hook your sub to the speaker wire, run more wire to the Def Techs from the high pass output on the sub, assuming it has them.
this will make your sub the bass speakers for your Def Techs
if you want the subs as the .1 in a 5.1 system, you will have to hook them up to the sub out of your receiver/pre-amp
this will make your sub the bass speakers for your Def Techs
if you want the subs as the .1 in a 5.1 system, you will have to hook them up to the sub out of your receiver/pre-amp