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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 thats 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 dont have amplifier outputs, then the only way to wire your amp is through your radios 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:

Its 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 cant handle.

Bass boost:
Bass boost is a circuit in your amplifier that improves the bass even if you dont 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 dont 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:

Photo Release -- ANADIGICS Small-Cell Power Amplifiers Selected by Nextivity - MarketWatch

Photo Release -- ANADIGICS Small-Cell Power Amplifiers Selected by Nextivity
MarketWatch
ANADIGICS, Inc. ANAD, -6.26% a world leader in radio frequency (RF) solutions, today announced that it is shipping production volumes of its AWB7122 and AWB7222 small-cell power amplifiers to Nextivity. A global provider of indoor coverage technology, ...

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Sound Advice: Amplifiers are as unique as speakers - Pittsburgh Post Gazette

Sound Advice: Amplifiers are as unique as speakers
Pittsburgh Post Gazette
Answer: I don't think all amplifiers sound the same, but nor do I believe the differences are as immense as some audio publications would lead one to believe. The key is matching an amplifier to the speakers. Different makes and models of speakers work ...

Stereo amplifiers do differ —but not as much as some think - Minneapolis Star Tribune

Stereo amplifiers do differ —but not as much as some think
Minneapolis Star Tribune
Q: You wrote in a previous column that you do not think all amplifiers sound the same. Do you think there are extremely large differences in amplifier sound? I have read both sides of the argument, that there are no differences or there are very large ...

McIntosh MHA100: The Cadillac of headphone amplifiers - CNET

McIntosh MHA100: The Cadillac of headphone amplifiers
CNET
I've pestered McIntosh engineers for years about building headphone amplifiers, and all they would ever say was, "We're working on it." I was starting to wonder if it would ever happen, and now they've done it and the result is called the MHA100. No ...

Anadigics Ships Power Amplifiers for WiFi Infrastructure - Zacks.com

Semiconductor Today

Anadigics Ships Power Amplifiers for WiFi Infrastructure
Zacks.com
Leading radio frequency solutions developer Anadigics, Inc. (ANAD - Analyst Report) recently announced that it is supplying AWL5905 and AWL5910 power amplifiers to a next-generation undisclosed communications technology company in North America.
Anadigics Ships Power Amplifiers for WiFi Infrastructure - Analyst BlogNASDAQ
Anadigics' power amplifiers enabling 802.11n and 802.11ac WiFi connectivity ...Semiconductor Today
US Infrastructure Manufacturer Selects Anadigics PAsCompound Semiconductor
RF Globalnet (press release)
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McIntosh shows two new power amplifiers at CEDIA Expo 2014 - What Hi-Fi?

What Hi-Fi?

McIntosh shows two new power amplifiers at CEDIA Expo 2014
What Hi-Fi?
McIntosh has shown two new transistor-based power amplifiers at CEDIA Expo 2014. By the company's standards these are entry-level units with the MC152 stereo amp weighing in at $4500 and the monobloc MC301 costing $5000. The MC152 is the ...

Exar Introduces Industry Leading Low Power Rail-to-Rail Amplifiers - CNNMoney

Exar Introduces Industry Leading Low Power Rail-to-Rail Amplifiers
CNNMoney
FREMONT, Calif., Sept. 4, 2014 /PRNewswire/ -- Exar Corporation (NYSE: EXAR), a leading supplier of high-performance integrated circuits and system solutions, today announced two industry-leading operational amplifier families, the XR1008/XR2008 and ...

and more »

II-VI Inc showcasing new compact optical amplifier array product platform at ECOC - Semiconductor Today

II-VI Inc showcasing new compact optical amplifier array product platform at ECOC
Semiconductor Today
Arrayed amplifiers are critical to emerging optical network architectures including colorless, directionless and contentionless (CDC) networks, says the firm, as they overcome signal losses in the optical switching equipment. Accordingly, compact, high ...

Operational Amplifiers provide rail-to-rail outputs. - ThomasNet News (press release) (blog)

ThomasNet News (press release) (blog)

Operational Amplifiers provide rail-to-rail outputs.
ThomasNet News (press release) (blog)
September 10, 2014 - Minimizing power dissipation in high channel count applications, XR1008/XR2008 single/dual amplifiers offer 75 MHz bandwidth while consuming 505 µA supply current, while XR1009/XR2009 provide 35 MHz at 208 µA. All 4 devices ...

RFMD expands GaN portfolio to support DOCSIS 3.1 cable networking - Semiconductor Today

RFMD expands GaN portfolio to support DOCSIS 3.1 cable networking
Semiconductor Today
RF Micro Devices Inc of Greensboro, NC, USA has unveiled 11 new amplifiers, of which six are gallium nitride (GaN)-based products to support the requirements of the new data over cable service interface specification (DOCSIS) 3.1. RFMD is showcasing ...
RFMD Expands Industry-Leading GaN Product Portfolio to Support DOCSIS 3.1 ...NASDAQ

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