Basic Technical Sound Guide

SOUND
What is the Sound
The humanly audible sound consists of sound waves and acoustic waves that occur when the oscillations of air pressure are converted into mechanical waves in the human ear and perceived by the brain. The propagation of sound is similar in fluids, where the sound takes the form of pressure fluctuations.

ACOUSTICS
What is a wave?
It is the movement of propagation from one point to another point.

What is the frequency?
It is the number of times that a vibration is repeated per unit of time. In the international system, it is measured in HZ.

What is the Amplitude?
Vertical distance between a crest or stop and a midpoint of the wave. In the international system, it is measured in units of distance in feet, meters, etc.

Characteristic of a speaker
The system is constituted by the magnet and the voice coil. The magnet assembly consists of polar pieces, polar plate, back plate and pole. The function of the polar pieces is to conduct the magnetic magnet generated by the magnet, concentration of the same in a circular groove called air space where the coil will work. Generally, a strontium or barium ferrite ceramic magnet in the form of a ring is used. The polar pieces made of sweet iron and the magnet should be superimposed.

OHM'S LAW
History
Georg Simon Ohm (Erlangen: March 16, 1789 - Munich: July 6, 1854) was German physicist and mathematician who contributed to the theory of electricity the Law of Ohm, known mainly for his research on electric currents.
I study the relationship that exists between the intensity of an electric current, its electromotive force and resistance, formulating in 1827 the law that bears its name that states that I = V / R

Definition
The intensity that circulates through a closed electrical circuit is directly proportional to the voltage applied to it, and inversely proportional to the resistance offered by the load connected to it.

That expressed in the form of equation:

It is evident that having two of the three magnitudes we can find out the third with ease. In honor of the physical, the unit of resistance is the ohm.

For those less related to the clearing of mathematical formulas you can also perform the calculations of tension, current and resistance corresponding to Ohm's law, in an easier way using the practical resource:

CURRENT
DC Direct Current
The direct current is that which does not vary with respect to time.
The current that is in the car is direct. The positive pole of the battery will always be positive and will maintain its voltage of 12 volts with respect to the earth, all the time.
The current or voltage that is produced from batteries and batteries, that is to say from chemical reactions is direct.

Alternating Current AC
It is one that varies with respect to time.
The voltage we have in the home form is an alternating voltage, with a value rms 120 volts and a frequency 60 cycles seconds or in Hertz.

Tester and its function

RELAY
A relay is basically a switch, controlled by a second circuit. The 5-leg car is used in the car audio, here is an example of how it works.

REPRODUCTIVE RADIO

How to install a main unit:

INSTALLATION OF COMPLETE BASIC SYSTEM IN A VEHICLE

PARLIANT COMBINATIONS FORMULAS

Serially:

In parallel:

Series - Parallel:

I hope you like this basic guide. Any questions leave me your comments.

Now some pictures of Car audio in Venezuela.