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noah katz wrote:
 How long was the time between sweeps, and was it consistent? It would affect voice coil temp and thus the amount of compression. |
The time between the sweeps was around 60 seconds. I didn't use a stopwatch to measure it, but it was fairly consistent. And actually it doesn't matter that much because at high output levels voice coil heats up really fast. I remember Dan Wiggins quoting that the VC in AA Tumult takes around 2 seconds to go above 200 deg. C with 1000W input power. So it doesn't matter that much whether the starting temperature is 30 C or 60 C.
Actually the heated up air inside the enclosure is a bigger problem. It would be interesting to measure Bossobass' "cooling system" to find out how much it actually helps.
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Actually, it takes one more derivative, called "jerk".
The best example is the constant acceleration of gravity.
Also notice that when taking off on a plane, the noticeable part is when the thrust is being increased, but when it reaches its maximum, it's less perceptible because it's constant.
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Yes, we do sense a changing acceleration better than a constant one. What I wrote is based on Mr. Geddes' research. IMO group delay is one of the least important variables in subwoofer's performance.