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[Ivan Beaver]

Perhaps why speaker impedances are often quoted as nominal impedances?  Perhaps that is the technically correct term?

Generally a speakers "nomimal" impedance will be around the lowest impedance it presents, so that is a good starting point for loading on an amp.

But since impedance is a complex load, that has reactance (inductive and capacitive), there is also the PHASE of the impedance that should be considered when looking at the actual load/strain that is put on an amp.

If the load is to capacitive or inductive, that can cause excessive heating of the amplifier-even though the simple voltage-resistance load would not indicate such.

[Steve M Smith]

Knowing what happens with speaker impedances when paralleled is probably enough.  It is covered by ohm's law, but you don't need a full understanding of how it applies to current and voltage.


Steve.

[Frank Koenig]

they used to teach the ME's electrical circuits by replacing the electrical parts with mechanical parts.

And us electrical guys convert mechanical, acoustic, and thermal systems into electrical equivalent circuits to grok them. When the only tool you have is a hammer...

As for circuit (linear system) analysis, I'd throw in the superposition principle and Thevenin and Norton equivalent circuits as well. Equipped with these we can do a lot, even if just for DC or DC-equivalent circuits.

Also very useful is remembering to exploit symmetry to simplify and understand circuits. This, for example, allows us to conclude that when two (identical) speakers are wired in series and fed from a voltage source, each speaker behaves as if it were fed from a voltage source. (For the thought experiment, drive each speaker from one half of a center-tapped (ideal) transformer, and then observe that, due to symmetry, the current in center tap is always zero.)

--Frank

[lindsay Dean]

my head hurts

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