that doesn't matter..

but you must master the tune that its highs and lows are as loud as in "any" other tune..

You shouldn't look at the Winamp EQ as a reference Eq (!)

The EQ in Winamp has more a personal function, just like an EQ in a hifi system. It's usually used to either correct deficiencies in your speaker system (like if you have speakers that lack high's, you're gonna boost the high frequencies), or to get the pleasant sound you're after (some people like more bass than others, etc).

For producing, you'll normally use reference monitors that sound as flat as possible (so they should represent all the frequencies the same amount, and that without any eq'ing). Usually in studio's, corrective EQ'ing for the speaker system is avoided at all costs (a filter rotates phase, that's not what we want). If a certain (usually flat) sound is looked for, a studio engineer will look at room accoustics first, eq'ing will usually only be looked at as a last resort.

So, the EQ in Winamp should be treated like, say your hifi system. Set it up that way like you listen normally to music. When you need to check a tune you produced (avoid compressed formats as much as you can), don't change anything. The reason you are listening to your tune in Winamp, is probably to check how your mix compares to other tunes you listen in that prog. If you change that reference by altering the EQ, you'll have no reference at all, so it will be useless. But never decide on mastering/eq'ing/compression matters based solely on the response you hear from a "consumer" system. Usually, you'll make your mix on reference monitors, and then try to play it on as much other systems as you can, to see how it translates. Eventually, it's always a compromise. You can't make something sound super on every system. But what you want to avoid is, that it sounds good on 8 systems, but totally crap on 2. Make it sound well on all 10.

You see that you'll have to know eventually how your reference monitors sound. That's the key to great mixes/mastering. If you know how your sound will translate to other people's systems, based on what you hear from your own monitors, you're a big step ahead.
In fact this counts for any system. Theoretically, you could do great mixes on crappy PC speakers also, as long as you know their flaws. But don't change your reference every 5 minutes, as that's the perfect cause of catastrophe's.

thy awesome post, tnx

i don't have any monitors. so it's hard for me...

i was really more concerend about the fact, lets say a base or kick sounds good here, coz maybe of my winamp. and others mite say it's weak coz they maybe don't have there low bit boosted.

No, the most important is to get one solid reference first. A reference you are familiar with. A reference you know the reaction of. So you can tell how it will pretty much sound on other systems. Listen to as much tunes (and again I repeat, avoid compressed formats like mp3 as much as you can for that) on that system and you'll have a pretty good idea how it will tell you what's good or wrong with your mix.