Sound Amplifier Devices
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An amplifier better known as an amp colloquially, increases the power of a signal. The term describes an electronic device that has an input signal in the form of voltage or current. Many types of electronic amplifiers are commonly used in radio and television transmitters. You get receivers for high-fidelity stereos, microcomputers and other electronic digital equipment including musical instruments.
Sound Amplifier Devices Tube Amp:
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The Range of Sound Amplifier Devices
In audio applications they are used for loudspeakers in public address systems to enhance the human voice or to play pre-recorded music. The quality of amplifiers gets characterized by the range of its specifications. The job of this unique equipment remains simply to produce a more powerful version of the audio signal.
Amplifiers are really quite intricate devices. They get classified by the input or source that they are designed to amplify or the device they are intended to drive. The frequency range of the signals such as Audio, IF, RF or VHF types is to invert the signal or the type of device used in the amplification process, be it a valve or tube or even FET.
Sound as we well know is an interesting aspect that moves air particles around it that in turn move other air particles around them to carry the pulse of the vibrations through the air. It's our ears that pick up these fluctuations in air pressure and translate them into electrical signals which the brain processes.
Amplifiers refer to components and equipment for amplifying the spectrum of audio from televisions, computers, portable CD players and other devices that use speakers to produce sound. The measure of how much noise is introduced in the amplification process is the test of an amplifier.
Noise is a detrimental but unavoidable after effect in electronic devices and components. Metrics for noise factor involves a comparison between output signals to noise ratio and the thermal noise of input signals. It is the electrical signals that fluctuate to represent the compressions and rarefactions of the sound wave.
The two important considerations in power amplification are power output and efficiency. In wireless communications and broadcasting transmitters the efficiency usually varies from fifty to seventy percent. In hi-fi audio power amplifiers, distortion thus becomes an important factor. This remains the measure of extent to which output waveform offers faithful replication of input waveform. The lower the distortion the better the fidelity of the output sound.
Power amplifiers are great for wireless transmitters, broadcast transmitters, and hi-fi audio equipment. The most frequently-used device is of course the bipolar transistor. However, vacuum tubes that had become archaic are now popular once again especially with musicians. Professionals believe that vacuum tubes or valves as they are also known provide superior fidelity.
Actually all the major components in amplifying systems are essentially translators. They receive signals in one form and put it out in another. Eventually the sound signal is translated back into its original form like a physical sound wave. Electronic sound equipment works much the same basic way to represent sound as a varying electric current.
Related: Variable-frequency Drive
Sound Amplifier Devices For Sale
Amplifier For Sale
If you have spent a good deal of money on a pair of good-quality speakers, you want to be certain that you get an audio amplifier that will deliver excellent audio quality while meeting your budget. I will give some pointers about audio amplifier technologies to help you make the right buying decision.
Audio amplifiers come in all different shapes and sizes. They use different technologies and have many technical specs. This makes it difficult to decide which model to pick. You don't have to be an expert. Just follow some simple guidelines and you should be satisfied with your amp.
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Tips For Finding the Perfect Audio Amplifier
One important criterion is the size of the amplifier. You can buy models which can fill half a room. In contrast, some of the latest miniature amplifier models are no larger than a deck of cards. Many units will be the size of a standard audio rack so that you can easily stack it on top of your audio equipment.
The vast majority of today's audio amplifiers are solid state amplifiers as opposed to more traditional tube amplifiers. Tube amplifiers have been dominant a decade or so ago. However, tube amplifiers have fairly high audio distortion. Audio distortion refers to how much the audio signal is being degraded while passing through the amplifier and is given in percent. This value is often used when comparing the audio quality of amplifiers.
Tube amps will have audio distortion of up to 10%. Solid state amplifiers will have lower audio distortion depending on the amplifier technology that is used. The most traditional amps use a "Class-A" and "Class-AB" technology. These amplifiers are also called "analog amplifiers". This technology offers fairly low audio distortion. However, the power efficiency is only 10 to 30%. This means that most of the electrical power supplied to the amplifier is wasted as heat while a small fraction is used to amplify the audio signal.
In contrast, "Class-D" amplifiers which are also called "digital amplifiers" offer a power efficiency of typically 80 to 90%. This allows the amplifier and power supply to be made much smaller than analog amplifiers. The trade off is that digital amplifiers often have higher audio distortion than analog amplifiers. This is mostly a result of the switching distortion of the output power stage. Most recent digital audio amplifiers, however, employ a feedback mechanism and can minimize the audio distortion to below 0.05%.
When selecting an amplifier, ensure that the output power is sufficient to drive your speakers. The required power will be determined by how much power your speakers can handle as well as the size of your room where you will be listening. Speaker power handling capability is given as peak power and average power. The peak power value refers to how much power the speaker can handle for a short period of time while the average power handling value describes how much power you can drive the speaker at continuously without damage.
If your listening environment is fairly small then you may not need to drive your speaker to its rated power handling value. You would probably be good having an amplifier that can deliver 20 to 50 Watts even though your speakers may be able to handle 100 Watts of power. Note though that speakers differ in their sensitivity. Typically a low-impedance speaker will be easier to drive to high volume than a high-impedance speaker. Be sure that your amp can drive your speaker impedance. You can easily find the rated speaker impedance range in your amplifier's user manual.
Lastly, make sure that your amplifier introduces little noise and has a broad enough frequency response. High-quality amplifiers will have a signal-to-noise ratio of at least 100 dB and a frequency response of at least 20 Hz to 20 kHz.
Understanding The Various Types Of Audio Amplifiers
Audio amplifiers play a major role in increasing the quality of sound from your system. As a result of technological advances, the units are of different types with the main types being:
FET
This is a device that makes use of one or more field-effect transistors (FETs). The main advantage with the device is that it has high input impedance and low output impedance. Although, there are many devices under this category, the most famous is the MOSFET (Metal Oxide Semiconductor Field Effect Transistor).
Tube Amps
Tube amplifiers use vacuum tubes to convert the AC signal to DC current. The current obtained is the one that is used in powering the speakers. If you want to increase the strength of the signal, it's recommended that you combine multiple tubes.
The units that fall under this category are classified into two main groups: high and low power units. The high powered tube amps use a pentode circuit design while the lower powered units use a single ended triode (SET) design. The SET units are common with people with high efficiency speakers.
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Class A, Class B and Class AB
The class of the amplifier refers to the circuit design. Amps in class A produce maximum power output regardless of whether the source is playing. The good side with the units in this class is that they have very low distortion levels.
Class B units are characterized by their tendency to idle when there is no current and then turn on when an input source hits them. Although, they are efficient in their working, they tend to have high levels of distortion.
Class AB is a combination of the two amplifiers (class A and B). The signal drives on circuit in class A, and when it turns off, the amp switches to the second circuit.
Stereo, monoblock, and multichannel
Stereo amplifiers usually drive a pair of speakers. Monoblock units on the other hand have high power ratings and drive only one speaker. Multichannel units are used in home theater applications and they are designed to drive five channels; however, there are others that have the ability of driving even seven channels.
Conclusion
These are the various types of audio amplifiers. Before buying the units, you need to ensure that you understand the specifications of each to be certain that you are buying the right unit. To be on the safe side you should always ensure that you buy from a reputable store.
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