Most automotive alternator/battery supply systems simply lack the capability to produce large amounts of power an amplifier craves.  Weather the amplifier is a sound system or a linear type.  Capacitors work by storing energy and then very quickly releasing this energy, on demand, to your power amplifier.  The result is tremendous punch and dramatically improved
voltage stabilization while filtering out unwanted AC noise caused by your engine or alternator.

Recommended applications are 1 Farad of capacitance per 1,000 watts (1 kW) of continuous amplifier output power.

Capacitors can be wired in parallel to increase value and power storage.

These stiffening capacitors are very simple to wire.  There is a Positive (+) connection and a Negative (-) connection.  The Negative connection connects to chassis ground and the Positive connection connects to your vehicles Battery (+) post.