In article , housetrained
wrote:


The use of a pair of objects that help to define the quality of the
equipment before purchase. EARS.

They are vital. The snag is that knowing how to use them is also vital if
any conclusions you draw are to have value, and for results to mean
what you assume in a given case.

For example, you would need to know that a small movement of the head may
alter the sounds reaching your ears. And that your hearing physiology
changes with time, and with factors like having just listened to something.
Hence what you hear may change for reasons that have nothing to do with any
items/changes you are trying to compare by listening.

Slainte,

Jim

--
Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Audio Misc http://www.st-and.demon.co.uk/AudioMisc/index.html
Armstrong Audio http://www.st-and.demon.co.uk/Audio/armstrong.html
Barbirolli Soc. http://www.st-and.demon.co.uk/JBSoc/JBSoc.html