stupid eq tricks

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Member Since: Mar 05, 2003

I just looked at the stupid eq tricks article and am quite confused about some of the terminology used. cut, boost, rolloff? can someone shed some light on this?

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Prince CZAR-ming
Since: Apr 08, 2004

Jan 29, 2006 10:35 pm

cut is to reduce the output level of a frequency range. Like on a stereo receiver, or a radio, if you turn down the bass knob, this is 'cut'.

Boost is the opposite of cut, increasing output level of a certain frequency range.

Both of these terms are in relation to 0 db level. for example, if the signal coming from a CD player is coming in at a level of 80db, then lets say the bass and treble is coming in at 80db. If you let the bass go through your system and out to the speakers at a higher level, say 85db, then you've boosted. Conversely, if the bass is coming out your system speakers at 75db, then you've used 'cut'.

Rolloff is a ratio of EQ cut. The more in a frequency direction you go, the more cut is applied. So if you put a 100hz rolloff, then at 95hz there would be, maybe 1db cut. At 85hz, there would be 3db cut. At 75db there would be 6db cut, and so on, and so on. The EQ curve on the screen would go down, as the frequency goes lower.

Same as a high rolloff: the higher the frequency, the more the signal is cut.

There's also shelf EQ: at a certain frequency, all signal is cut totally. So say a 50hz high pass, or shelf, will only let signal above 50hz pass through. Anything under that will be removed.

Same as lo pass, say at 15khz, anything under can pass, anything over 15khz is removed entirely.

They're all useful in different situations, sometimes to remove rumble, or hum, lots of stuff.

Hope that helps.

Prince CZAR-ming
Since: Apr 08, 2004

Jan 29, 2006 10:36 pm

oop, instead of 0db level, that should have read unity gain. which means 'what comes in the system, goes out the system at the same volume'.

I can't spell.
Since: Nov 10, 2005

Jan 30, 2006 09:37 am

Could this information be put into the reference part of the website? Just an idea.

Since: Mar 05, 2003

Jan 30, 2006 06:30 pm

yeh this is still seeming a little cloudy but ill probly pick it up eventually

Czar of Midi
Since: Apr 04, 2002

Jan 30, 2006 07:28 pm

Roll-off is in the glossary under the Help and Referances section. We will have cut and boost added. There are tons of terms in the glossary for you to browse. So you can take a look then when you arent sure of a term. But most commonly used terms are in there.

Since: Mar 12, 2005

Feb 07, 2006 02:18 am

Def-it-neatly not a stupid questions ! thanks guys, I had the same kind of questions when I read the article on EQ.

It sure helped a lot

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