Okay so I searched all over the Web for the resonance frequency of my car speaker so I can properly apply crossover filters, but didn't found any reference of the resonance frequency of this speaker model.

So how can I calculate it?

I have the following data:

Peak power: 150w Rms power: 20w Response Frequency: 90Hz-20kHz Sensitivity: 91db/W/m 4 ohm

Thank you in advance!!

  • \$\begingroup\$ There are many resources online that detail this process (simply search "finding speaker resonant frequency"), but briefly: you can use a waveform generator and oscilloscope to measure voltage across the speaker as a function of frequency. \$\endgroup\$ – uint128_t Dec 4 '16 at 7:18
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    \$\begingroup\$ Disconnect Amp. apply 9V on off and record thump wave then analyze using Audacity >tools>spectrum analysis. That is it. also if you don't know impedance, measure DCR and approximately double that. \$\endgroup\$ – Sunnyskyguy EE75 Dec 4 '16 at 7:39

You cannot CALCULATE Fs, (Resonant frequency of loudspeaker moving mass in free air). But you can MEASURE it relatively easily. You will need a power amp, a variable frequency source, and a DMM. THere are many resources online for measuring driver characteristics. Fs is one of the primary measurements for the popular Thiele/Small parameters. Here is one straightforward explanation:

Ref: https://sound-au.com/tsp.htm

  • \$\begingroup\$ Thanks for your answer, actually that's too hard for me lol. I will instead contact the manufacturer and ask them about the speaker Fs :) \$\endgroup\$ – TiagoM Dec 5 '16 at 1:00
  • \$\begingroup\$ I though there was a simple math that could give me Fs. Thank you very much! \$\endgroup\$ – TiagoM Dec 5 '16 at 1:01
  • \$\begingroup\$ To be fair @RichardCrowley: I'm sure you can calculate Fs, it's just much easier to measure it. \$\endgroup\$ – Bryan Boettcher Feb 2 '17 at 17:33

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