I know JL amps are under-rated. I have a JL 450/4 amp that puts out 150W RMS x2 @ 1.5-4 ohms/11-14.5V on the front channels stereo. how much power is she really putting out do you think?
well its really putting out 150watts.. lol.. that true power... its true power wiht a high dampening factor.. thats why those amps seem soo powerfull and soo efficient is the high dampening factor...
The damping factor is typically directly proportional to the quality/grade of the transistors used. I.e, the greater the DF, the greater the quality of the amp. It will tell you little else.
As far as so-called "amplifier sq" goes, if the DF is >20, it's considered audibly adequate. That is, you won't be able to hear a difference.