Please 'Boom' Responsibly As most of you have noticed, the noise ordinances have become much tougher lately. Most of this is due to idiots, yes IDIOTS, who drive through residential areas with their windows down while their system is playing at full power. To make things worse, the music they listen to has all sorts of foul language that's not suitable for small children, (who may be playing outside). There are even a few people, who are even beyond idiot status, that play their systems at full power through residential areas after 10:00 PM (when many people go to bed). I don't believe that this type of behavior is good for the industry. If the fines get too stiff, people will stop buying large systems. If this happens, more people will get out of car audio (who wants a mediocre system). People get interested in things because they're exciting. A deck and four 6.5" speakers are not going to interest many of the younger car audio enthusiasts. If car audio enthusiasts keep annoying more and more people, the fines will keep getting tougher. All of this will only reduce interest in the equipment that fuels the industry. If you want to listen to your system at full volume, get out on the highway where there's little chance of bothering anyone. When you get to a red light, turn it down. If the only thing attractive about you is your 'system', you have some work to do. Bottom line... Think about what you're doing. Think about other people. It's not the end of the world if you have to turn the volume down for a little while.

Inductor:
An inductor is an electronic device which consists of a coil of wire which may have a metallic or ferrite core. If it appears to have no core, it is considered to have an air core. The core material will greatly affect the value of the inductor. The unit of measure is the 'henry', but since that is such a large value of inductance, the value is usually stated in millihenries. One henry is equal to one thousand millihenries.
If everything else stays constant, increasing the number of turns of wire around the core, will increase the value of the inductor.

This is the schematic symbol for an inductor.

Inductor schematic symbol

This one example of what an inductor might look like.

Inductor core types used for audio
 
Iron Core:
Laminated iron cores are generally used in low cost, low power inductors. Iron core inductors are good for low power crossovers. If they are used in high power systems (generally over 100 watts), the core may saturate.

Iron Core

Ferrite Core:
Ferrite core inductors are used in moderately high power systems. They can generally be used up to 250 watts (depending on the electrical properties of the ferrite material). A larger gauge wire must be used (compared to the iron core) to keep the DCR at acceptable levels.

Ferite Bobbin Core

Air Core:
Air core inductors are the high power champs. They will not saturate with high power. The wire must be even larger than the ferrite core because much more wire must be used in the coil to reach a given value.

Air Core

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