EQ Issue?

I don't know if this is only my 5K's problem or is a bug because i havent found any topic regarding the PEQ 4 Band equalizer.So that is my problem : i want to cut off a frequency (for example 400hz ) I set the Q parameter around 90 (so the bell becomes narrower) when i decrease the gain around at -18db the frequency raises as if i'm increasing it! does it is only my problem?Can somebody try it please? THX
(the same EQ on the renaissance works perfectly)

if yr using the low cut parametric and set a narrow q it creates a boost above the frequency you set. .. lots of vst parametric eqs d the same.. You can notice the same effect just using the filter sections when you change the pole type.. changing the pole type is like narraowing the q or sharpening the fliter slope.. but I will try to replicate tonite!

Thx for the answer but it happens with all Q Mid, treble ecc and as i said before, the same equalizer on the renaissance doesn't get this problem

long answer:

I replicated your scenario and found that I get the same result, that the freq I try to reduce in reality gets louder. I happen to know that whenever you talk about an audio signal you are essentially talking about a signal with energies in different frequencies, i.e. if your synth has a LOT of bass and sounds a little crispy that means there is a lot of energy in the low-end and a little energy in the high-end. So what happens when you reduce a band of freqs with your EQ is that you are taking away energy from a part of the sound spectrum, but a result of that its adjacent freqs will receive a slight boost in their energies. This happens for reasons I'm not fully aware of, but I recall reading somewhere that as freqs share their energies in one signal it means that a reduction in one part gives more "room" for other freqs. That's the simplest way I can explain it

Now in your case you say that you set your Q-parameter around 90 at 400Hz. You might already know that a higher Q-value means a narrower band of reduction or gain around that freq, but 90 is a craaazy high value (most EQs don't go over a 24) . With the q-value at 100 @ 400Hz means you are reducing the freqs between 398-402Hz... you follow? This means that its adjacent freqs are almost the same as the one you are trying to reduce. So unless you hit the exact freq of what you want to reduce, you might actually boost it.

First time I've experienced it so I can't say I'm totally sure, but this seems to be the logic answer.

short answer:

Aint no thing tho! Just stick to something around Q 24 if you want to have a sharp band to work with, and it should be ok. It's just weird from Akai's part to add that feature, it's not so much a problem but definately overkill.

Thx for your answer wellfunk, cut 400hz with 90 Q was just an example for underline the problem,i've tried to use vary EQ(with the same settings) over the same sample and only with the 5K this problem shows, now you will say that equalizers are different so i tried the renaissance's PEQ-4Band equalizer( is taken from the 5K and is exactly the same)with the same settings 400hz Q 90 and -18db (for example) and worked properly without any trouble. I've also analyzed the signal spectrum and i've seen with my eyes that the 5K raises the frequency instead of cut.So i'm just curious to know what you think.another bug? why didn't happen with the renaissance?

P.S The 5K reduces the frequency until - 1DB , passed this threshold it starts to raise

yea I think this is some kind of bug. No EQ should be boosting freqs like this, it should just cut the specified freq out. However I would only see it as just that, a bug, it's not a problem when you can work with it on a less extreme setting. Also the MPC isn't the right tool if you need to do some fine adjustments with your samples, that's when a DAW with the right plugins comes in handy.

well, when i'll work with only the 5k i'll use filtering and resample