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Know your AV


  • Written by Denom
  • Category: Know your AV
  • Hits: 1050


An amplifier, electronic amplifier or (informally) amp is an electronic device that increases the power of a signal.

It does this by taking energy from a power supply and controlling the output to match the input signal shape but with a larger amplitude. In this sense, an amplifier modulates the output of the power supply to make the output signal stronger than the input signal. An amplifier is effectively the opposite of an attenuator: while an amplifier provides gain, an attenuator provides loss.

The four basic types of electronic amplifiers are voltage amplifiers, current amplifiers, transconductance amplifiers, and transresistance amplifiers. A further distinction is whether the output is a linear or nonlinear representation of the input. Amplifiers can also be categorized by their physical placement in the signalchain.

Type of amplifiers
AV receiver (AVR)
2 Channel Solid State Amplifier
Pre Amplifier
Power Amplifier
Monoblock Amplifier
Wiki Link - https://en.wikipedia.org/wiki/Amplifier

2 channel amplifier without Tone Controls - NaimNait XS-2

2 channel amplifier with Tone Controls Yamaha A-S500


Tube Amplifier Jadis DA50S /RC


AV receiver (AVR)

An audio/video receiver (AVR) is a consumer electronics unit used in a home theater. Its primary purpose is to receive audio and video signals from a number of sourcesand process them to drive loudspeakers and a display. Possible displays include, television, monitor, or video projector while the inputs may come from, television, satellite receiver, radio, DVD players, Blu-ray Disc players, VCRs, and video game consoles. The AVR source signal and other settings, including volume, are normallyset by a remote controller.

The term receiver basically refers to an amplifier that has a built-in radio tuner. With A/V receivers the basic functionality is to receive an audio signal, amplifythe audio signal, and allow pass-through of the corresponding video signal to a display device such as a projector or a television.

As home entertainment options expanded, so did the role of the receiver. The ability to handle a variety of digital audio signals was added. More amplifiers were added for surround-sound playback. Video switching was added to simplify changing from one device to another. Within the last few years, video processing has been added to many receivers.

The term audio/video receiver (AVR) or Home Theater Receiver is used to distinguish the multi-channel audio/video receiver (home theater receiver) from the simpler stereo receiver, though the primary function of both is amplification.

AV receivers may also be known as digital audio-video receivers or digital media renderers.[1]

The AV receiver is classified as an audio frequency electronic amplifier. But with the rapid addition of several features, AV receivers now generally have significant additional functionality.

Wiki Link - https://en.wikipedia.org/wiki/AV_receiver

Shown Here is Yamaha RX-V677



A preamplifier (preamp) is an electronic amplifier that prepares a small electrical signal for further amplification or processing. A preamplifier is often placed close to the sensor to reduce the effects of noise and interference. It is used to boost the signal strength to drive the cable to the main instrument withoutsignificantly degrading the signal-to-noise ratio (SNR). The noise performance of a preamplifier is critical. According to Friis's formula, when the gain of the preamplifier is high, the SNR of the final signal is determined by the SNR of the input signal and the noise figure of the preamplifier.

In a home audio system, the term 'preamplifier' may sometimes be used to describe equipment which merely switches between different line level sources and applies a volume control, so that no actual amplification may be involved. In an audio system, the second amplifier is typically a power amplifier (power amp). The preamplifierprovides voltage gain (e.g., from 10 mV to 1 V) but no significant current gain. The power amplifier provides the higher current necessary to drive loudspeakers.


McIntosh C50 Pre Amplifier


Power Amplifier

An audio power amplifier is an electronic amplifier that amplifies low-power audio signals (signals composed primarily of frequencies between 20 - 20 000 Hz, the human range of hearing) to a level suitable for driving loudspeakers. It is the final electronic stage in a typical audio playback chain.

The preceding stages in such a chain are low power audio amplifiers which perform tasks like pre-amplification (this is particularly associated with record turntable signals), equalization, tone controls, mixing/effects, or audio sources like record players, CD players, and cassette players. Most audio power amplifiers requirethese low-level inputs to adhere to line levels.

While the input signal to an audio power amplifier may measure only a few hundred microwatts, its output may be tens or hundreds of watts for a home stereo system or thousands or tens of thousands of watts for a concert sound reinforcement system.


McIntosh MC450 Pre Amplifier


Monoblock Amplifier

Monoblocks are two separate amplifiers, one for the left channel, and one for the right. Two monoblocks are needed for a stereo set, and home theater applications can use three or more. You definately get reduced crosstalk, because each channel uses its own separate power supply. You can also place your amps closer to your speakers,reducing the length of speaker cables needed. But you will probably need two sets of power cords(if you are into that thing), and perhaps longer interconnects, depending on where you locate your amps. If you do not know what monoblocks are, or are new to the hobby, perhaps a single stereo amp is best. But if you have the cash and room, or are into serious home theater, its an excellent way to go!

McIntosh Mc2KW Moniblock power Amplifier


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