All frequencies above the specified cutoff frequency are allowed to pass, attenuating all frequencies below.Ī low pass filter passes a band of frequencies extending from a user-defined cutoff frequency (less than infinite) down toward the low end of the frequency spectrum. This allows you to control the amplitude of each band, shift the center of frequency, and widen or narrow the affected area.Ī high pass filter passes a band of frequencies extending from a user-defined cutoff frequency (greater than zero) up toward the high end of the frequency spectrum. MVC 121 Plus book, and DMP 44 LC book (depending on device) for more information.Ī parametric EQ is a variable equalizer that offers control of all parameters, including amplitude (boost or cut), center frequency (frequency), and bandwidth (Q). See the "Filter Operation" section in the DMP 64 book, MPX Plus 866 A book, MLS 608 D Series book, Typical filters are low pass, high pass, and band pass.Īn equalizer (EQ) is a type of filter that corrects for losses in the transmission of audio signals, making the output equal to the input, or making an otherwise inconsistent frequency response "flat," giving all frequencies equal energy.
Of course they both work the same way but in the other direction when boosting instead of cutting.About Filters and EQ About Filters and EQĪ filter is a device that attenuates or removes a user-defined range of frequencies from an audio waveform while passing other frequencies. in effect creating a flat "shelf" of EQ cut at -5dB.Ī standard low cut/high pass filter does not level off - it does not create a "shelf", it instead keeps sloping downwards in a continuous csope as the frequencies lower until either we run out of frequencies or run out of volume. What will happen is starting somewhere around 60Hz, the EQ will slope down as the frequency goes down until it hits the -5dB level of cut requested and then level off at -5dB for the remaining lower frequencies.
Whereas a pass or cut applies a more-or-less continuous slope up or down of x number of dB per octave.įor example, let's say you set a low shelf to cut low frequencies starting at around 60Hz. it flattens out at a certain level of dB cut or boost. A shelf is called a shelf because it kind of resembles a shelf i'e. The main difference between a shelf and a cut or pass filter is the shape of the EQ curve applied.
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