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<blockquote data-quote="bbeljefe" data-source="post: 8256187" data-attributes="member: 655960">There is a variety of reasons why the subwoofer amp hasn&#039;t overheated yet and the key term is yet. First, you may not be driving the subwoofer amp as hard as the 4 channel, relative to it&#039;s capabilities. Second, it may have more efficient cooling. Third, the gain may be too high on the 4 channel. Fourth, it may be getting a bit better ventilation than the 4 channel, even though they may be side by side.But regardless the reason, you should never run amps upside down without additional cooling. Car audio amps are pretty much all designed with the heat sink above the PCB and that&#039;s no accident. Heat rises and the heat sink&#039;s job is to catch and dissipate that heat. When you mount the amp with the heat sink below the PCB, all that heat builds up at the bottom of the amp where there is no sink to get rid of it and eventually, the amp will overheat and possibly, die.</blockquote>

[QUOTE="bbeljefe, post: 8256187, member: 655960"] There is a variety of reasons why the subwoofer amp hasn't overheated yet and the key term is [I]yet[/I]. First, you may not be driving the subwoofer amp as hard as the 4 channel, relative to it's capabilities. Second, it may have more efficient cooling. Third, the gain may be too high on the 4 channel. Fourth, it may be getting a bit better ventilation than the 4 channel, even though they may be side by side. But regardless the reason, you should never run amps upside down without additional cooling. Car audio amps are pretty much all designed with the heat sink above the PCB and that's no accident. Heat rises and the heat sink's job is to catch and dissipate that heat. When you mount the amp with the heat sink below the PCB, all that heat builds up at the bottom of the amp where there is no sink to get rid of it and eventually, the amp will overheat and possibly, die. [/QUOTE]

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