ebay.com/PAC-SNI-15-HI-LOW-CONVERTER-SPEAKER-LEVEL-RCA-PREAMP-/270477863822?_trksid=p4340.m263&_trkparms=algo%3DSIC%26its%3DI%252BC%26itu%3DUCI%252BIA%252BUA%252BFICS%252BUFI%26otn%3D15%26pmod%3D170477434803%26ps%3D63%26clkid%3D1749507696415669987

    or this:
    http://cgi.ebay.com/NEW-HI-LEVEL-LOW-ADAPTER-SPEAKER-CONVERTER-RCA-HIGH-/280715133631?_trksid=p4340.m263&_trkparms=algo%3DSIC%26its%3DI%252BC%26itu%3DUCI%252BIA%252BUA%252BFICS%252BUFI%26otn%3D15%26pmod%3D170477434803%26ps%3D63%26clkid%3D1749508190017789441

    or this:
    http://cgi.ebay.com/Car-Radio-High-Low-Speaker-Level-Rca-Converter-2-Amp-/330537010332?_trksid=p4340.m263&_trkparms=algo%3DSIC%26its%3DI%252BC%26itu%3DUCI%252BIA%252BUA%252BFICS%252BUFI%26otn%3D15%26pmod%3D170477434803%26ps%3D63%26clkid%3D1749511872073819854

    or this:
    http://cgi.ebay.com/SPEAKER-WIRE-RCA-HI-LOW-ADAPTER-CONVERTER-LINE-OUT-/390335418299?_trksid=p4340.m263&_trkparms=algo%3DSIC%26its%3DI%252BC%26itu%3DUCI%252BIA%252BUA%252BFICS%252BUFI%26otn%3D15%26pmod%3D170477434803%26ps%3D63%26clkid%3D1749566210210630800

    or this:
    http://cgi.ebay.com/HI-LOW-ADAPTER-SPEAKER-CONVERTER-RCA-FACTORY-RADIO-/280715140227?_trksid=p4340.m263&_trkparms=algo%3DSIC%26its%3DI%252BC%26itu%3DUCI%252BIA%252BUA%252BFICS%252BUFI%26otn%3D15%26pmod%3D170477434803%26ps%3D63%26clkid%3D1749565120661474024

    or this:
    http://cgi.ebay.com/Pyle-2-Channel-Speaker-RCA-Hi-Lo-Level-Converter-New-/230561381932?_trksid=p4340.m263&_trkparms=algo%3DSIC%26its%3DI%252BC%26itu%3DUCI%252BIA%252BUA%252BFICS%252BUFI%26otn%3D15%26pmod%3D170477434803%26ps%3D63%26clkid%3D1749569021248662534
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