Did your setup and found that the top channel MUTEs then when sub gets overly drastic, Ch2 pops out of Ready mode! Unfortunately, I was not able to get the SHORT2 message but I get the point. (Note: You may have a problem with the Tracker circuit. Or, you really have a low impedance load on Ch2! I was using 4 ohms loads (not speakers!))
Did another test using same setup but no loads and unMute Ch2; Cranked up the signal until Peak indicators flash (a lot!); Bring down the signal; The amp shuts down! Bizarre...
I will advise Crown on this behavior. Thanks for your patience, ozob!
Basically I just copy/pasted the procedure I first posted on 10-2011, that I knew would demonstarte problem. The specifics of seeing malfunction are related to drive level and resonances/sensitivity/positions of speakers, etc. So problem MIGHT be harder to notice sometimes. In my case I did not have to clip or drive into protect - or do anything special really. Just lucky, I guess.
However since that time - and playing around - I have found a very easy way to demonstrate issue.
I am convinced problem is related to back emf on a muted channel. Here is an easy way to see the basic behavior:
Just plug in a monitor wedge to each output channel. DSP off. No special settings needed. Set the wedges on the floor literally faceing into each other a few inches apart. Play music to both channels and mute one channel. Adjust drive level and BINGO - amp reads "SHORT" and muted channel turns itself back on.
Certainly not a "real world use" but just to show what can/does happen when conditions are enough to produce sufficient back voltage on a muted channel - that confuses the amp.
2 real world scenarios where this is a problem for me:
a. Trying to write presets for a 3-way system with xover, delay, eq, etc. Testing and measuring response one passband at a time, thus muting sections and driving others alternatly. Pretty frustrating when passbands randomly turn themselves back on!
b. Set up show with floor wedges on floor next to FOH subs. Band goes on break - mute monitors - play break music and get, "Hey dude, the monitors are still on"!