Speaker wiring question

Both the speakers and integrated were recently purchased (used) and I listened for a couple of hours again today this time connected to the low posts and things did  sound better but I also used different Interconnects and am wondering if that was the reason.  I'll continue to experiment and may give biwiring a shot down the road as well 

I would like to ask you proponents of bi wiring a question.  At what point along the run of speaker wire would jumping across to a second pair of wires constitute "bi wiring"?  Could I tap into the original pair at the mid way point, jump across to a second pair of speaker wires and continue on the the speaker terminals?  Would that be "bi wiring"?  At what point must a second pair of wires be introduced to be considered bi wiring, thus achieving superior sound?   

@metman :

"but I also used different Interconnects and am wondering if that was the reason."

Never change more than one variable at a time!

I wanted to use the same ones I used the previous time which happened to come with the integrated I just purchased ( Denon pma 2000 IVR - pretty impressive unit incidentally) but forgot where I put them and used my Morrow IC instead   They'll turn up and  Like I said I'll continue to experiment.  The speakers are Platinum Audio reference one's and very impressed thus far with these as well