there are a few things that might be causing this...

1.make sure your ground wires are hooked up correctly cuz this can cause a humming sound

2.your fones don't have to go very loud in order for them to be heard so they have alot less distortion and overall better sound quality in most cases

3.if you have subs hooked up to your setup you have to be very careful with bass because subs catch a lot lower frequencys then your fones and they basically screw you over and magnify the sound frequencys that you can't hear on your fones the only solution i can think of is watch your EQ on the mixer when your going from cue to live and make sure nothing is playing to strong or get new and better fones thats catch low ass frequencys

hope that helps

Don't quote me on this, but I think that when you are using stereo speakers, there tends to be more distortion and outside noise, which will lessen sound quality. Also, it might be that with headphones as you raise the volume there won't be as much bass distortion like in speakers.

___________________

It has to start somewhere,
It has to start sometime,
What better place then here?
What better time than now?
--Rage Against the Machine

There are a LOT of factors that can affect overall sound output in your speakers. I will try to list a few things here, but unless you record the sound so that we can actually hear it, then I don't know how much help we will be.

First off, you weren't clear on when this sound was occuring. Is it only during the transitions, or does it occur all of the time when you are using your TTs. Hmm, well actually, you didn't even say that you had TTs, so what equipment do you have? You will basically have to get very specific with your setup, what equipment you have, how it is set up, if you run any diagnostics on it, when the sound occurs, did it always occur or did it just start recently, etc, etc.

First thing that I would do check all of your cables. Do you have them connected tightly? Are all the speaker cables connected so that they are polarized with eachother (ie the red outlet on your amp goes to the red inlet on your speakers and the same with white, and NOT red to white etc.) If not, this can affect how the sound comes out of your speakers. Also, how big is your room? Is it small enough that if you have turntables, you are causeing a feedback loop? How loud do you have it turned up?

If all of your cables are okay, and you are sure that you aren't causeing feedback into your system (turn the volume down to a resonable level), then try to isolate further where it is coming from.

Hook up a normal cd player to your mixer and play a cd. Does that sound the same or better. If it does sound better, then it is your CD deck or TT. Also, make sure that you check each output on your mixer and not just one. If there is still a problem, then maybe it is your mixer. Hook up the cd player (or TT if you can) directly to your amp. How about now? If it sounds better, then the problem is your mixer. If it still sounds bad, then it may be your amp or speakers.

If you have more than one pair of speakers or another amp, then try switching them out until you eliminate the problem. If you still have a problem, then it is obviously something that you're overlooking, or your speakers just suck Give me more details!! And for future reference, the more information you give us, the better we can help you right from the start! We don't know anything other than what you tell us, so be very descriptive if you want some real help. If any of this helps, then let us know what it is and if not, then tell us what you have tried and maybe it's time for a sound sample!

___________________
When you dance, the DJ takes you on a journey, but he or she is usually not the focus of your experience at a club or festival or wherever you hear the music. Dancing is. Music is.

could just be an echo problem and how the speakers are set up and shit?

1. Your headphones have a different frequency response. No way a 50 mm coil will sound exactly the same as a bigass speaker. Pure physics.
For example you can have bass cancellation on the speakers, but not in the headphones, just for the reason that your speakers can output that low, while your phones can't. You can't cancel out what you already don't have.
Generally, be more careful with low frequencies on speakers, the bigger the system, the more careful you'll have to be.

Sorry there's no magic in that. You'll just have to learn to make links. You'll have to learn that what sounds that way on your phones will translate to that on the speakers (and that is different on each system).

2. Armins sets are broadcasted. When you do broadcasts the signal always passes some heavy processing gear (to be conform with the broadcast standard of that stationn, etc...). Don't think that what you hear from Armin is the straight output from his mixer. Generally you'll find a graphic equalizer (30 bands or more), maybe an extra parametric one, a compressor, and finally a limiter (the last two steps can be combined into one finalizer). That'll definately change your sound. Unless you have all that gear, you'll be challenged to get the same sound as on those pro broadcast.