roll offs
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Posted on Jun 02, 2003 08:54 pm
brock
Member Since: Jun 28, 2002
ok i've been learning ALOT latly since someone posted a link for a spectrum analizer. i've been watching and comparing the images to ones of cds that i wish to sound like...i try to find parts of songs wear there is nothing put a snare or bass drum and see how there eqed. i've always heard how people have there snare roll off at 80...and yeah i see that alot...is there a differece between roll off and hi pass? when you guys say "roll of at 80" i just send the hi pass to 80. when i look at the SA the signal dosn't roll of at 80 it takes way to far to roll off completly. its around 40 or somthing. i kept adding eq bands all set as hi pass at 80 and it took me 6 untill my signal rolled off at 80..it sounds remarkabley better but should it be taking me 6 bands of eq to roll it off?!!??! sorry if i seem like a complete idiot
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juesContributor
Since: Dec 30, 2002
Jun 02, 2003 09:11 pm First off, yes, a "Roll Off" is a High-Pass Filter. (HPF)
The response you are noticing is to be expected, a High Pass Filter is not a brick wall filter - that is to say that it does not kill everything under 80Hz (or whatever it's set to) - instead it "Rolls off" the frequencies below 80Hz in a smooth fashion - that's why it can take a certain amount of Hz to completly dissapear.
jues.
brockMember
Since: Jun 28, 2002
Jun 02, 2003 09:13 pm so when i see other bands snare drums for exaple having a boost at 200 but also have the freqenceys stop at 80 or so does this mean that they used a bunch of bands to cut it off like a brick wall?
juesContributor
Since: Dec 30, 2002
Jun 02, 2003 09:20 pm Most probably - or the applied a LPF at 200Hz combined with a nice phat boost there with a seperate band (set to bell).
Give that a shot - that will probably give you the desired effect.
Jun 03, 2003 01:24 am A great way to steepen the roll-off slope is to use multiple "bands" or "poles" (not sure what those are called) of parametic EQ, but you won't need 6 of them. 2 or 3 total will do.
start with the HP roll off at 80Hz like you had before for example, and add a second pole around the 40Hz where it becomes a more absolute reduction, drop it the full -15dB or whatever if nessesary, and then adjust the Q until you're getting the curve you want. A third or fourth band will give you even more control.
It def helps to have a spectrum analyzer to look at.
