Piggy back conditioners?

I have 2 Audience conditioners. One is the original 12 and I just bought the 6,t version. Just looking for suggestions here. I do HT as well and some items are further away from the 12. I don't use either for my amp. Could say one plug the 12 into one of the outlets of the 6 ? Or should it be the other way around?? Or not at all? Since the 6 arrived it has only been used for my plasma, and quite an improvement I must say. Like having your cake-- I would like to keep the tv on the 6 t. So does having the 12 plugged into the 6 improve the 12?? or not.-?? I would guess I never draw the 1800 watts---one 20 amp line in an apt.allows.