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10ndaYii

Joined: 11/04/12
Posts: 94

High Pass . . . Low Shelving ?
#984178 - 25/04/12 12:33 PM

What's the different between a high
pass filter and a low shelving EQ

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Sam Inglis
SOS Features Editor

Joined: 15/12/00
Posts: 1386

Re: High Pass . . . Low Shelving ? new

[Re: 10ndaYii]
#984180 - 25/04/12 12:36 PM

A high-pass filter progressively eliminates more and more of the frequencies below the cutoff point, whereas a low shelving cut attenuates all frequencies below the cutoff point equally.

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10ndaYii

Joined: 11/04/12
Posts: 94

Re: High Pass . . . Low Shelving ? new

[Re: 10ndaYii]
#984192 - 25/04/12 01:17 PM

thanx

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SafeandSound Masteri...

Joined: 23/03/08
Posts: 852
Loc: London UK

Re: High Pass . . . Low Shelving ? new

[Re: 10ndaYii]
#984223 - 25/04/12 02:53 PM

Have a little look here:

How to use an EQ

Cheers

SafeandSound Mastering

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Hugh Robjohns
SOS Technical Editor

Joined: 25/07/03
Posts: 18399
Loc: Worcestershire

Re: High Pass . . . Low Shelving ? new

[Re: 10ndaYii]
#984228 - 25/04/12 02:59 PM

This image shows the effect of a 3rd order (18dB/octave) high-pass filter with a turnover at 100Hz (green line), and a low shelf cut of -12dB, also set to 100Hz (blue line) on a white noise signal (red line).

As you can see, the high pass filter's slope just goes on down, providing ever-more attenuation as the frequency gets lower, where as the low shelf looks just like a shelf -- it reduces the signal to a set level below the turnover frequency, but no more.

Shelf equalisers can also boost the signal, whereas a filter can only cut.

Hugh

--------------------
Technical Editor, Sound On Sound

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Hugh Robjohns
SOS Technical Editor

Joined: 25/07/03
Posts: 18399
Loc: Worcestershire

Re: High Pass . . . Low Shelving ? new

[Re: SafeandSound Mastering]
#984231 - 25/04/12 03:08 PM

Quote SafeandSound Mastering:

Have a little look here:

How to use an EQ

Or you could look here:

SOS EQ Exploration

or here:

SOS Equalisers Explained

or here:

SOS Using Equalisation

or here:

SOS What's the Frequency?

or here:

SOS EQ: How and When To Use it

hugh

--------------------
Technical Editor, Sound On Sound

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Andi

Joined: 02/09/04
Posts: 1083
Loc: Berkshire, UK

Re: High Pass . . . Low Shelving ? new

[Re: Hugh Robjohns]
#984542 - 26/04/12 09:27 PM

Quote Hugh Robjohns:

Quote SafeandSound Mastering:

Have a little look here:

How to use an EQ

Or you could look here:

SOS EQ Exploration

or here:

SOS Equalisers Explained

or here:

SOS Using Equalisation

or here:

SOS What's the Frequency?

or here:

SOS EQ: How and When To Use it

hugh

So I'm getting that this so-called "EQ" stuff is important then?

--------------------
Andi, www.thedustbowl.net Mixing, Mastering, Audio Editing at The Dustbowl Audio

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Stef Andrews

Joined: 04/07/07
Posts: 435
Loc: Sussex, UK

Re: High Pass . . . Low Shelving ? new

[Re: Andi]
#984545 - 26/04/12 09:55 PM

Quote Andi:

So I'm getting that this so-called "EQ" stuff is important then?

I wouldn't bother with EQ - just cover up any mess with masses of reverb and delay!

However, those articles are all excellent. Well worth the time it takes to read through them!

--------------------
www.sda-audio.co.uk

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