I seem to have 4* S cables with my DSP 3100 speakers.

I need to re-solder them according to the wiki: http://www.meridianunplugged.com/wiki/uploads/5serleads.pdf

I think i just ask the dealer to supply me the right cable and take back the wrong cable. (got these when i bought the speakers with a AC-11)
A BNC will work as well ?

Sold all M equipment