Question

Can't find T/S for Two Speakers

Hello, could you please help me finding the T/S Parameters for the speakers - pictures bellow. I have two speakers, the only thing I know about is the Serial Number or Part Number. The bigger is FSF06401C-01 and the smaller is ESB545017-1808. Do you guys Know where to find their parameters. Thank you!

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The best solution for you is a calculation of the parameters using tools (for example from Dayton). Try to find somebody in your region who has such tools and can help.

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Thanks for the answer. I was thinking about that. But I didn't found anybody yet, still searching. I tried this DIY solution https://www.youtube.com/watch?v=nKNx7UFyIwA using Room EQ Wizard (https://www.roomeqwizard.com/). But I got some weird values, i don't know if they are right. I used the added mass method, in both I used 16g. Do you think they make sense? Bellow are the values:

For the fsf06401C-01 (diameter = ~2.5") got:

  • Zmin 6.09 ohm
  • fmin 374 Hz
  • f3 4363 Hz
  • Le(f3) 0.156 mH
  • Motional impedance parameters
  • R0 7.42 ohm
  • CMES 684.2 uF
  • L0 1.554 mH
  • beta 0.0161 
  • omega0 1444.5 
  • Blocked impedance parameters
  • RDC 5.90 ohm
  • dR 0.04 ohm
  • Re 5.94 ohm
  • Leb 41.0 uH
  • Le 0.280 mH
  • Rss 100000.0 ohm
  • Ke 0.0336 S-H
  • Thiele-Small parameters
  • fs 153.6 Hz
  • Qms 4.897
  • Qes 3.923
  • Qts 2.178
  • Fts 70.5
  • Mms 3.54 g
  • Cms 0.304 mm/N
  • Rms 0.697 kg/s
  • Vas 0.34 litres
  • Bl 2.273 Tm
  • Eta 0.03 %
  • Lp (1W/1m) 77.08 dB
  • Dd 6.00 cm
  • Sd 28.3 cm^2
  • Added mass measurement: with mass 16g Apr 10
  • Added mass 16.000 g
  • Air temperature 20.0 C
  • Air pressure 1013.25 mB
  • Air density 1.2041 kg/m^3
  • Speed of sound 343.2 m/s

for the esb545017-1808 (diameter = ~1.5") got:

  • Zmin 4.69 ohm
  • fmin 3139 Hz
  • f3 13865 Hz
  • Le(f3) 0.042 mH
  • Motional impedance parameters
  • R0 0.35 ohm
  • CMES 303.2 uF
  • L0 0.019 mH
  • beta 0.0000 
  • omega0 19135.3 
  • Blocked impedance parameters
  • RDC 4.10 ohm
  • dR 0.10 ohm
  • Re 4.20 ohm
  • Leb 15.5 uH
  • Le 0.066 mH
  • Rss 100000.0 ohm
  • Ke 0.0152 S-H
  • Thiele-Small parameters
  • fs 2083.6 Hz
  • Qms 1.375
  • Qes 16.687
  • Qts 1.271
  • Fts 1639.9
  • Mms 0.12 g
  • Cms 0.047 mm/N
  • Rms 1.177 kg/s
  • Vas 0.01 litres
  • Bl 0.639 Tm
  • Eta 0.29 %
  • Lp (1W/1m) 86.81 dB
  • Dd 3.40 cm
  • Sd 9.1 cm^2
  • Added mass measurement: with mass 16g tweeter Apr 10
  • Added mass 16.000 g
  • Air temperature 20.0 C
  • Air pressure 1013.25 mB
  • Air density 1.2041 kg/m^3
  • Speed of sound 343.2 m/s

That's hard to say :) Consider the sizes of your drivers it looks like true.

hm... ok, thanks a lot giving your opinion and for helping! At least now I have something to calculate the box. The only thing bothering me is the Qts value, I think it is way high than I expected. Do you think they are ok?

I tried out this (of course I read the text first really carefully to not miss nothing): Measuring the loudspeaker parameters (tksoundworks.com) . It worked for me - even with on Windows 10 laptop which have a sound card with classical 3.5 mm jack stereo sound output, and 3.5 mm jack stereo microphone input - of course with a measuring cable I made myself by the first picture on the website. Of course, I broke in the speaker first. After measurements I copyed the measured parameters in a speaker designer software (BassBox Pro, or WinISD) firstly to let the software to count out or estimate the other missing parameters. I used 20 g weight which gived me frequency shift which is between the recomended 20-50 percent frequency shift, but you will need to find a weight (maybe will be different for both speakers) which will give you that 20-50 percent frequency shift on your speakers...so, for example, this is my measurement: https://drive.google.com/file/d/16F9E5f2T5apPrx45bLV69EfmyUqs50Ct/view?usp=sharing .

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