Easy way How to install Amplifier Subwoofer connected into car stereo / radio cable / wire inputs, more bass for less space test out the Kenwood powered sub is top best amplified / sub combo unit for the buck, sub fits under driver seat with room to spare, it sounds close to 8" to 10 inch single sub, http://tampatec.blogspot.com/2014/09/how-to-install-amplifier-subwoofer.html
troubleshoot service guide -
if sound cuts in and out check ground wire connection,
if bass only works on am / fm check blue remote power control wire to radio wire harness it might be connected to power antenna,
power cuts off or fuse pops then connect amp's yellow battery wire straight to battery+
No power then check bad fuses, loose ground connection, batt. power wire connection to battery, and check remote p.cont wire is connected to proper remote amp power input on radio wire harness.
if humming or buzzing noises then move rca audio wires 1ft away from any amp power wires or use shielded audio cables.
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