I have Infinity IL-60 for the fronts and Infinity IL-120s for the sub. The front speakers have separate input options for the sub( the built in sub) but I have selected the speaker option on these. Also on the sub I bring the L and R wires from the amp and then to the speakers. Is this good or I go with the subwoofer out option form the receiver and then put a Y connector to split the signal for the sub. somebody told me that if I separately wire the IL-60s and select the sub option the performance is better?