It's a Bolt 4 ch amp by lightning audio and the problem I'm having is the amp has 4 pre-amp outputs and i've got one set coming from the deck.How or what do I need to do to get all 4 channels operating?I plug in the one set and 2 channels are on,vice versa with the other 2 channels but how do I get all 4 channels going?Is there some type of splitter that I need?