Undestanding high/low pass, high/low cut?

[Deleted User]

Can anyone shed some light on the undestanding of high/low pass, high/low cut?
Are they the same? Do the controls of increasing and decreasing them work differently based on which app your using?
For 2 reference apps im using Eos2 high cut low cut (def confused on these) and Aufx space lpf cutoff hpf cutoff.
Trying to get my ears, brain and fingers on the same page.
Thx

ka010

They're the same.

Low Cut = HighPass, HighCut = Lowpass

AndyPlankton

High/Low this means affect the frequencies above (high) or below (low) the frequency cutoff
Pass/Cut Allow (pass) or remove (cut)

So High Pass will only let through frequencies above the Frequency cutoff
..Low Cut will remove frequencies below the frequency cutoff
These two are effectively the same, they both only let through the higher frequencies...but they will work slightly differently, any audible differences will be around the frequency cutoff.

Hope this helps !

Korakios

Generally speaking low cut = high pass . They serve the same purpose.
The difference between plugins is in the algorithm , that may introduce harmonics ,phase cancellations etc resulting (minimal or huge) difference in audio spectrum.
For hardware there are also different options . For example a high pass filter can have variations on the design
https://electronics.stackexchange.com/questions/285172/pros-cons-differences-of-high-pass-inductive-vs-capacitive-filter

[Deleted User]

The user and all related content has been deleted.

Artefact2001

@Dawdles said:
YouTube is your friend.

But this forum is friendlier

@breilly Easiest way to remember is...

Low pass — letting the ‘low’ frequencies ‘pass’
Low cut — ‘cutting’ the ‘low’ frequencies

Simples!

u0421793

The top one, you’ll notice, has all the low frequencies below the cutoff being passed without hindrance (or filtering), while the frequencies above the cutoff are progressively being hindered so their amplitudes are progressively less and less the higher up you go. This kind of slope might be described as, for example, something like 12dB or 18dB per octave, or even steeper, 24dB per octave (it cuts down by 24 decibels, for every octave you go higher than the cutoff freq.). Hence, we could call this a low-pass filter, or if we felt like it, we could call it a high-cut filter. It is passing the low frequencies, it is cutting the high frequencies.

The bottom one is the other way round – we could call that a low-cut filter, or we could call it a high-pass filter. Same thing. The slope description (12dB/8va; 18dB/8va; 24dB/8va) works the other way, that amount of decibels cut down, for every octave you go lower).

Notice I’ve drawn a slight bump at the cutoff frequency in both cases. If there wasn’t a bump, but a gentle round ‘knee’, where the slope starts, that’d be the same as having the resonance knob down to zero. The small bump I’ve drawn is about the resonance a quarter of the way up, so it pronounces the cutoff frequency a bit more than the rest. Push the resonance up further, that bump becomes a peak, and keep pushing it up, the whole filter goes into self-oscillation at that specific frequency (if it were analogue – doing that with digital is the difficult thing, a good one will make it sound like the analogue equivalent would have behaved at that point).

1nsomniak

And why does AUM have 2 versions of an All-Pass filter, seems like that does nothing!

rs2000

@1nsomniak said:
And why does AUM have 2 versions of an All-Pass filter, seems like that does nothing!

An All-pass filter will not affect the amplitude frequency response of your signal, but it will apply a short (and sometimes adjustable) phase shift.
This is inaudible on one channel alone, but can be used in an fx chain to correct unwanted phase issues, or it can be used with feedback and maybe multiple stages of All-pass filters to create phasing effects.
You don't need it everyday so many apps don't have them.

1nsomniak

@rs2000 ah thanks for the explanation