I have installed my system today (with help): FS system via crossovers on channel 1u.2 Sub-rigged on 3+4 The connections are OK From the radio a cinch cable(+/-) goes to the amp(GZ HA4150x). But at the amp there are for the 2 cinch cable 4x line(1,2,3,4) in and 2x line out! No matter how I connect the thing, there are only 2 of the 3 things!Either sub+ 1fs or both fs. Do I just need to make a y-adapter to 2 cinch 4?? I don’t have a plan what I could do.