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Reply to "ERR Sound Commander, not that loud"

gunrunnerjohn posted:

I personally wouldn't push the amplifier on the RS Commander that hard.  While they have it running a 4 ohm load, the power dissipation goes WAY up, over twice what it is for an 8 ohm load.  That tiny chip can't really dissipate well over a watt without significant heatsinking, and it has none.  You're playing with fire running this with a 4 ohm load.

John,  wondering. Do you think if heat sink fins were added to the top of that chip it would make any difference. Not the same as conducting the heat out through a metal lead but still able to move some heat away.  I have some experience in a similar situation with a film scanner.  The Minolta Dimage Scan MultiPro is a high end medium format film scanner long out of production. Many of them died an early death due to the chip (TI- TSB41AB3) that drives the FireWire port dying.   So with no factory provisions to cool the chip when we replaced the chip we also fashioned small copper fins and epoxied them on with JB weld, thinking the metal filled epoxy would conduct heat better than plain epoxy.  The owners who added the fins when installing the new chip have had no failures since adopting the strategy about ten years ago.  I'm convinced it is working to the degree needed for that application.    j

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