Hey I’m trying to install a audiopipe equalizer. The equalizer has sub outs front and rear outs main and aux in. My head unit has sub outs front and rear outs. I’m wiring a set of rcas from the front pres to the main in on the equalizer. Then the front and rear out on the equalizer to my 4 channel amp.that all works fine. It’s when I run the rcas from the subwoofer out on the equalizer to the monoblock I get no signal. I need help