Damping factor on an amplifier DOES NOT equate to better cone control, tighter bass, or better sound quality (Ess que) contrary to what many have heard. Also, the higher the number doesn't always necessarily mean the "better" an amplifier is, especially in the 12 volt world. Damping factor in the car audio world was a spec contrived by someone's marketing department and continued on through the decades with the bigger number meaning the better the amp.
I am trying to find the clinical trials that blew this myth, and I am having a hard time locating it. Regardless, if the damping factor is greater than 50, chances are one will NEVER hear the difference.
ETA: I forgot the biggest boo boo. In the past, some of the amplifiers with the highest damping factors used to cheat. They rated them at the circuit board instead of the speaker leads or terminals just so they could post a bigger number.
I have more misconceptions, but I want the collective to chime in on things such as slew rate, stiffening capacitors, THD, etc.