Inaudibile frequencies is it a good pratice to remove them??

[SMOOTH87]

Talking with one of friend he was telling me to remove negative freqencies below 20hz from my track. The weird thing that happened when I did this was that the signal actuall raised. I was told that this happend because the negative freqencies hold down a lot of sounds. Does anyone else know about these frequencies or if they should or shoudn't be removed??

[ December 29, 2003, 10:21 PM: Message edited by: SMOOTH87 ]

[GrantB]

I haven't heard the term "negative frequencies" before. Technically, it's not possible to have a negative frequency, or one below 0 Hz.

When you combine two signals of the same frequency which are out of phase, they will cancel each other out. This is probably not why you heard an increase in level though.

If you heard an increase in overall level after cutting below 20Hz, it was probably that your playback chain (mixer, amp, speakers) was struggling to reproduce these subsonic lows, wasting much of its power in the process. If you have subsonic sounds which are turned up in the mix so that you can hear the higher harmonics of those sounds, you will waste much of the systems capacity on sounds you can't hear.

Frequencies below 20 Hz are considered outside the range of human hearing and not generally usable for music. Also there is little point in having them if you are putting it on wax, because they will be removed in that process anyway.

[SMOOTH87]

My bad I meant inaudible frequencies below 20hz and above 20khz.

As far as the raise I saw was in the wave form from cool edit and sound forge. If you have one of these editors and a paragrahic eq or parmetric eq try this by taking out 20 hz and see what happens to the wave form. I thought something was worng...

[ December 29, 2003, 10:18 PM: Message edited by: SMOOTH87 ]

[Brian]

you must have an autogain compressor of some sort in your signal chain if that is happening

[GrantB]

Yeah that's a different story all together.

Is there a make-up gain setting that is adding level when you apply the eq process?

Can you hear it as well as see it? Sometimes those waveform displays can be misleading.

I'm familiar with both of those programs but I'm on a Mac now so I can't try it.

[Kenny Carvajal]

Originally posted by SMOOTH87:
Talking with one of friend he was telling me to remove negative freqencies below 20hz from my track. The weird thing that happened when I did this was that the signal actuall raised. I was told that this happend because the negative freqencies hold down a lot of sounds. Does anyone else know about these frequencies or if they should or shoudn't be removed?? Sean,

in Sound Forge, there is a makeup gain setting that you can adjust to compensate for the loss of level which is lost during the cutting of the frequency. It's on the right hand side next to the "OK, Cancel, Save etc." buttons. You must have it set to 80% or something.

In regards to removing those frequencies, as mentioned above, frequencies below 20Hz are inaudible. I was given a good tip to cut things below 50Hz or even 60Hz which works for me, though not a full cut. Really depends on the bass. I've noticed that cutting those frequencies keeps the bass area from getting out of control.

Oh and I got those things you asked for for you. Let's try to hook up again man!

Kenny

[ December 30, 2003, 12:14 AM: Message edited by: Kenny Carvajal ]

[O'love]

i always roll off from around 50Hz downwards.... lesson: check your mixes on computer speakers.. most decent monitors dont have trouble with these inaudible frequencies because they filter them out, but when listening over crappy speakers you instantly hear them crap out over these low frequencties trying to reproduce them.....if you loose these frequencies your amp etc. has much more power available.....

Olaf

[SMOOTH87]

Originally posted by GrantB:
Yeah that's a different story all together.

Is there a make-up gain setting that is adding level when you apply the eq process?

Can you hear it as well as see it? Sometimes those waveform displays can be misleading.

I'm familiar with both of those programs but I'm on a Mac now so I can't try it. I tried this on another parametric eq and I got the same effect. The sound does not dramatically change but the signal does raise. If you have a eq like this on the mac you may get the same result. I also do make sure that the gain was set to zero. I know it sound weird but this has happened and not on the same program and with a different plug-in also..

[SMOOTH87]

Originally posted by Kenny Carvajal:
</font><blockquote>quote:</font><hr />Originally posted by SMOOTH87:
Talking with one of friend he was telling me to remove negative freqencies below 20hz from my track. The weird thing that happened when I did this was that the signal actuall raised. I was told that this happend because the negative freqencies hold down a lot of sounds. Does anyone else know about these frequencies or if they should or shoudn't be removed?? Sean,

in Sound Forge, there is a makeup gain setting that you can adjust to compensate for the loss of level which is lost during the cutting of the frequency. It's on the right hand side next to the "OK, Cancel, Save etc." buttons. You must have it set to 80% or something.

In regards to removing those frequencies, as mentioned above, frequencies below 20Hz are inaudible. I was given a good tip to cut things below 50Hz or even 60Hz which works for me, though not a full cut. Really depends on the bass. I've noticed that cutting those frequencies keeps the bass area from getting out of control.

Oh and I got those things you asked for for you. Let's try to hook up again man!

Kenny </font>[/QUOTE]I tried this today by cutting some bass out around 50 & 60 hz. I focused on getting the bass line to be heard more clearly with the bass drum. It does work. I used the paragraphic eq in sound forge. Wanted to ask if you do this with this eq or a graphic eq..

[Kenny Carvajal]

Originally posted by SMOOTH87:
</font><blockquote>quote:</font><hr />Originally posted by Kenny Carvajal:
</font><blockquote>quote:</font><hr />Originally posted by SMOOTH87:
Talking with one of friend he was telling me to remove negative freqencies below 20hz from my track. The weird thing that happened when I did this was that the signal actuall raised. I was told that this happend because the negative freqencies hold down a lot of sounds. Does anyone else know about these frequencies or if they should or shoudn't be removed?? Sean,

in Sound Forge, there is a makeup gain setting that you can adjust to compensate for the loss of level which is lost during the cutting of the frequency. It's on the right hand side next to the "OK, Cancel, Save etc." buttons. You must have it set to 80% or something.

In regards to removing those frequencies, as mentioned above, frequencies below 20Hz are inaudible. I was given a good tip to cut things below 50Hz or even 60Hz which works for me, though not a full cut. Really depends on the bass. I've noticed that cutting those frequencies keeps the bass area from getting out of control.

Oh and I got those things you asked for for you. Let's try to hook up again man!

Kenny </font>[/QUOTE]I tried this today by cutting some bass out around 50 & 60 hz. I focused on getting the bass line to be heard more clearly with the bass drum. It does work. I used the paragraphic eq in sound forge. Wanted to ask if you do this with this eq or a graphic eq.. </font>[/QUOTE]Sean,

I run my eq on an external graphic EQ but each band is pretty narrow. Want to get a parametric for more detail EQing.

But like I said, don't fully cut it, just kind of slant it off a little to still sound fuller without booming. I would only use frequencies lower than 50hz if I'm using a live bass guitar.

Hit me up!

Kenny

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