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Message: <blockquote data-quote="goblues38" data-source="post: 1531124" data-attributes="member: 29724">Couple things....#1...size of the amp has zero to do with it.  How well the amp is made / engineered has a lot to do with it.  Many amps, especially less expensive amps, only dissipate heat when mounted in a specific way.  The way your amp is mounted may not be directing the heat to the heat sinks in the map.#2.... incorrect power and ground wire gauge  can impact efficiency of the amp.  The ground is actually more important than the power wire in many ways.  Think of a restricted muffler and an engine.  The power wants to complete the circuit, and if your ground is providing more resistance than your power, heat builds up where the work is being done.#3.... load...some amps claim to be 2ohm stable, less expensive amps will only run 2ohms for so long before they get too hot.For what its worth, my JL Audio RD900/5 is 75x4 @ 4 ohm and 500x1 @ 2 ohm.  It will run all day long at 11 on the volume dial and never get close to thermal shut down.Proper system design goes a long way.</blockquote>