I have seen comments recently on the T/S parameters being off on SS drivers, some in the Ardent thread and elsewhere. I found this also a year ago when I first tested my 26W/8867T00 and found the T/S parameters quite different from the manufacturer. I emailed SS questioning this but they never responded. Since then I have seen tests by Zaph and Troels of the 22W paper and Aluminum and they differ as well. Seems quite common with SS drivers...why I don't know.
Anyway I decided to try bucking magnets to see what affect it may have and it is quite surprising. I tried one and two additional magnets. Below is a pic with two magnets.
Here is actual testing in a 65l box.
The result of the standard 26W vs the 26W with (2) 120mm magnets added.
Here are the T/S comparisons using SoundEasy.
I tested the standard 26W using numerous methods and although the parameters changed between methods, the in-box simulations among the different methods were close as expected but not very close to the simulations with the standard SS data. With the added magnets the in-box simulation are very close.
To me it just seems that some SS drivers do not have the same magnetic strength as the prototypes or in the original design. Everyone should definitely be aware of the variability on the T/S numbers.
One thing that sparked my attention was the 26W/12867T special at Madisound. If I had to guess I think those T/S numbers are pretty accurate.
Anyway I decided to try bucking magnets to see what affect it may have and it is quite surprising. I tried one and two additional magnets. Below is a pic with two magnets.
Here is actual testing in a 65l box.
The result of the standard 26W vs the 26W with (2) 120mm magnets added.
Here are the T/S comparisons using SoundEasy.
I tested the standard 26W using numerous methods and although the parameters changed between methods, the in-box simulations among the different methods were close as expected but not very close to the simulations with the standard SS data. With the added magnets the in-box simulation are very close.
To me it just seems that some SS drivers do not have the same magnetic strength as the prototypes or in the original design. Everyone should definitely be aware of the variability on the T/S numbers.
One thing that sparked my attention was the 26W/12867T special at Madisound. If I had to guess I think those T/S numbers are pretty accurate.
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