G'day

A while back, I read somewhere (on here?) that the loudness feature on 
stereos, in particular car stereos, boosts lower frequencies that the 
speakers won't produce with a low level from the amplifier.

However, the other day, we were taught in high school physics the following:
"At low intensity levels our ears are noticeably less sensitive to low and 
high frequencies. Loudness controls on stereos can compensate for this."
Which is it?

My thoughts are that low levels on a stereo simply put through a low level 
of all frequencies, and the amp - providing it has sufficient headroom - 
will help the speakers produce these frequencies as best they can. The 
softness at certain frequencies would then come in with the inadequacies of 
our ears, which is partially corrected with the "loudness" feature.
Thoughts?

Nick



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