21-Sep-2018, 01:57
(21-Sep-2018, 01:28)David A Wrote: Yes, no, maybe. Depends on how you look at it.
If you raise amplitude in the bass, you raise it across a range of frequencies. The less audible frequencies, lower ones where the speaker is rolling off, get raised as well as already audible frequencies and the higher of those less audible frequencies will become more audible.
BUT raising the amplitude of low frequencies also affects audibility because of the nature of our hearing response which rolls of more in the low and high frequencies as sound pressure level (amplitude) decreases.
You'll notice lower Hz frequencies as you increase the level in SAM but part of that is due to SAM and part of it is due to our own hearing response at low frequencies. I have no idea which is playing the bigger part but I suspect it may be our hearing response.
I suspect the phase correction also plays a part in the audibility of low frequencies. For example, a bass or electric bass has a bottom note of about 41 Hz but the first overtone at 82 hz can actually be as loud or louder than the overtone and will definitely be more audible. I wonder whether the phase correction results in the fundamental and overtone being reproduced in closer phase with each other which would mean that the overtone will gain some reinforcement and I have a feeling that some of our sense of loudness of low frequency notes is provided by the loudness of the overtone given that our hearing is less sensitive at the fundamental frequency.
I think there's a lot going on and, pardon the pun, some of it is in our mind, in other words some of the difference we hear is due to psychoacoustics and the way our hearing works.
Thanks, that clarifies it.
