The reverberation mentioned in it is actually ringing, which is usually translated as ringing, which is completely different from the reverberation often mentioned in listening environment. This kind of ringing is a unique phenomenon of digital filters, and there are two kinds of ringing before and after.
There are two common digital filters in dac, fir and iir. FIR will ring before and after, but the phase delay of each frequency is the same, so the output sound is delayed, but there is no phase distortion in theory. IIR will have phase distortion, but there is no pre-ringing, so the transient response should be better.
Principle introduction
The power filter is a "low-pass filter" composed of inductance, capacitance and other materials. It can block the noise above the frequency point of a specific frequency only by letting the frequency point of the specific frequency or below it pass, thus eliminating the interference and noise in the power grid, making the power transmission smoother and more stable, and fully ensuring the sound quality of the sound system.
Audio power filters are divided into inductive and non-inductive types. Generally, the non-inductive power filter is used, because the non-inductive filter can better suppress the clutter current, the output current is faster, the sound quality performance is wider, the details are richer, and the low-frequency dynamic expansion is better.
The application of audio power filter improves the sound quality of low-power electrical appliances such as CD player, DVD player and front stage. , mainly background noise. The effect is also outstanding in the application of car audio. However, if it is used for home high-grade HIFI audio, it needs to be equipped with high-quality power filter. Improper configuration of common power filter will limit current output and affect the effect. When applied to ordinary audio equipment, it can only make the sound cleaner, and improving the sound quality is only a psychological comfort.