Estupendo! Mi idea para mejorar la ecualización de mi equipo es hacer eso mismo, entiendo que vas aplicando filtros al tiempo que ves el resultado en la gráfica del RTA, de modo que puedes ir aplanando la curva a ojo.
Al hilo de esto el otro día di con una página interesante sobre tonos para test (debe ser conocida): High Quality Pink Noise | wav mp3 Audio Files Download

Saco un par de extractos:
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For the human auditory system - which processes frequencies logarithmically - pink noise is supposed to sound even across all frequencies, and therefore best approximates the average spectral distribution of music.
In practice though, it turns out that our ears are more sensitive to certain frequencies, such as in the 2–4 kHz range. Pink noise, despite of its even frequency distribution in the logarithmic frequency scale, will therefore be perceived as colored, with a prominent peak perceived around 3 kHz. Flattening a noise in a perceptual way, will generate grey noise"

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There is nothing such as a unique grey noise. "Grey noise" is a generic term that stands for a perceptually-flattened noise. The flattening curve to be applied depends on the listener’s particular hearing thresholds and the sound pressure the grey noise will play at. Our ears are indeed extremely non linear, and the perception of the different frequencies depends on the overall loudness (the Fletcher-Munson curves). For example, at lower levels, the sensitivity of our ears toward the lower and higher frequencies drops drastically.
True grey noise doesn't exist, unless it has been created for your own hearing and for a particular sound level. myNoise.net is the only place on the Internet that implements a genuine grey noise generator, online, calibrated to your hearing threshold levels."

¿Has tenido en cuenta esa subida perceptual sobre 3KHz al usar ruido rosa para aplanar? ¿Conociais el ruido gris? ¿Os parece que esto puede tener aplicación práctica?
Yo visité también la página de myNoise.net ( https://mynoise.net/NoiseMachines/gr...eGenerator.php ) pero no se si tiene sentido generar mi propio ruido gris (que me permitiría aplanar en función de mis características auditivas), guardarlo y usarlo como tú has usado el rosa del REW ... creo que hay que pagar en la página para usarlo como un archivo.