Hi, first time poster here. I wasn't in the market for a audio system, but I was walking around the fleamarket checking out stuff and I ended up buying this Kicker sub and Jbl amplifier that was screwed onto the enclosure for $30. Anyways, I'm a little confused about the terminals on this JBL amplifier, mainly the four input/output sockets. Right now I currently have the right side input/output plugged in and everything sounds good, but in the manuel I downloaded for the JBL amp, it's saying something about having all four input/output terminals plugged in and I really don't understand it. Any feedback on the correct way to hook this amplifier up will be very much appreciated.

SPECS
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JBL Power Series BP-1200.1

RMS Power into 4-ohms: 600 watts

RMS Power into 2-ohms: 1200 watts

RMS Power into 1-ohm: 1200 watts (no increase in output power below 2-ohms)

Peak Power: JBL does not specify the peak power capabilities of this amplifier.

Kicker Solo-Baric L5

12" subwoofer with dual 4-ohm voice coils

power range: 50-600 RMS watts (300 watts per voice coil)peak power: 1200 watts