What is rolling off?
I know, these phrases banded about by everybody ‘in the know’ are confusing.
Put simply rolling off is a curve.
See the pictures below,
These pictures are designed to show what a curve will look like when applied.
They’re only represenations but it’s a good way to understand what an EQ curve looks like.
This kind of curve is usually referred to a ‘high pass’
A ‘low pass’ looks like this,
A curve as you can see ‘curves’ off the frequency in a gentle ‘slope’ .
The severity or amount of ‘curve ‘ is created by the amount of ‘Q/Bandwidth’ + ‘Gain’
A ‘High Pass’ removes low frequencies
A ‘Low Pass’ removes high frequencies.
To try and remove a little confusion keep shelves and passes seperate.
Learn what a ‘High Pass’ and a ‘Low Pass’ do first – then try a ‘Band Pass’
A band-pass filter is a ‘high-pass filter’ and a ‘low-pass filter’ combined to allow only a band of frequencies to pass through.
A ‘low shelf’ will affect low frequencies up to a certain point and then above that point will have little effect.
A ‘high shelf’ affects the level of high frequencies, while below a certain point, the low frequencies are unaffected.