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master buss hpf rolloff

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master buss hpf rolloff

Postby The Sponge » Thu May 17, 2018 7:54 am

I noticed in the March issue of this fine publication, Both the Greg Wells and the Mixing & Mastering modern metal article by Mark Mynett talk about hpf at 39/40hz.
My lack of experience has led me to just setting it at 20hz, But I was wondering if there is a rule of thumb on this or is it depended on the program material, Edm at a lower setting than country etc and at what slope ? or do you have a set and forget setting.
thanks all.
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Re: master buss hpf rolloff

Postby blinddrew » Thu May 17, 2018 8:36 am

I always tend to do it by the material. If I've got a fairly prominent double bass part then I'll set it fairly low (but fairly steep), if it's something which doesn't need it (just guitar and voice for example) then I'll run it much higher. If you're working with a sub-heavy style then you'll probably want to go lower still - as long as things are still under control.
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Re: master buss hpf rolloff

Postby The Elf » Thu May 17, 2018 8:48 am

For starters I wouldn't put an HPF over the master buss. The place to sort this out is on the individual channels. Clean it up at the start and you can forget about it. You can also target each source with an appropriate setting - you'd have a far higher HPF frequency on a hi-hat channel than a kick drum.

Then it's all about ears, good monitoring and a spectrum display. Don't look for rules (there are none, anyway) - work with the audio you have and react to what it tells you it needs.
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Re: master buss hpf rolloff

Postby Wonks » Thu May 17, 2018 9:10 am

Generally as The Elf says. I'd always clean each channel first in a mix. But it does depend on what FX you've got on your master buss. If you've got something that's pushing up the bass levels significantly during the mastering process (lots of compression or limiting), then it may be worth putting a high pass filter in after those FX in the chain just to keep the very low frequencies under control if they've been boosted significantly. If not, then there's no need for it.
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Re: master buss hpf rolloff

Postby Hugh Robjohns » Thu May 17, 2018 9:30 am

The Elf wrote:For starters I wouldn't put an HPF over the master buss. The place to sort this out is on the individual channels. Clean it up at the start and you can forget about it. You can also target each source with an appropriate setting - you'd have a far higher HPF frequency on a hi-hat channel than a kick drum.

Repeated for emphasis -- this is the correct approach in my view. If you're HPF-ing the master bus it's all too little too late in my opinion!
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Re: master buss hpf rolloff

Postby blinddrew » Thu May 17, 2018 9:36 am

It's probably paranoia on my part, i hpf everything individually but I'm very aware that i struggle with analysing the low end so a bit of belt and braces shouldn't do any harm, after all, there's nothing there i want to keep.
On a related note though, even after applying hpfs at source and bus stages, my master eq still shows plenty of activity at the bottom end. Am i just not being brutal enough with my slopes?
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Re: master buss hpf rolloff

Postby Hugh Robjohns » Thu May 17, 2018 10:09 am

Possibly. And remember that compressors will tend to raise the low end tails too.

Reverbs can also generate a lot of unwanted low end -- so it's often worth high-passing the input to a reverb (or sometimes the output)
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Re: master buss hpf rolloff

Postby The Sponge » Thu May 17, 2018 10:12 am

I have been doing the individual channel thing as a matter of course, a hpf is the first step I take and then eq from there, So It sounds like I have been taking the right aproach for the most part. Thanks all for your replys.
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Re: master buss hpf rolloff

Postby Wonks » Thu May 17, 2018 10:14 am

I'd be a bit wary of the frequency displays shown on live EQ displays as I find they often show very low frequencies that simply aren't there, (as I know from when I've just used a very steep HPF first at a much higher frequency setting for test purposes) probably as a result of short 'moving window' time periods which cause inaccuracies in the frequency calcs. I find that if I use an offline frequency response tool in my DAW to check a section of a waveform, those low frequencies that show up on a moving display simply don't show on a static one.
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Re: master buss hpf rolloff

Postby Hugh Robjohns » Thu May 17, 2018 10:35 am

Wonks wrote:I'd be a bit wary of the frequency displays shown on live EQ displays as I find they often show very low frequencies that simply aren't there...

Very true. The spectral analysis in the EQ plugs is often configured with a very short FFT length to make it fast and responsive, but light on processing horsepower. As a direct result, the low end measurements are very inaccurate and tend to look much more evil and busy than they really are. A longer FFT will help to improve the accuracy, if that option is available.

A bargraph-style 1/3 octave 'real-time analyser' (RTA) is often a better choice of meter for assessing the low-end energy as you check individual channels and mixes, although it doesn't look as impressive!

H
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Re: master buss hpf rolloff

Postby Zukan » Thu May 17, 2018 1:51 pm

I band pass every channel and still HPF the master bus. Both sounds and processes will invariably generate sub harmonics through interaction and summing. Good to filter those out too but with a gentler slope than the required aggressive slopes for channel band passing.
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Re: master buss hpf rolloff

Postby The Bunk » Thu May 17, 2018 3:33 pm

blinddrew wrote:On a related note though, even after applying hpfs at source and bus stages, my master eq still shows plenty of activity at the bottom end. Am i just not being brutal enough with my slopes?

Good man Drew, that's been on my "Should I ask this question or not?" list for a while...
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Re: master buss hpf rolloff

Postby Forum Admin » Thu May 17, 2018 3:39 pm

The Bunk wrote:
Good man Drew, that's been on my "Should I ask this question or not?" list for a while...

Never be afraid to ask what might seem like daft or obvious questions in the SOS Forum. Nobody is going to call you out -- there's so much to learn and we're all on this great journey together.
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Re: master buss hpf rolloff

Postby The Bunk » Thu May 17, 2018 4:03 pm

Forum Admin wrote:
The Bunk wrote:
Good man Drew, that's been on my "Should I ask this question or not?" list for a while...

Never be afraid to ask what might seem like daft or obvious questions in the SOS Forum. Nobody is going to call you out -- there's so much to learn and we're all on this great journey together.

Of course, and I can speak from experience :thumbup: But isn't it refreshing when someone else asks a question which makes you think "Ah, it's not just me then"!
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Re: master buss hpf rolloff

Postby Martin Walker » Thu May 17, 2018 7:51 pm

Zukan wrote:I band pass every channel and still HPF the master bus. Both sounds and processes will invariably generate sub harmonics through interaction and summing. Good to filter those out too but with a gentler slope than the required aggressive slopes for channel band passing.

A bit belt AND braces, but then Zukan does often work in EDM and hip hop, where low end can be both extreme and very desirable when performed correctly.

Low cutting individual channels as needed, does makes perfect sense, and rolling off top end from some sounds in these more 'creative' genres can indeed create more space in the final mix.

If you still need to HPF the master buss then at least doing it first channel by channel will require less extreme settings across the entire mix, which makes perfect sense to me.


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Re: master buss hpf rolloff

Postby blinddrew » Thu May 17, 2018 9:14 pm

Thanks folks, really useful responses as usual. :)
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Re: master buss hpf rolloff

Postby varunbkk » Thu May 31, 2018 8:27 am

It is usually OK to roll-off below 24-30 Hz to get rid of any potential rumble.
This can sometimes help to clean up the low-end across a mostly completed mix.

If you're finding that you need to high-pass more drastically,
it's better to go back and address the problem on the individual channel(s).
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Re: master buss hpf rolloff

Postby ef37a » Thu May 31, 2018 8:55 am

I cannot help but think all that design time and effort to make DC coupled gear with fancy servos is a bit of a waste?

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Re: master buss hpf rolloff

Postby James Perrett » Thu May 31, 2018 3:16 pm

ef37a wrote:I cannot help but think all that design time and effort to make DC coupled gear with fancy servos is a bit of a waste?

It's great for measuring earthquakes though.
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Re: master buss hpf rolloff

Postby ef37a » Thu May 31, 2018 3:18 pm

James Perrett wrote:
ef37a wrote:I cannot help but think all that design time and effort to make DC coupled gear with fancy servos is a bit of a waste?

It's great for measuring earthquakes though.

Probably need a longer integration time than the average 'cork sniffer's' mic pre?

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