Here is the situation, amp is irrelevant, here is the scene-
Stock alternator, car on, over 14v at idle, starting battery up front, XS D3100 batt in the back(reads 13.0 float), so i gots plenty of battery power for this amp which requires a 200A fuse.
I start to oscope the amp on a 48hz tone set to repeat.
Every now and then, there would be a "THUD" sound that would quickly come from the amp. Unknown as to why but we continue to scope anyway. I do not know if it's relevant or not.
Anyways, subsonic set to off, LPF set all the way up, bass boost OFF, phase 0, gain - all the way DOWN.
All settings on HU were flat, sub preout set to 15, Kenwood HU. Volume goes to 35.
I start the scoping process-
I want the user to reach a volume of 27 before i start turning up the gain.
Once he reaches approximately volume 20-22, this amp audibly appears to be outputting some decent serious power considering the gain is all the way down!
Once the volume is adjusted just a couple more notches, not even reaching 27 yet, here is what i know-
Voltage output on speaker leads- 28.5-28.7v (rated at 1.8kw@1ohm so not all the way there yet)
Sine wave on scope was still 100% clean.
immediately there was a "click" inside the amp as if something was switching then immediately smoke poured out the speaker wire\power\ground side.
The amp was extremely hot on the power\ground side.
Amp was taken apart and here are the pics-
Before i show pics, there was a chip that was cracked with model number - KIA494AP = Korea Voltage Mode PWM module Controller is what i pulled from it.
that and multiple FETs are fried, here are pics-
And of the Chip, looks like a resistor got fried too-