The nominal impedance of a component or circuit is often assigned one of these standard values, regardless of whether the measured impedance exactly corresponds to it.
22.
Amplifiers can therefore be safely specified to operate into a load that has this " nominal impedance " ( or higher, but not lower ).
23.
So much so that differences in practice between a 16 ohm nominal impedance driver and a 4 ohm nominal impedance driver have not been important enough to adjust for.
24.
So much so that differences in practice between a 16 ohm nominal impedance driver and a 4 ohm nominal impedance driver have not been important enough to adjust for.
25.
It is important that these are connected to a circuit capable of dealing with impedances in the appropriate range and assigning a nominal impedance is a convenient way of quickly determining likely incompatibilities.
26.
Typical nominal impedances for speakers include 4, 6, 8 and 16? ( ohms ), with 4? being most common in in-car loudspeakers, and 8? being most common elsewhere.
27.
The nominal impedance quoted for this type of cable is, in this case, very nominal, being valid at only one spot frequency, usually quoted at 800 Hz or 1 kHz.
28.
According to Stephen Lampen of Belden Wire & Cable 75 ? was chosen as the nominal impedance rather than 77 ? because it corresponded to a standard AWG wire size for the inner conductor.
29.
Speakers are usually designed to operate at frequencies above their resonance, and for this reason it is the usual practice to define nominal impedance at this minimum and then round to the nearest standard value.
30.
It is usual practice to speak of nominal impedance as if it were a constant resistance, that is, it is invariant with frequency and has a zero reactive component, despite this often being far from the case.
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