shelves and filters?

[BADMANN]

can someone here explain the difference between a low shelf and low pass filter as well as high pass and high shelf? ive been using waves q10-q2 eq but i dont know the right situation for each im pretty familiar with low and high pass but the shelves id like to know whats the right situation to use a high or low shelve over a high or low pass filter?
thx in advance for any info i receive!!!

[steffen]

Shelving filters

Shelving filters, unlike those described above, boost or cut from a determined frequency until they reach a preset level which is applied to the rest of the frequency spectrum. This kind of filter is usually found on the treble and bass controls of home audio units. .....



..... A high pass filter allows only frequencies above the cutoff frequency to pass through unaffected. Frequencies below the cutoff frequency are then attenuated at a constant rate per octave. Low pass filters operate similarly, except that only frequencies below the cutoff are allowed to pass through. Common attenuation rates are 6, 12, and 18 dB per octave. These filters are used to reduce noise and hiss, eliminate pops, and remove rumble. It is common to use a high pass filter (at about 60 to 80 Hz) when recording vocals to eliminate rumble.

source: Equalization filter - Wikipedia, the free encyclopedia

[Ethan Winer]

Originally Posted by BADMANN

can someone here explain the difference between a low shelf and low pass filter as well as high pass and high shelf?

A shelf has a corner frequency, and the response rises or falls above or below, then eventually levels out at some maximum boost or cut. A high-pass or low pass filter has a continual fall-off (no boost, only cut) at a rate of 6 or 12 or 18 etc dB per octave.

--Ethan