4. Providing the brain-rattling audio, we called up Kicker and after speaking with a very helpful customer service agent, we ordered four amps, including an IX500.1, an IX500.2, an IX500.4, and an IX1000.1. For speakers we ordered a set of KS60 6-inch coaxials, a set of 6 1/2-inch two-way components, and a set of KS69 6x9-inch coaxials. For the beats, an S8L7 8-inch sub and two S10L7 ten-inch subs were ordered. We also ordered all of the wire and fittings necessary for the install from Kicker.