I have 2 za3 were the inputs are daisy chained, so they play simultaneously. At each amplifier I have a set of speakers, which I want to use together or separate. But I only have 1 subwoofer, if I daisy chain the sub outputs to my single sub input, the cancel each other. I use an Y splitter. To make it work I have to remove one of the plugs of the nog working amplifier. Anyone a "easy" solution?