Re: Why Do TEF Systems read 3-5 dB high ?
As stated-at the NY shootout, the drive voltage was really unknown. There were a couple of different VOM's there, and they all read different, so we had no idea what the drive voltage actually was. But what was important is that it remained the same during the testing-so the results were comparative-if not absolute.
There have been 2 versions of the TH215's. The earlier version-as at the nY shootout, had a lower sentivity, but a higher power capacity. The later version had a higher senstivity, but a lower power capacity. The net result was pretty much the same.
The TH115 had also had 2 different drivers in it. Well the same drive-but the standard impedance was different. At the NY shootout, the 8 ohm version was present. A couple of years later the "standard" was changed to the 4 ohm driver-due to overwhelming customer requests.
I have not had any other standard production subs in the shop and had any time to measure them side by side. If somebody wants to bring some up-they are more than welcome and we can test them and see where everything stands.
But I don't think there is any error in the TEF measurements.
At the Baltimore shootout, Smaart was used (although uncalibrated) and the results were pretty much comparitive to published specs-if I remember correctly.
I don't know what your second graph (the blue one) is or what the conditions are. THe numbers are way off.
