No one, including me, stated a vehicle was an echoic chamber. The assertion that testing in an anechoic environment to begin with, is somehow irrelevant or unsubstantiated to achieve solid results and the effects of beginning with the best design you can afford is beyond rational thought, and nothing more than rhetoric over issues you don't understand. and to play the subjective card of a/b listening tests is just as irrational. It's just that simple.I'll state this... I'd be willing to bet that I could predict the results of someone in an a/b/x listening test where they are subjected to a subwoofer amplifier with a damping factor of 50 and a damping factor of 100. Out of 100 people, 98 of them wouldn't be able to tell which amplifier they were listening to based on damping factor beyond any statistical significance of guessing. The other two outliers may be just that dang good OR that dang lucky. Regardless, chances are anyone reading this thread will be in the 98 people group who won't be able to tell, yet most will think they are the golden ear two without being able to tell yet alone repeat the results.
Now let's take this further with a car amplifier, where the damping factor spec used to be cheated by being measured at the circuit board, versus at the speaker leads, yet alone the speaker itself. Yeah, good luck with that spec making a huge difference in SQ when you don't even know where it is measured.
Back to my original comment when it comes to cone control, a properly designed and implemented servo will beat damping factor 7 days a week and twice on Sunday! It should also reduce subwoofer induced distortion from the cone movement itself. I was told that the Velodyne car audio servo subwoofer was one of the best, but they failed to take one variable into consideration with the cone position sensor.... The movement of the vehicle itself. It was great for an SQ competition, but in some instances, results could vary once the vehicle was in motion. Oddly, this was vehicle dependent as I knew two different people who used this setup and one claimed it was fine with the vehicle still or in motion whereas the other one said it only worked in his trailer queen SQ vehicle and driving made the sub vary...
Which brings me to my next point. We are talking about CAR AUDIO here, which is generally the absolute worst reproduction environment that anyone could ever want when it comes to audio... At least modern day digital processing is making it better for multi-listening positions and imaging, to some degree. Good luck getting your anechoic chamber response in a vehicle.