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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:

Comtech Telecommunications Corp. Receives $1.5 Million High-Power ... - MarketWatch

Comtech Telecommunications Corp. Receives $1.5 Million High-Power ...
MarketWatch
CMTL, +0.17% announced today that its Santa Clara, California-based subsidiary, Comtech Xicom Technology Inc., has received an award for $1.5 million to supply high-power millimeter-wave traveling wave tube amplifiers (TWTAs) from a U.S. government ...

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New amplifier design could improve quantum circuits - physicsworld.com

New amplifier design could improve quantum circuits
physicsworld.com
The "Josephson travelling-wave parametric amplifier" uses a technique called "resonant phase matching", which is expected to boost the gain in the amplifier by more than 10 dB compared with existing Josephson parametric amplifiers (JPAs). The new ...

JBL Synthesis Introduces SDA-8300 and SDA-4600 Network Amplifiers - Home Theater Review

JBL Synthesis Introduces SDA-8300 and SDA-4600 Network Amplifiers
Home Theater Review
JBLSynthesis-SDA-8300.jpg JBL Synthesis has added two multichannel network amplifiers to its lineup: the eight-channel SDA-8300 (shown here) and the four-channel SDA-4600. Both models offer networked digital audio and control connectivity to JBL ...

RF amplifiers - Plant Engineering

RF amplifiers
Plant Engineering
These new RF amplifiers provide operation up to 26.5 GHz depending on the model, gain levels ranging from 15 dB to 50 dB, power output ratings (P1dB) from 10 mW to 20 Watts, noise figures ranging from 0.8 dB to 2 dB and gain flatness down to ±0.5 dB.
Comprehensive Portfolio of RF Amplifiers Now Available from Fairview MicrowaveWebWire (press release)

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Anadigics Ships Patented InGaP-Plus Driven Power Amplifiers - Zacks.com

Anadigics Ships Patented InGaP-Plus Driven Power Amplifiers
Zacks.com
Leading radio frequency solutions supplier Anadigics, Inc. (ANAD - Analyst Report) has recently been shipping loads of production volume of various power amplifiers, developed under its patented InGaP-Plus technology, to several leading manufacturers ...

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Advantech Wireless Increases Production Capacity Of GaN Based Solid State ... - RF Globalnet (press release)

Compound Semiconductor

Advantech Wireless Increases Production Capacity Of GaN Based Solid State ...
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Due to the success of Advantech Wireless GaN based Solid State Power Amplifiers & BUCs and the great response from the market, the company has today its most popular list of GaN based products available to be supplied with short delivery time.
Advantech Wireless Pumps Up Capacity to Meet Demands of GaN Amps and ...SatNews Publishers
Advantech Wireless increases production capacity of GaN-based SSPAs and ...Semiconductor Today

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SA75 switching amplifiers are suitable for applications in energy, aeronautics ... - The Engineer

SA75 switching amplifiers are suitable for applications in energy, aeronautics ...
The Engineer
CEDRAT TECHNOLOGIES has developed the SA75 switching amplifier range in partnership with G2ELab. The SA75D model is described as the most powerful amplifier on the market for piezo actuators and is designed for applications that demand reactive ...

Salem council acts to cut Halloween noise complaints Partial ban on amplifiers ... - The Salem News

Salem council acts to cut Halloween noise complaints Partial ban on amplifiers ...
The Salem News
SALEM — A controversy over street preachers and noise disturbances in this city's downtown that gained steam after a recent confrontation dubbed “Nosferatu vs. the Street Preacher” has led to a ban on use of bullhorns and other amplification equipment ...

Research and Markets: European Amplifiers Market Report Analysis and ... - Business Wire (press release)

Research and Markets: European Amplifiers Market Report Analysis and ...
Business Wire (press release)
The report provides an in-depth analysis of the EU Market of Amplifiers. It presents the latest data of the market size and volume, domestic production, exports and imports, price dynamics and turnover in the industry. The report shows the sales data ...

Anadigics Launches two GaN Line Amplifiers for CATV - Compound Semiconductor

The Korea Bizwire

Anadigics Launches two GaN Line Amplifiers for CATV
Compound Semiconductor
Anadigics has today introduced two new high-power GaN line amplifiers for CATV systems. The ACA2455 and ACA2456 line amplifiers support full DOCSIS 3.1 bandwidth, operating up to 1.2GHz, while supporting legacy bands down to 50MHz.
ANADIGICS Launches New GaN Line Amplifiers With Industry's Highest Output ...Stockhouse
ANADIGICS Expands DOCSIS 3.1 CATV Infrastructure PortfolioGlobeNewswire (press release)

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