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Изменения к шагу №8

Отредактированно Andrew Optimus Goldheart -

Правка одобрена автор Andrew Optimus Goldheart

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[* black] The mid-range drivers have pretty impressive permanent magnets, accounting for 37% of the device's total 5.7 lbs.
[* black] Want more specs on the speakers? So did we. Since Sonos is hush-hush about them, we decided to do some poking and prodding of our own. Here's what we came up with:
[* red] 2 ¾" mid-range drivers (2" [http://makeprojects.com/Project/Styrofoam+Plate+Speaker/37/1#.UQA1NaGltOR|composite speaker cones])
[* orange] 4.8 Ω ''measured'' impedancemeasured ''resistance''
[* orange] 4.8 Ω ''measured'' impedancemeasured ''resistance''
[* yellow] 1" silk dome tweeter
[* green] 3.7 Ω ''measured'' impedancemeasured ''resistance'' (tweeter)
[* black] Why do we stress that those impedancesthese are measured?measured ''resistances''? While speaker ratings are given in ohms, the unit of resistance, they're actually values of impedance, which is dependent on the specific frequency being played. Home stereo speaker impedances are usually 8 Ω, but will read lower than that onbecause a [product|IF145-035|multimeter]product|IF145-035|multimeter] can only read resistance, our measurement will be lower.
[* green] 3.7 Ω ''measured'' impedancemeasured ''resistance'' (tweeter)
[* black] Why do we stress that those impedancesthese are measured?measured ''resistances''? While speaker ratings are given in ohms, the unit of resistance, they're actually values of impedance, which is dependent on the specific frequency being played. Home stereo speaker impedances are usually 8 Ω, but will read lower than that onbecause a [product|IF145-035|multimeter]product|IF145-035|multimeter] can only read resistance, our measurement will be lower.