BigDrez
THD is the rating of that.
Its a start. Someone else can probly explain it more in depth.
This is actually how i got started in electrical engineering, interest in car audio amplifiers.
distortion is something that changes a signal based upon the signal.
Distortion can be linear or nonlinear.
linear distortion is changing the signal by changing the magnitude or phase of the frequencies that already exist. eg, any EQ or time delay or amplification. This type of distortion is not typically concidered to be bad for audio.
nonlinear is distortion that adds new frequency components to the signal. this leads to
total harmonic distortion -- new frequncies added at positive integer multiples of the input signal's frequency. eg input is 100hz, output has components at 100hz and (harmonics) at 200, 300, 400hz, ect...
intermodulation distortion -- when two tones play, they generate distortion at of the sum and differences of positive integer multiples of the tones. eg 100hz and 110hz play at the same time. there will be IMD at 210hz, 10hz, 420hz, 20hz, 190hz, 120hz, ect...
non-harmonic distortion -- this is when the added frequencies are not integer multiples of the input signal.
stereo seperation is defined as how much of the signal from the left channel bleeds over to appear on the right channel output. eg, if you unplug the right channel and the left speaker, do you get any sound on the right speaker due to the left channel? you should not, but a small amount of signal might come through.
SNR is a similar concept. noise is defined as a modification to a signal that is not based upon that signal. if you have the amp turned all the way to the rated power, the signal should overpower the noise. but the amp will generate some noise. a high SNR means that there will be less noise. turning down the volume usually decreases SNR -- there signal strength goes down, but the noise is not related to the signal, and stays the same, thus signal/noise decreases.
distortion is something that changes a signal based upon the signal.
Distortion can be linear or nonlinear.
linear distortion is changing the signal by changing the magnitude or phase of the frequencies that already exist. eg, any EQ or time delay or amplification. This type of distortion is not typically concidered to be bad for audio.
nonlinear is distortion that adds new frequency components to the signal. this leads to
total harmonic distortion -- new frequncies added at positive integer multiples of the input signal's frequency. eg input is 100hz, output has components at 100hz and (harmonics) at 200, 300, 400hz, ect...
intermodulation distortion -- when two tones play, they generate distortion at of the sum and differences of positive integer multiples of the tones. eg 100hz and 110hz play at the same time. there will be IMD at 210hz, 10hz, 420hz, 20hz, 190hz, 120hz, ect...
non-harmonic distortion -- this is when the added frequencies are not integer multiples of the input signal.
stereo seperation is defined as how much of the signal from the left channel bleeds over to appear on the right channel output. eg, if you unplug the right channel and the left speaker, do you get any sound on the right speaker due to the left channel? you should not, but a small amount of signal might come through.
SNR is a similar concept. noise is defined as a modification to a signal that is not based upon that signal. if you have the amp turned all the way to the rated power, the signal should overpower the noise. but the amp will generate some noise. a high SNR means that there will be less noise. turning down the volume usually decreases SNR -- there signal strength goes down, but the noise is not related to the signal, and stays the same, thus signal/noise decreases.
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