1) Under what situations
While starting the car's engine. Can't remeber exactly if it mattered if empeg was on or not. Bacause of the pops I developed the habit to insert the empoeg only once the engine was running, until last week . . . . I forgot to remove empeg when the engine halted. Started the egine, and since then the amp is dead. Funny enough, there was no last pop.

Had had a dead amp before. Previously it came back to life after some 5 minutes.

2) (MOS)FET
Mine is (was ) a MOSFET type amp

3) Model / make
Make: Rockford Fosgate
Model: Punch 240.4

4) URL
http:// http:www.rockfordfosgate.com
there are no data sheets for this model on their site, I believe. There is a PDF manual: fisrt item (manual for 160.4 and 240.4 models) here

Henno