Arguing with the people who think the term "infrasonic" is a myth is endless. For them to admit that their bank of 10 refrigerator-sized subwoofers, put in place in order to reproduce 10Hz and below at extremely loud levels serves no purpose if one limits one's exposure to reference level playback levels only
[and doesn't cheat by pegging the EQ up at 10Hz and below] is something they rarely concede.
Another issue is that hardly any of them [none that I know of] buy special, infrasonic capable measurement mics and instead they really on typical ones such as these:
Originally Posted by m. zillch
Some mics many people use for REW:
ECM-8000 according to marketers:
ECM8000 as measured. 85 of them overlapped:
. . . These curves show the raw responses of the mics themselves and none of them are adequate at 10Hz or lower, in fact the Umik is "off the chart" bad.
Let's say for argument they use one of these mics, above, and their mic is, let's say, exactly 5 dB down at 10Hz. Let's also assume they have a bank of subwoofers, each the size of a refrigerator, and through a superior calibration system [much more accurate than what they own, with a proper infrasonic capable mic good down to 1Hz or lower] they have a system capable of nearly perfectly flat movie sound reproduction down to 3Hz.
They now own one of the flattest ultra deep bass reproduction systems out there however their calibration mic is only, lets say, "consumer grade". What will their REW response graph show? Answer:
It will show their room response is 5dB down at 10 Hz, even though it actually isn't,
because their consumer grade mic is flawed and 5dB less sensitive at 10Hz than it is supposed to be [see the manufacturer's response graph above].
So what do they end up doing? Ignorant their measurement system is compromised, they jack up the 10Hz and below EQ so their inaccurate mic will show a flat response at 10Hz and below, yet in truth, if measured with a superior quality mic designed for infrasonic accuracy, such as a pricey B&K Type 4193
, they now have a non-flat, 10Hz jacked up response possibly now reaching human hearing threshold with a reference level reproduction playback level, so through their "cheating" system they'll say "10Hz and lower reproduction makes a difference I can detect, even if I limit myself to reference reproduction level playback, and I appreciate it".