Szerkesztővita:AnnettBinns5
Eltévedtél !!! Ez magyar szótár, nem levelező oldal:--karesznincs vita 2016. október 18., 14:20 (CEST)
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Thank you! --EGalvez (WMF) (talk) 2017. január 13., 23:26 (CET)
Selecting a good audio amp for your speakers is not a trivial job. You want to ensure that your amplifier matches your loudspeakers. I will clarify some essential amplifier vocabulary and give some suggestions to help you select the best amplifier.
Audio amplifiers come in all different shapes and sizes. They utilize different technologies and have numerous technical specs. However, you don't need to be an expert to select the perfect type. By following some basic rules you won't regret your buying decision.
Amplifiers vary in their size and range from types that will take up a good part of your living room whilst a number of of the most recent mini amplifier models are as tiny as a deck of cards. Various amplifiers are rack sized. This enables them to be stacked on top of your other audio equipment. The huge majority of modern audio amps are solid state amplifiers versus more conventional tube amps. Tube amps have been prevalent a decade or so ago. Tube amplifiers, though, have a rather high amount of harmonic distortion. Harmonic distortion describes how much the audio signal is degraded whilst being amplified. This expression is often used while evaluating the audio quality of amps. An audio distortion of up to 10% is characteristic for tube amps whereas solid-state amps have less audio distortion depending on the particular technology. The most traditional amps utilize a "Class-A" and "Class-AB" technology. These amps are also labeled "analog amplifiers". This technology provides fairly small audio distortion. However, the power efficiency is merely 10 to 30%. This means that most of the electrical power supplied to the amp is wasted as heat while a tiny fraction is used to amplify the audio signal. "Class-D" amplifiers, on the other hand, which are also referred to as "digital amplifiers" have a power efficiency of no less than 80% and are smaller and have a smaller power supply than similar analog amplifiers. The disadvantage is that many digital amps have higher audio distortion than analog amplifiers although a number of of the latest types make use of a feedback mechanism to reduce distortion to levels of 0.05% and lower. The amplifier should be able to deliver adequate output power to sufficiently drive your speakers which will depend not only on how much power your loudspeakers can handle but also on the size of your listening area. Loudspeaker power handling ability is specified as peak power and average power. The peak power value refers to how much power the speaker can handle for a short period of time whilst the average power handling value describes how much power you can drive the speaker at continuously without harm. If your listening environment is relatively small then you might not require to drive your loudspeaker to its rated power handling value. You would probably be ok having an amplifier that can deliver 20 to 50 Watts while your loudspeakers may be capable to handle 100 Watts of power. Low-impedance loudspeakers typically offer high sensitivity and are easier to drive to high volume than high-impedance loudspeakers. Not all amps can drive every speaker impedance. Find out the impedance of your speaker which is given in Ohms. Then look at your amplifier manual to make sure that your amplifier can drive this impedance.
Finally, make certain that your amp introduces little noise and has a broad enough frequency response. High-quality amplifiers will have a signal-to-noise ratio of at least 100 dB and a frequency response of no less than 20 Hz to 20 kHz.
karesznincs vita 2017. február 28., 16:29 (CET)
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