[runeks]

I’ve tried this for my speaker setup. And the problem is that the frequency response is a function of volume. For example, the louder I play music the more the bass is accentuated. I think this is because of standing waves.

So the problem I find is that when the volume is low the bass is too low, and when the volume is high the bass is too loud. Only when I play at the same volume as the equalization was performed at do I get a good result.

[fhchl]

This is a common psycoacoustic effect and probably not due to the loudspeakers or the room acoustics (which are linear): the (perceived) loudness of a tone is frequency and level dependent [1]. This makes sounds more bassy at large sound pressure levels.

[1]: https://en.wikipedia.org/wiki/Equal-loudness_contour

[ttpphd]

Loudness is also distance dependent, as in, not just how far away the sound source literally is, but how far away you think it is.

[newaccount74]

Some hifi systems have a "loudness" setting that raises bass+treble to compensate for this effect at low volume.