On Sun, 27 Feb 2000, nick wrote:
Hi!
> 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.
No...
> 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?
That's it. Human ear frequency response (20-20000 Hz typically, at
least for "normal" human beings :P ) isn't flat, until I guess near
89dB/92dB or so if I remember correctly...
> 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?
The function of an adequately implemented loudness feature is to
compensate the variable frequency response curve of human hearing, by
variably rising low/high frequencies depending on sound levels, and
turning basicly flat at 89/92dB or so.
It isn't a matter of amp/speakers capability, which is usually compensated
for an specific room by analyzing its acoustic response with pink noise
and a spectrum analizer, and flattening the freq. response at the "flat"
level (those dB mentioned earlier) using an equalizer.
greets,
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Francisco J. Montilla System & Network administrator
[EMAIL PROTECTED] irc: pukka Seville Spain
INSFLUG (LiNUX) Coordinator: www.insflug.org - ftp.insflug.org
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