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CAR AMPLIFIERS INFORMATION:

mplifiers take a signal from a source and produce a larger one. This process makes the sound powerful. The main challenge of any amp is to amplify the signal without producing any distortions. Amplifiers must maintain sufficient power and that’s why they have a powerful power supply. Many car owners add amplifiers to maximize their sound performance and quality.

How do car amplifiers work?
A cassette radio or CD player produces a maximum of about nine real watts into four speakers given the power it gets from the car's electrical system. So what if you want more than nine real watts to power each of the speakers? You obviously need an amplifier. Amplifiers give more power allowing you to play your music more loudly. Amplifiers also improve the sound quality of music at all volume levels.

Features of Car Amplifiers:

Are you looking for the right amplifier for your car? There is no doubt that choosing the right amp can be a challenging and complicated. Below are some things you need to look for before you buy any car amplifier.

Bridging (Bridgeable Amplifiers):
To understand amplifier bridging, we need to know what it means. Amplifier bridging is basically using 2 channels of an amp to drive a common load. Bridgeable amps have a huge advantage of being able to use them in different system configurations. 4 channel amplifiers, for example, can be used to power four, three or even one speaker if you decide to change it.
Why do I need to bride an amplifier?
Sometimes you need to bridge your car amplifier to maximize power to your speakers and enhance sound performance.

Speaker-level inputs:
Since most factory stereos don’t have amplifier outputs, then the only way to wire your amp is through your radio’s speaker wires. The main advantage of Speaker-level inputs is being able to hook up an amplifier to your factory stereo system.

Remote bass control:

It’s useful to have a remote bass control because gives you the flexibility to change the output level (power) of the amp from anywhere in the car. The remote bass control knob can be placed anywhere to easily adjust power (or bass) to your subwoofers.

High-pass filter/low-pass filter/crossover:
Filters let you adjust the frequencies you send to the speakers or subs. High-pass filters eliminates can be used to prevent speaker damage caused by low frequencies. The low-pass filters however, eliminate high frequencies the sub can’t handle.

Bass boost:
Bass boost is a circuit in your amplifier that improves the bass even if you don’t have a subwoofer. This can be useful if you need more bass in your system.

Buying the right amplifier is not an easy task due to the technical issues involve. Make sure to understand what you exactly need the amplifier for. This can help you buy the right amp for the budget you can afford.

Amplifiers classes:

Car Amplifiers are clasified by 5 main classes:

Class A Amplifiers:
Although class A amps provide clear sound, they are considered to be inefficient because they get heated very fast. Class A amplifiers also don’t provide enough power for the effort they consume. Class A amplifiers are ideally used for car tweeters.

Class A/B
Unlike class A amps, class A/B amps are considered to be more efficient but produce more distortion. A class A/B car amplifier is formed when a class B style output stage is biased so that around the crossover point both transistors are conducting. This yields more distortion than either a proper class A or class B amplifier, however the bias point is much less critical.

Class B amps consist of two transistors, one for each supply rail. In properly-biased class B, only one conducts at a given time, but there is always one conducting. Much of the bad name class B has is due to amplifiers actually being underbiased into class C where there's a portion of the cycle around the crossover point where neither is conducting.
Furthermore, Class B proper biasing may be made very difficult to achieve due to thermal stability issues (especially proper thermal coupling and tracking between the biasing circuit and the output power devices). Class C amplifiers are useless for audio. They are used in RF applications where the harmonics can be filtered out. Nonetheless, the so called "Class G" is just the plain combining of a normal Class AB car amplifier output stage with a Class C "booster" enabled to operate only if high power peak are required by the load. If properly designed they performances are equivalent to that obtained by normal class AB amplifiers.

Class D amplifiers are a rather new phenomenon in the hifi world. They are extremely efficient (80%) and can give a very good result. They use pulse width modulation to amplify the signal; this lets them use the output transistors in switch mode where they're most efficient and dissipate the least power. Originally only for subwoofers, newer designs have since surfaced making this technology capable of sounding very good as a full-range amplifier.

A class D amplifier is one in which the output transistors are operated as switches. When a transistor is off, the current through it is zero. When it is on, the voltage across it is small, ideally zero. In each case, the power dissipation is very low. This increases the efficiency, thus requiring less power from the power supply and smaller heat sinks for the amplifier. These are important advantages in portable battery-powered equipment. The “D” in class-D is sometimes said to stand for “digital.” This is not correct because the operation of the class-D amplifier is based on analog principles. There is no digital coding of the signal. Before the advent of the class-D amplifier, the standard classes were class-A, class-AB, class-B, and class-C. The “D” is simply the next letter in the alphabet after “C.” Indeed, the earliest work on class-D amplifiers involved vacuum tubes and can be traced to the early 1950s.

The high switching frequency used in class-D amplifiers is a potential source of rf interference with other electronic equipment. The amplifiers must be properly shielded and grounded to prevent radiation of the switching harmonics. In addition, low-pass filters must be used on all input and output leads, including the power supply leads.

Amplifier Classes Comparison:

Amplifier Class

Advantages

Disadvantages

Class A Amplifiers

  1. Low Distortion due to low frequency compensation.
  2. Circuit simplicity compared to other amp classes.
  1. Generate lots of heat.
  2. Don’t provide enough power for the effort they consume.

Class A/B Amplifiers

  1. More efficient than class A amps.
  1. High distortion.

Class B Amplifiers

 

  1. High crossover distortion.

 

Class D Amplifiers

  1. Very efficient due to low power indulgence.
  2. Low power consumption.
  1. RF interference with other components.
  2. Must be properly shielded and grounded to avoid radiation.


See also: Cheap Car Amplifiers - JVC Arsenal Amplifiers


CAR AMPLIFIERS NEWS:

Doherty Amplifiers Push Efficiency - TV Technology

TV Technology

Doherty Amplifiers Push Efficiency
TV Technology
ALEXANDRIA, Va.—William H. Doherty was an engineer with Bell Telephone Laboratories in 1936 when he invented a circuit that used two tubes running in Class B configuration to act as a linear amplifier for radio transmitters. An earlier design that ...

Anadigics' New Line Amplifiers Deliver Highest RF Power - Analyst Blog - Nasdaq

Anadigics' New Line Amplifiers Deliver Highest RF Power - Analyst Blog
Nasdaq
The new ACA2455 and ACA4733 high-power line amplifiers deliver world-class output power, linearity and efficiency. They are optimized for fiber deep, Node+0 networks, and node segmentation/split upgrades. Their power consumption is minimal at only ...

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Hearing Amplifiers Market Will Be Reaching $78.2 Million By 2022: New Report ... - GlobeNewswire (press release)

Hearing Amplifiers Market Will Be Reaching $78.2 Million By 2022: New Report ...
GlobeNewswire (press release)
San Francisco, California, June 16, 2015 (GLOBE NEWSWIRE) -- Global hearing amplifiers market is expected to reach USD 78.2 million by 2022, according to a new study by Grand View Research Inc. Growing prevalence of deafness and hearing disorders ...

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Coherent Q-Switched, Green Lasers for Pumping Amplifiers and Commercial ... - Novus Light Technologies Today

Coherent Q-Switched, Green Lasers for Pumping Amplifiers and Commercial ...
Novus Light Technologies Today
Revolution lasers are designed for pumping ultrafast amplifiers, both multipass and regenerative, based on Titanium:sapphire, and are already integrated as a standard system component within Coherent's latest one-box amplifiers, the Astrella family.

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Danley Introduces DNA Series of Networkable Amplifiers - Audio Visual News Network

Audio Visual News Network

Danley Introduces DNA Series of Networkable Amplifiers
Audio Visual News Network
Danley Sound Labs, maker of loudspeakers and subwoofers for professional sound reinforcement applications, announces a new series of British-made amplifiers and processors. Named the Danley DNA (Danley Networkable Amplifier) Series, the ...

Q-Switched, Green Lasers deliver industrial-grade reliability. - ThomasNet News (press release) (blog)

ThomasNet News (press release) (blog)

Q-Switched, Green Lasers deliver industrial-grade reliability.
ThomasNet News (press release) (blog)
July 1, 2015 - Providing average power up to 80 W at 527 nm with beam profile featuring smooth energy distribution, Revolution series suits pumping amplifiers and commercial applications. Pulse rate flexibility allows smooth adjustment of repetition ...

Beale Street Audio Launches Four Amplifiers and a Calibration App - Home Theater Review

Beale Street Audio Launches Four Amplifiers and a Calibration App
Home Theater Review
Beale-D2.jpg Beale Street Audio has launched four new amplifiers designed for both commercial and residential applications--including the two-channel Model D2.1 (shown here), the four-channel Model A4X40, the 12-channel Model IA1250, and the Model ...

ANADIGICS Launches CATV Infrastructure Line Amplifiers With Industry's ... - GlobeNewswire (press release)

ANADIGICS Launches CATV Infrastructure Line Amplifiers With Industry's ...
GlobeNewswire (press release)
COLOGNE, Germany, June 11, 2015 (GLOBE NEWSWIRE) -- ANADIGICS, Inc. (Nasdaq:ANAD) ("ANADIGICS" or the "Company"), a world leader in radio frequency (RF) solutions, today introduced two new high-power GaN infrastructure line amplifiers for ...
Anadigics launches GaN-based DOCSIS 3.1 CATV infrastructure line amplifiers ...Semiconductor Today
Anadigics launches Highest RF Power/Watt CATV AmpsCompound Semiconductor

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Extron launches new compact amplifiers with Dante - DigitalProductionME.com

Extron launches new compact amplifiers with Dante
DigitalProductionME.com
Extron Electronics has announced the availability of the NetPA 502 AT and NetPA 1001 70V AT - Extron's half rack 1U, convection-cooled power amplifiers, equipped with Dante digital audio networking. The NetPA 502 AT delivers two channels of 50 watts ...

Pasternack Releases New Solid State, High Power Amplifiers - TV Technology

TV Technology

Pasternack Releases New Solid State, High Power Amplifiers
TV Technology
These RF amplifiers have output power levels greater than 10 watts that cover broadband frequencies from 150 kHz to 7500 MHz. Solid state 50 ohm hybrid MIC designs use GaN, GaAs or LDMOS transistor technology that offers high dynamic range and ...

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