Noise Amplifier

AUDIOVALVE EKLIPSE Ouptut Impedence 50Ohms Noise 005mV Pre Amplifier Amp
Paypal

US $5,429.99

LNA ULTRA BROADBAND 100 MHz 20 GHz LOW NOISE AMPLIFIER SMA NF 46 dB Gain 24 dB
Paypal

US $2,449.00

LNR Low Noise Amplifier Switch
Paypal

US $1,250.00

X Band GFE LNA Low Noise Amplifier 20453478 NEW LXA7550 Vertex RSI
Paypal

US $875.56

LNA GPS low noise amplifier 1227 to 1575 MHz 045 dB 12 13 14 15 16 GHz
Paypal

US $599.00

X Band GFE LNA Low Noise Amplifier 20458531 LXA7550 Vertex RSI USED MAXTECH
Paypal

US $562.86

Noise Amplifier

Selecting The Best Audio Amplifier For Your Speakers

Looking at latest audio amplifier products, one cannot help but be daunted by the number of technologies and models. Regardless of your application, I will explain some key amplifiers vocabulary which will be useful when selecting the best type.

An audio amplifier will connect your audio source with your speakers by converting the rather weak source signal into a strong adequate signal to drive your speakers.

Depending on your application, you might want to go with a source that already has a built-in amplifier. On the other hand, utilizing a separate amplifier will give you more versatility in choosing the model that best complements your speakers. Some of today's miniature amplifier types can be concealed nearly everywhere due to their small size.

Many people will look at amplifier wattage first when choosing an amplifier. Output wattage is the level of energy the amplifier is able to deliver to the speakers. Driving low-sensitivity speakers (sensitivity is expressed in dB/W) calls for fairly high wattage. Furthermore, driving outdoor speakers or speakers in a large room will require higher amplifier power. However, be cautious not to overdrive your speakers. This can damage your speakers beyond repair.

However, a 20 to 50 Watt amplifier will give you more than sufficient power in many situations so don't be overly concerned about the rated amplifier wattage.

Amplifier output power is given in Watts rms (continuous) and Watts peak. The rms or continuous value tells you how much power the amplifier can provide continuously whilst the peak power figure tells the highest wattage that the amplifier can deliver for short intervals of time. You should choose an amplifier that has adequate rms power, although 10 to 30 Watts should be plenty for most applications but has adequate headroom for peaks that happen in music signals.

There are additional parameters that are more essential than wattage when selecting an amplifier. One imperative parameter is called total harmonic distortion or THD in short. Every amplifier will introduce some imperfections into the audio signal which is referred to as distortion and expressed in percent or dB. A smaller distortion number means a lower distortion of the audio signal by the amplifier. Audiophile amplifiers will have distortion numbers of typically less than 0.05%. Consumer-grade amplifiers will have distortion figures of up to 10%.

Signal-to-noise ratio is another amplifier characteristic. This number describes the amount of noise which the amplified will add to the audio. The figure is expressed in dB. Audiophile-grade amps will have an SNR of 100 dB or higher. Consumer-grade amps will have at least 80 dB signal-to-noise ratio.

There are several amplifier technologies available. Modern amplifiers are mostly Class-D amplifiers. Class-D amplifiers have a high power efficiency and waste little energy as heat. Some of today’s mini amplifiers are no bigger than a deck of cards. Class-D type amplifiers often have higher distortion and a lower signal-to-noise ratio than Class-A or Class-AB amplifiers. Some latest digital amplifier models, however, come very close to the audio quality of analog amps. Make sure that the amp has low distortion and a high SNR if you choose a Class-D amp.