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SupOrSalad t1_iwvbilv wrote

The blue line is a fletcher Munson curve/equal loudness curve. It's an average measurment of human range of hearing for each frequency.

The curve isn't ideal for headphones or audio as a target, and also changes by listening volume and flattens quite a lot as the volume increases.

The only other person I've seen use the equal loudness curve as a target is nouvraught, although he would do it by first compensating the headphones FR to diffuse field first, and then comparing against the equal loudness curve... not that it's to be taken seriously anyway. As far as I know, it's mostly baseless methodology

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69001001011 t1_iwvlsyx wrote

The problem with the Fletcher Munson curve is twofold.

Sound engineers mix on neutral monitors, which have a very flat response. because of this they compensate for human sensitivity in the 5k region by dropping it down naturally.

The second problem is that by definition the Fletcher Munson curve changes with volume. So equing to it only works at 1 specific volume. The real way to compensate for it is with loudness controls, which boost the bass and treble at low volume.

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