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avoiding rezonance
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Nectarios
Martian Arts
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Posted : Dec 4, 2008 12:17
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The most obvious and simple way of getting round this, is high passing with a low Q factor and then using a low shelf to tame the resonance boost from the filter's slope.
You don't need some special EQ for this, just take a good listen and dial in the right settings.
 
http://soundcloud.com/martianarts |
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Nectarios
Martian Arts
Started Topics :
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Posted : Dec 4, 2008 12:17
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Kane
IsraTrance Junior Member
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Posted : Dec 4, 2008 13:12
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^
If you're using a low Q and there's no resonant boost, why would you need a shelf too?
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Nectarios
Martian Arts
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Posted : Dec 4, 2008 13:21
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Because I have more control over the frequencies I am cutting all together and the ones I simply wanna pull down a bit.
I could do it by carefully selecting frequency, slope and Q factor, but sometimes I need to choose a high slope high pass filter, which I would rather not.
Not sure adding a gentle high pass filter and a low shelf on top is better than a steep slope high pass filter alone, concerning phase distortion, but it does sound slightly better to my ears.
http://soundcloud.com/martianarts |
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Sonica
IsraTrance Junior Member
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43
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Posted : Dec 4, 2008 13:44
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[quote]
On 2008-12-04 02:48, Elad wrote:
thnx colin obvious....
sonox looks very much OK
sonica im not on my computer then sorry i cant upload example
but its easy to uders
open waves Q 10
make the first filter HP , it comes with no options just 12db filter. Q wont do anything.
now repeat the process with more filters (in that same Q 10 , no.2 no.3 etc)
u can have them all on same point to get the "48db filter" if u use 4 bands.. sometimes i use even more.. but i rather to cut one time @ 31hz and another @ 50hz for example of bass... for other sounds lets say i remove 80hz to get rid of sub and then again @ 150hz to reduce bass as well but not all the way.. it will still lower the subs even more tho.. some sort of surgical cleaning 
good example too example pipe |
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Sonica
IsraTrance Junior Member
Started Topics :
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396
Posted : Dec 4, 2008 13:45
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Quote:
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On 2008-12-04 13:21, pipe&slippers wrote:
Because I have more control over the frequencies I am cutting all together and the ones I simply wanna pull down a bit.
I could do it by carefully selecting frequency, slope and Q factor, but sometimes I need to choose a high slope high pass filter, which I would rather not.
Not sure adding a gentle high pass filter and a low shelf on top is better than a steep slope high pass filter alone, concerning phase distortion, but it does sound slightly better to my ears.
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cheers pipe |
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Kane
IsraTrance Junior Member
Started Topics :
23
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1772
Posted : Dec 4, 2008 15:15
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Quote:
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On 2008-12-04 13:21, pipe&slippers wrote:
Because I have more control over the frequencies I am cutting all together and the ones I simply wanna pull down a bit.
I could do it by carefully selecting frequency, slope and Q factor, but sometimes I need to choose a high slope high pass filter, which I would rather not.
Not sure adding a gentle high pass filter and a low shelf on top is better than a steep slope high pass filter alone, concerning phase distortion, but it does sound slightly better to my ears.
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If you need a high Q HPF I would usually rather use a notch to get rid of the boost..whatever you sounds good to you though. 
You believe in the users?
Yeah, sure. If I don't have a user, then who wrote me? |
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Nectarios
Martian Arts
Started Topics :
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Posted : Dec 4, 2008 16:12
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A notch would still allow everything below it to pass through and I want everything below the high pass filter's cut off frequency, to be filtered out. You don't need that sub anyway. Most P.A.s don't really go that low and if they do, most FOH engineers will high the P.A. at the Omnidrive, or graphic EQ. Anyhow the reason I also use a low shelf EQ is to avoid using a high Q, steep slope high pass filter.
http://soundcloud.com/martianarts |
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Colin OOOD
Moderator
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Posted : Dec 4, 2008 20:57
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I think what Kane was getting at is:
Where you (pipe) said you'd use a low shelf to get rid of the resonance peak caused by a steep HPF, he would use a peaking EQ and set it up to counteract the resonant peak only, so you still had the steep filter but the peak was EQd out.
This is the way I tend to do it too, as it leaves it open to then use a low shelf to reduce the volume of low-range frequencies above the HPF point. Steep filter cutting out the sub, controlled low-range, no resonant peak. Winnar.
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UnderTow
Started Topics :
9
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1448
Posted : Dec 4, 2008 21:13
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Quote:
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On 2008-12-03 20:22, Colin OOOD wrote:
Here is an EQ test (aka a bunch of JPEGs of spectrum analysis of various EQ plugins all doing the same kind of thing) I did which will hopefully show why I advise staying well away from Waves LinEQ Lowband for hipass filtering.
http://www.sendspace.com/file/7oetcx
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I haven't checked the plots but I think the LinEQ sounds grainy and ugly. Best avoided (at any frequency for any purpose).
UnderTow |
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Nectarios
Martian Arts
Started Topics :
187
Posts :
5292
Posted : Dec 5, 2008 02:20
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Quote:
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On 2008-12-04 20:57, Colin OOOD wrote:
I think what Kane was getting at is:
Where you (pipe) said you'd use a low shelf to get rid of the resonance peak caused by a steep HPF, he would use a peaking EQ and set it up to counteract the resonant peak only, so you still had the steep filter but the peak was EQd out.
This is the way I tend to do it too, as it leaves it open to then use a low shelf to reduce the volume of low-range frequencies above the HPF point. Steep filter cutting out the sub, controlled low-range, no resonant peak. Winnar.
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The thing though is that I wanna avoid using any kind of high Q/steep filter settings to cater for as less as possible phase distortion of the incoming signal. Not that I don't go for high Q drastic subtracive EQ. My screen shot shows that I do use a steep notch to get rid of one narrow band, all together. But as far as the bottom end is concerned I do get away with gentle high passing and pulling down the bottom end around the root frequency.
I am not sure that is whats best, but it does sound fine, to my ears at least...although in theory, it does make more sense to just use a notch to get rid of the steep high pass filter boost...but then again I don't even use a steep/high Q high pass filter to start with.
I am lost as in what is best to use really.
http://soundcloud.com/martianarts |
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Kane
IsraTrance Junior Member
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Posted : Dec 5, 2008 07:31
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Exactly what I was saying Colin. I think if you use a shelf to try to get rid of a resonant boost, the resonance will still be there, you're just bringing an entire section (the resonant boost and around it) of the bass down.
pipeandslippers, I think to have no phase distortion you would have to use a 6db/oct HPF..way too smooth imo to just cut out some really low bass. I would just go with a linear phase eq, higher Q HP and a notch to get rid of the resonance..in most cases you can do all of that in the same eq and you'll be able to see that there's no resonant boost..barely any audible difference to me.
You believe in the users?
Yeah, sure. If I don't have a user, then who wrote me? |
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Nectarios
Martian Arts
Started Topics :
187
Posts :
5292
Posted : Dec 5, 2008 09:36
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