Anything above 20kHz is outside the human audible range so what is lost is quite insignificant. I hear though that having frequencies slightly above 20kHz does make the the cymbal like noises sound fuller even though it is outside our audible range It may make a slight difference but it is very small.

This is to the best of my knowledge, maybe someone else has something to say about it.

Well, it's going to make it a 20 to 20 sound intead, and it will degrade quality. The question is, how much will it degrade it ? If you just have a normal setup, I doubt they'll be much of a differance.

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Yah, I wouldn't worry about it too much. Those frequency response figures are usually kinda fudged by companies anyway, and as a sound engineer, I know for a fact that the majority of people can't hear anything at all above 16 KHz anyway. There are still some very unique people who can hear almost up to the 20 KHz mark, but that's rare.

Some will tell you that inaudible frequencies like those above 20 KHz will still add to the ones that are audible and help the overall sound, but to be honest, you would need a wonderful set of ears to really be able to tell the difference.

Heh, don't let those audiophiles scare you away from using that EFX-500!

Plus, if you're a DJ like lots of us, heh, you've probably already ruined your ears already anyway.

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think stasis | latest mix

yeah, agree with what is being said before! you gotta also pay attention to the quality of your speakers and amplifier! what kind of a sound they can produce? if it's just a normal setup i'm guessing those are the weakest links on that! and then you gotta notice that you aren't even going to hear or feel any difference, so it's all good.

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I would say that it makes little difference on a home system but it would in a club.
Basically it's not always about what you can hear but what you can feel.
I know vinyl has a greater range than CDs for example but 20khz is well below both of them.
I read somewhere that the average human has somewhere between 16 to 18khz from their hearing.
The EFX 500 will have the last say on the sound quality.
I am by no means an audiophile but would be able to tell what is what on a big system.
I would say that you should test it yourself and see how you find it. Use it for a week or so and get used to it. Then take it off and see.

Cheers
Nem

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your needles probably have barely any response that high, anyways.

i wouldnt even think about it. 20hz-20khz is all you should worry about.

and if your using PA speakers, they probably dont have much response above about 15k, anyways...