The sone is a unit of perceived loudness after a proposal of S.S.Stevens in 1936. In acoustics, loudness is a subjective measure of the sound pressure. One sone is equivalent to 40 phons, which is defined as the loudness of a 1 kHz tone at 40 dBSPL. The number of sones to a phon was chosen so that a doubling of the number of sones sounds to the human ear like a doubling of the loudness, which also corresponds to increasing the sound pressure level by 10 dB, or increasing the sound pressure by a factor 3.16 (= root of 10). At frequencies other than 1 kHz, the measurement in sones must be calibrated according to the frequency response of human hearing, which is of course a subjective process. The study of apparent loudness is included in the topic of psychoacoustics.
To be fully precise, a measurement in sones must be qualified by the optional suffix G, which means that the loudness value is calculated from frequency groups, and by one of the two suffixes F (for free field) or D (for diffuse field).
Here's a copy of an email I sent them.
Read from bottom up...
I understand that it is in realtime. Someone needs to put the correct information in though.
I know how to use the site, and the search function. I am computer, and inet literate.
I'm not wondering if the product is in stock. I'm telling you that the info for that product is not
right if it is the same drive. According to the reviews it is the same drive, and It is ncq.
It needs to reflect that.
I'm not asking you to change the inventory. Just make sure that the info is correct.
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From: Scott Cato
Sent: Saturday, April 23, 2005 8:03 AM
Subject: Seagate 160 NCQ drive
I've had this link since before the new site was put up.
I noticed that there are 2 drives the same.
This one should be an NCQ type drive, but it doesn't
say anything about it, and the mfg link sends you to a page
for the regular drive, not the NCQ one.