Amplifiers. An amplifier is an essential part of any audio set up. Amplifiers are used to power the components and send electronic audio signals to them which the components can convert into sound output.

Most of the components involved in sound recording and reproduction require only small amounts of current to function, as there is no physical 'work' to be done by a microphone or a tape deck. In fact, in order to be sensitive enough to record good sound, microphones have to be very delicate and produce only tiny signals. The final step in the process of sound reproduction, pushing the speaker cone back and forth, requires more power. To do this, you need to boost the audio signal so it has a larger current while preserving the same pattern of charge fluctuation. This is the job of the Amplifiers. It simply produces a more powerful version of the original audio signal.

In actuality, the amplifier generates a completely new output signal based on the input signal. The output is generated by the amplifier's power supply, which draws energy from a battery or power outlet. In most amplifiers, the difficulty of producing an effect in the main amplifier circuit is too much work for the original audio signal. For this reason, the signal is first boosted by a pre-amplifier, which sends a stronger output signal to the power amplifier. The pre-amplifier works the same basic way as the Amplifiers: The input circuit applies varying resistance to an output circuit generated by the power supply. Some amplifier systems use several pre-amplifiers to gradually build up to a high-voltage output signal.

The goal of a good amplifier is to cause as little distortion as possible. The final signal driving the speakers should mimic the original input signal as closely as possible, even though it has been boosted several times. Amplifier designs vary, with different designs being better for certain applications. If you need an amplifier for your home theater, your stereo system, your instruments or any other audio purpose, take a look in the links section for some of the best amplifier manufacturers around.

A custom designed, oversized low-flux toroidal transformer enables the 340A to delivers an impressive 40 watts per channel into 8 Ohms. An exceptionally low-noise preamp stage with sophisticated input switching technology complete the package and make the 340A the budget Amplifiers to beat.

The robust construction of the 340A is enhanced by a solid aluminium front panel and it is available in black or silver. The 340A offers a full complement of functions including five line level inputs with one tape loop, by-passable bass and treble controls and a headphone output. A second set of speaker outputs completes the impressive feature count.

Cambridge-Audio's trademark aluminium faced Azur remote handset provides full function control and can also be used to operate any Azur compact disc players or Amplifiers. The 340A can be matched to the 340C to form a highly specified budget hi-fi separates system!

Azur 640A Amplifier

The 640A builds upon the impressive features of the 540A resulting in a quality of performance you would expect from amplifiers costing considerably more. This development provides true audiophile levels of sound reproduction and takes the Azur marque to the highest level.

Output is 65 watts per channel into eight ohms and the inclusion of a Class 'A' follower driver stage, together with high quality polypropylene bypass capacitors reflects the attention to detail that sets the 640A apart from its rival Amplifiers.

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