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mvw2 t1_j5rs3zn wrote

Isn't it nicer to see a full spectrum waterfall plot for decay?

For example, at what frequency is this? Or is this like the aggregate average?

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SupOrSalad t1_j5ru9bq wrote

Waterfall plots are misleading when it comes to headphones, since headphones are mostly minimum phase, the "decay" from a Waterfall plot is directly linked to the FR. You can see this if you EQ the headphone or just shift the headphone on the measurment rig so the FR slightly changes, the "decay" will also change equally with the FR change.

Waterfall plots are designed for speakers and room treatment, and they work for that since it's measuring in different conditions, but for use in headphone measurements they can be more misleading rather than helpful if viewed the same way as waterfall plots for loudspeakers

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MDZPNMD t1_j5vqy4o wrote

Waterfall plots are nice because you find out that the noise of your fan is ruining your measurements.

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The_D0lph1n t1_j5zdrq9 wrote

Is the decay linked to the absolute SPL at a frequency, or to the relative SPL of that frequency relative to the rest? If you EQ down a 6K peak by 3 dB to get rid of that decay trail, but then raise the entire signal level by 3 dB so that 6K is back at the original SPL, does the trail return? Does the rest of the signal now exhibit the same trail?

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lorentz_217 t1_j5zfnpl wrote

Well I don’t know much abt this specific graph but an impulse response will contain a lot of frequency components cuz the shorter a pulse gets (hence the impulse) the wider the bandwidth of the signal (you can think of it like a bunch of sine waves at various frequencies adding up to create the pulse, this is just a Fourier series). But yeah that’s the cool science part, I don’t get the utility of the impulse response for headphones either

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