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    PS audio explain how spike at bottom of the speaker works

    Hi folks, PS audio Paul McGowan release the video explaining how spike at bottom of the speaker works. Honest speaking, I don't buy it. My living room has a solid concrete floor and how can a speaker shake the floor and been isolated when the spikes are used. For me, the speaker shall stick...
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    Why speaker impedance have a peak around cross over frequency?

    When I look at speaker impedance graph, interestingly, I found a lot of speakers having impedance peak around crossover frequency. Take focal 906 measurements by @amirm for example. There is a peak around 2.5khz. I understand that tweeter have a high pass filter, while the woofer have a low pass...
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