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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:

High Gain Amplifiers for Commercial and Military Radar Released by Pasternack - PR Newswire (press release)

Semiconductor Today

High Gain Amplifiers for Commercial and Military Radar Released by Pasternack
PR Newswire (press release)
Pasternack's new high gain amplifier modules are optimized for 1.2 – 1.4 GHz and 3.1 – 3.5 GHz radar applications, packaged in hermetically-sealed metal enclosures and exhibit outstanding performance in high gain, gain flatness, high output power and ...
Pasternack launches L- and S-band high-gain amplifiers for 1.2-1.4GHz and 3.1 ...Semiconductor Today
Pasternack intros high gain amplifiers for commercial and military radarCIOL

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Comtech Telecommunications Corp. Receives $3.6 Million Contract Award for ... - MarketWatch

Comtech Telecommunications Corp. Receives $3.6 Million Contract Award for ...
MarketWatch
These amplifiers are used by the world's largest supplier of image-guided radiotherapy (IGRT) and image-guided intensity modulated radiation therapy (IMRT) medical equipment providing state-of-the-art solutions for the treatment of cancer. These ...

High Gain Amplifiers suit commercial/military radar applications. - ThomasNet News (press release)

ThomasNet News (press release)

High Gain Amplifiers suit commercial/military radar applications.
ThomasNet News (press release)
Irvine, CA — Pasternack Enterprises, Inc., an industry leading manufacturer and supplier of RF, microwave and millimeter wave products, releases a new portfolio of L and S band high gain amplifiers covering 1.2 - 1.4 GHz and 3.1 – 3.5 GHz specifically ...

IFL and Amplifier Design Considerations - Satellite Today

Satellite Today

IFL and Amplifier Design Considerations
Satellite Today
Ongoing development of smaller and more powerful uplink satcom amplifiers, plus more powerful satellite transponders, have created the option of using less powerful outdoor equipment located directly at the antenna for many operators. Trade-offs based ...

Personal sound amplifiers are inexpensive way to hear better - Press of Atlantic City

Personal sound amplifiers are inexpensive way to hear better
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TV and Telephone Amplifiers: To hear the television better, there are a number of TV listening devices on the market that will let your husband increase the volume and adjust the tone to meet his needs, without blasting out you or the rest of the ...

Tube amplifiers aren't just for audiophiles - CNET

Tube amplifiers aren't just for audiophiles
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When I spoke with my friend Blackie Pagano about why tube guitar amps are enjoying continuing popularity he said, "Rock music was invented with tube amplifiers, the amplifiers are musical instruments, and their distortion became in integral part of the ...

Silvertone : 1484 Twin Twelve - Ultimate-Guitar.Com

Silvertone : 1484 Twin Twelve
Ultimate-Guitar.Com
6. Overall Impression: This amplifier is absolutely perfect for me. The warm, slightly crunchy natural tone of the amplifier cleans up perfectly when you roll off the volume on your guitar, and when pushed with distortion and overdrive the amp ...

Sony - 3 new models of AV amplifiers - AkihabaraNews

AkihabaraNews

Sony - 3 new models of AV amplifiers
AkihabaraNews
The high-end model "STR-DN1050" (¥62,000) among these 3 new models supports high-resolution audio playback including DSD/Direct Stream Digital audio data (2.8MHz). The standard model "STR-DN850" (¥52,000) also supports high-resolution audio, ...

Musical Fidelity M1PWR Stereo/Mono Amplifier Review - eCoustics.com

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Class D, or switching, amplifiers have been widely accepted in the professional studio and touring realms. Inherent in a Class D design for amplifiers is higher efficiency (or less heat), as the amplifiers are only “switched on” when there is music ...

Pasternack launches 1W and 2W medium-power broadband amplifiers up to ... - Semiconductor Today

Semiconductor Today

Pasternack launches 1W and 2W medium-power broadband amplifiers up to ...
Semiconductor Today
RF, microwave and millimeter-wave product maker Pasternack Enterprises Inc of Irvine, CA, USA has launched ten new 1 Watt and 2 Watt broadband amplifiers suitable for defense, EW/ECM (electronic warfare/electronic counter-measures), radar, test ...
New Medium Power Broadband Amplifiers Debuted by PasternackPR Web (press release)

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