Which TSP should i use?

[e-side]

Hello,

A year ago i bought two 300mm woofers. I used the manufacturer's thiele/small parameters:

Re = 7,1 Ohms
Fs = 29 Hz
Qms = 1,62
Qes = 0,71
Qts = 0,49
Vas = 129 L

I designed a closed box with WinIsd, and they did sound fine.
But now I would like to use these woofers for a subhorn, and therefore i measured the Thiele/Small parameters myself. The results were quite different:

Re = 8,2 Ohms
Fs = 33 Hz
Qms = 2,94
Qes = 0,87
Qts = 0,67
Vas = 112,1 L

Should I use my own measurement results or the manufacturer's?
I measured 4 times, and every time i got the same results. But the closed box based on the manufacturer's tsp did sound well...

Thanks in advance.

E-Side

[MJK]

Use your measured results. Manufacturer's results are not always accurate, typically stated values of fs and Qts are lower then reality.

If you recalculate the properties of your existing speaker design with the measured T/S parameters, you can assess how far off the actual design was from the intended design. Just because the results were not as you thought, does not mean that the design would necessarily sound bad. I think sometimes people put too much emphasis on the numbers (I guess that sounds funny coming from me).

[e-side]

Thanks a lot MJK!

E-side