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Has someone in this thread, or anywhere else, ever bothered to place a microphone at the port exit, perform a near field measurement, and evaluate frequency response and decay charts, to verify KEF's flexible port resonance absorption claims?
Has someone in this thread, or anywhere else, ever bothered to place a microphone at the port exit, perform a near field measurement, and evaluate frequency response and decay charts, to verify KEF's flexible port resonance absorption claims?
I don't see nearfield measurements for this particular KEF model, but they've been done for other KEF models (here, at Erin's Audio Corner, and at Stereophile).
Port resonances are usually several hundred Hz to 1-2kHz. With a three way speaker such as this one, port pipe resonances generally aren't as big of an issue as they can be with two-way speakers, because the woofer/port system is lowpass filtered such that content that might otherwise trigger a resonance is not even getting to the woofer/port.
With two-way speakers, where the woofer/port gets content up to around 2kHz, it can be a bigger issue.
But there are many other speakers that don't use KEF's technology but still have well-controlled port resonances. So there's more than one way to attack the problem.
Thank you. That's what I was looking for. Resonance peaks are down ~15-20 dB from the tuning (fb) peak for these two speakers, which, I agree, is a good value.