Thiele & Small Parameters (after 24hrs Break-in)
Out of concern, I contacted Madisound about this discrepancy but their Customer Service personnel by the name of Brian was less than helpful. Instead of addressing my concerns, he in fact implied that I do not know how to measure the Thiele & Small. Even tried to gaslight me by saying: “Berger, a beloved engineer at Scan-speak, was aware of the problem and was designing a program to unify the different measurement types, but unfortunately he passed away before finishing it. We have actually gone through this many times ourselves. People would send back drivers they measured on milli-volt systems saying they were out of spec. We would burn them in and measure with Audio Precision to find they were very close to the factory specs. Many of those drivers were Scan-speak, so they are ones that show a pretty large difference.” That’s a load of BULL-SHIT if ever there was one. I made it clear that Thiele & Small measurements are small signal. One obviously need to use a large signal for breaking the woofer in but when it comes to measuring Thiele & Small, it’s small signal. Just for the record, I have DATS as well as the industry’s standard, LMS by Linear-X. And if that is not enough, I also have Audio Precision. I would like to know what Scanspeak and this Madisound clown did to magically reduce a Qts from 0.7 to 0.35. Here’s a Scanspeak PL18WO-06-08 which I own. Notice how close the T/S from Scanspeak and my DATS measurements are. In fact, they are almost identical. Both Qts are at 0.34. And this is from the same company – Scanspeak. Scanspeak Thiele & Small Parameters
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November 4, 2023Drivers Thiele & Small, HIFI DRIVERS