sounddigital 12000.1d evo passive cooling?

just a question about this amp, are these passive cooled? because after doing a simple cracked solder joint the fans no longer work. and iam thinking since they worked originally maybe theres a fail safe mode where it give max fan speed and now when everything is up and running it is waiting for a thresshold temp to reach?
 
So to answer my own question: yes it is and by heating the top right corner behind audio input with heat gun it kicks in.
 

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Hey! I run one in my comp car.

The SD12k is an extremely efficient amp, usually can be passively cooled until it’s put under a heavy load and the fans will ramp up accordingly.

It’s just like you said it takes some heat to get em going.

I usually only see fans kick on when doing 10k burps haha!

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