Suggestions For Making An Informed Decision Whilst Shopping For Music AmpsThe frequency response is quite possibly the most frequently found parameter to define stereo amplifiers. However, it can often be misleading and may not really give a good sign of the sound quality. In order to help you make a wiser buying decision, I'll clarify what this specification means and how to understand it. If the frequency range is 20 Hz to 20 kHz as an example, the amplifier would be able to amplify any signals with a frequency greater than 20 Hz and less than 20 kHz. Inside this range, the amp gain is largely constant. At the upper and lower cutoff frequencies the gain is going to decrease by no more than 3 decibels.
Additionally, just considering these 2 numbers doesn't say a lot about the linearity of the frequency response. However, most manufacturers will not publish these in which case you ought to contact the maker directly. In fact amps might have different frequency responses depending on the speaker that is attached.
A varying speaker load will affect the filter response to a point. Several of the newest digital audio amps feed back the music signal after the lowpass filter so as to compensate for this drawback and to make the frequency response of the amplifier independent of the attached load. Every single output was designed to attach a different speaker load.