Adobe Audition Low Pass Filter

There are different kinds of low pass filter, I personally use Butterworth filters in Adobe Audition order 66. Most commercial master recordings apply a low pass filter at around 16500Hz (this is done in the EQ stage of the mastering process). However, it is not popular to use a low pass filter in mixing process.

So you'll usually find a high-pass-filter set up in the low frequencies (in the Reaper pic, band #1 is a high-pass filter, but it is located on the left of the spectrum - the low part). And the opposite is true for a low-pass filter. So in reality you could call a high-pass filter a 'low-cut filter' and a low-pass filter a 'high-cut' filter. From Cool Edit Pro 1.2 right through to Audition 3.0 Ses2Sesx will convert these legacy sessions to the latest Adobe Audition CS5.5 session (sesx) format. The ses format has changed significantly over the years and developing this application has taken months of intense effort. LFE360 Low-Pass Filter (V9) - Latency The table below indicates how much latency is produced by each plugin, in samples. Not all plugins support all platforms (MultiRack, StudioRack, eMotion, Venue). Check the Supported Platforms table for more info. Set limits with high-pass filters and low-pass filters. These filters are important tools in any good EQ plug-in. A high-pass filter cuts the low frequencies and lets high frequencies pass through, while a low-pass filter does the opposite. Producer and mixer Lo Boutillette uses high-pass filters to cut the low basses.

HIGH SHELF FILTER

Definition: A high shelf filter will cut or boost signals of frequencies ABOVE “fc”. Below the cutoff frequency, the input signal is unaffected. This operates opposite to a low shelf filter. Below is the response output of a high shelf filter used in cutting signals above “fc”.

high shelf filter used in cutting

A common implementation of high shelf filter reduction is similar to a low pass filter such as noise filtering. Unlike a low pass filter which is designed only for “attenuation” or “cutting signals”. A high shelf filter can also be used to boost signals above the cut off frequency, such as below:

A typical example is boosting high frequencies. For example in a digital audio music mastering process, the engineer might noticed that there is a significant lack of high end frequency response. To solve this problem, the mastering engineer can use a high shelf filter to slowly boost the high end frequencies.

HIGH PASS FILTER

Definition: A high pass filter will pass signals of frequencies above the cutoff frequency unaltered and drastically attenuate signals of frequencies below that value. Just like low pass filter, a high pass filter is only used for the attenuation of signals or cutting. It is not designed for boosting. Below is a typical response output of a high pass filter:

High pass filter response example

As you have noticed, high pass filter operates similarly to the “cutting” mode of a low shelf filter. But high pass filter drastically reduces the signals below the cutoff as compared to a low shelf filter.A common implementation is when mixing bass guitar vs kick drums. In rock music, bass guitar commonly occupies the bottom subwoofer frequencies while the kick drum is above the bass guitar. The mixing engineer can use a high pass filter on kick drums to cut its lower bass spectrum in favor of the bass guitar.

I commonly use this filter during mixing but not so much in the mastering process. HPF can be applied to vocals, guitars and other string instruments to avoid mud with the bass guitar or bass frequencies.

One important distinction of high pass and low pass filters with the rest of the filters (like parametric equalizers) is the absence of Q in the settings. So if you are going to use high pass/low pass filters, you need to set one important value and that is just be the “cut off frequency”. Although in some scientific filters you need to set the “order”, which is the measure of steepness of the frequency attenuation

Summary

1.) A low shelf filter operates similarly with a high pass filter in cutting mode.
2.) A high shelf filter operates similarly with a low pass filter in cutting mode.
3.) A high pass filter is not the same as the low shelf filter because low shelf filters can be used in boosting signals while a high pass filter is limited only to attenuation.
4.) A low pass filter is not the same as a high shelf filter because low pass filter cannot be used to boost signals unlike a high shelf filter.

For best results, you might want to cut not more than -12dB on shelving filters. More than that, it is recommended to look into re-recording the affected track as over-EQ could introduce some artifacts. The maximum boost recommended would be around +3dB on high shelf boosting mode. You would also consider re-recording the track if you find to boost more than this amount. For example you find the cymbals and hi-hats sound lacking in treble definition, instead over-boosting it in mixing, it might be good that it would be re-recorded using proper microphone and placement.

Content last updated on June 14, 2012

You've heard it before. It's a common effect on lead vocals in pop music and has been for many year. I'm referring to the effect that makes the vocal sound like it's coming through a telephone line. In fact, when I think of this effect the first song that pops into my head is the song by ELO called, interestingly enough, Telephone Line. Other uses for the effect that are common include making the drums sound like they are being played over a phone line at the beginning of the song and then opening up the sound later in the song to the full thing.

The way this is achieved is by severely limiting the frequencies that are audible on the target track to a very narrow range in the 'mids' - between about 400 Hz and 4 KHz. See the picture on the right. You can use an EQ for this, or you can use frequency filters like the one in the picture in Adobe Audition called an FFT filter. FFT stands for Fast Fourier Transform, which you can learn more about here - In the Adobe Audition FFT filter, the preset is called 'OnHold 400-->4K,' the 'on-hold' part being a reference to being on the phone.

In Reaper, you can just add the ReaEQ equalizer effect that comes with the program, and change bands 1 and 4 to high-pass and low-pass, respectively, in the Type drop-down menu. Then drag the band circles until #2 is at 400 Hz and #3 is at 4KHz. Easy-peesy-lemon-squeezy!

BTW,in yet another attempt to confuse you the term high-pass filter actually means that you are preventing the low frequencies (those to the left of the target frequency) from being heard and only allowing the frequencies that are higher than that to 'pass' through the filter.

Now you know how to create that phone effect in your recordings.

Adobe Audition Low Pass Filter

By the way, if you want to learn more about Reaper recording software, check out our latest recording tutorial course The Newbies Guide To Audio Recording Awesomeness 2: Pro Recording With Reaper.