Originally Posted by neutro
Well of course not. If you play flat down to 8 Hz but at 80 dB SPL tops, according to the graph above, you won't perceive anything below about 15 Hz.
Agreed, but the sound engineers have already EQ everything sonically flat. This phenomenon has already been corrected for. If you're flat, you're reproducing what the sound engineers wanted you to hear. In short, you're golden. If you jack anything up, then your outside their purvey which isn't a crime, but in doing so, nothing is being corrected for other than the shortcomings of the subwoofer sound reproduction system.
Stating the obvious, that's what all those sliders on the sound board are for. They may have a smile shape on their sound board but to replicate what they recorded, the end user needs to have a flat response. And if one doesn't have a flat response, the end user is adding or subtracting away from what the sliders on the sound board represent.
As to 8Hz, assuming the driver is capable, that's an amplifier problem as it takes more energy to reproduce the lower octaves based on the demands of room acoustics and if the subwoofer isn't up to the task of integrating well with room acoustics then the end user has to acquire a subwoofer system that has the amplification necessary to easily handle 8Hz or one has to give up headroom and their expectations. Quid pro quo baby.
The point, the Phon Chart was taken into consideration at the time the tracks were laid down. And if the end user wants a system that's 8Hz capable, it's up to the end user to acquire a system that's capable of reference flat to 8Hz. And if they can't get a subwoofer system that's reference flat to 8Hz, then they're going have to expect to be disappointed.
Personally, we can only afford a system that when purchased, installed and EQ'd, will expectedly be reference flat to 12Hz and if I'm lucky will have usable 8Hz but I have no expectation of being reference flat to 8Hz. And I won't know how the system will perform within the confines of our room acoustics, due to the semi-open spaces at each end of our living room, until the system is installed and measured.
I'm not trying to be argumentative. I'm trying to support my comments and clarify the why of my comments to remove any misunderstanding. And if I've made errors or omissions, anybody is welcome to jump in and correct my comments as it's about accuracy and proper understanding of the process and the best I can lay claim to, is that of an incompetent old fool.