I have an Beta 202 enclosure . Speakers are Sunn Transducer 128G-SP . Impendance 8 ohms . Power rating 60 rms watts . System impendance 4 ohms . Max pwr. input 100 watts .There are two output jacks . One says parallel the other series . There is a third jack for input . There are no wires leading to it . Also input jack has three wire connectors . I'm not sure what the third connector is for . Each speaker is wired to output jack separately . How do I wire this the right way .