Get a reciever that can handle more speakers. There is 5.1, 7.1, 7.2, 9.2 & 12.2 recievers out there.
I have a newer Harmon Kardon audio receiver/amp. 120 watts, 2 channel audio (I guess is the term - has "speakers 1" and "speakers 2") I have a speaker on each post of the four - and want to know if I can add another pair or two of speakers, piggy backed on to the existing ones without frying the amp.... can I get away with it safely? If not, whats my option to add two pair of speakers?