I found this info doing some research on the net. I want to share it with all you guys. Since all I do is post questions, here is some info sharing. Let me know if they are any good, they have helped me alot! ENJOY!

Kick Drum

Any apparent muddiness can be rolled off around 300Hz. Try a small boost around 5-7kHz to add some high-end .

50-100Hz ~ Adds bottom to the sound
100-250Hz ~ Adds roundness
250-800Hz ~ Muddiness Area
5-8kHz ~ Adds high-endprescence
8-12kHz ~ Adds Hiss

Snare

Try a small boost around 60-120Hz if the sound is a little too wimpy. Try boosting around 6kHz for that 'snappy' sound.

100-250Hz ~ Fills out the sound
6-8kHz ~ Adds prescence

Hi hats or cymbals

Any apparent muddiness can be rolled off around 300Hz. To add some brightness try a small boost around 3kHz.

250-800Hz ~ Muddiness area
1-6kHz ~ Adds presence
6-8kHz ~ Adds clarity
8-12kHz ~ Adds brightness

Bass

Try boosting around 60Hz to add more body. Any apparent muddiness can be rolled off around 300Hz.If more presence is needed, boost around 6kHz.

50-100Hz ~ Adds bottom end
100-250Hz ~ Adds roundness
250-800Hz ~ Muddiness Area
800-1kHz ~ Adds beef to small speakers
1-6kHz ~ Adds presence
6-8kHz ~ Adds high-end presence
8-12kHz ~ Adds hiss

Vocals

This is a difficult one, as it depends on the mic used to record the vocal. However...Apply either cut or boost around 300hz, depending on the mic and song.Apply a very small boost around 6kHz to add some clarity.

100-250Hz ~ Adds 'up-frontness'
250-800Hz ~ Muddiness area
1-6kHz ~ Adds presence
6-8kHz ~ Adds sibilance and clarity
8-12kHz ~ Adds brightness

Piano

Any apparent muddiness can be rolled off around 300Hz. Apply a very small boost around 6kHz to add some clarity.

50-100Hz ~ Adds bottom
100-250Hz ~ Adds roundness
250-1kHz ~ Muddiness area
1-6kHz ~ Adds presence
6-8Khz ~ Adds clarity
8-12kHz ~ Adds hiss

Electric guitars

Again this depends on the mix and the recording. Apply either cut or boost around 300hz, depending on the song and sound. Try boosting around 3kHz to add some edge to the sound, or cut to add some transparency. Try boosting around 6kHz to add presence. Try boosting around 10kHz to add brightness.

100-250Hz ~ Adds body
250-800Hz ~ Muddiness area
1-6Khz ~ Cuts through the mix
6-8kHz ~ Adds clarity
8=12kHz ~ Adds hiss

Acoustic guitar

Any apparent muddiness can be rolled off between 100-300Hz. Apply small amounts of cut around 1-3kHz to push the image higher. Apply small amounts of boost around 5kHz to add some presence.

100-250Hz ~ Adds body
6-8kHz ~ Adds clarity
8-12kHz ~ Adds brightness

Strings

These depend entirely on the mix and the sound used.

50-100Hz ~ Adds bottom end
100-250Hz ~ Adds body
250-800Hz ~ Muddiness area
1-6hHz ~ Sounds crunchy
6-8kHz ~ Adds clarity
8-12kHz ~ Adds brightness

NOW IN GENERAL!

50Hz

1. Increase to add more fullness to lowest frequency instruments like foot, toms, and the bass.
2. Reduce to decrease the "boom" of the bass and will increase overtones and the recognition of bass line in the mix. This is most often used on bass lines in Rap and R&B.
__________

100Hz

Increase to add a harder bass sound to lowest frequency instruments.
Increase to add fullness to guitars, snare.
Increase to add warmth to piano and horns.
Reduce to remove boom on guitars & increase clarity.
__________

200Hz

1. Increase to add fullness to vocals.
2. Increase to add fullness to snare and guitar (harder sound).
3. Reduce to decrease muddiness of vocals or mid-range instruments.
4. Reduce to decrease gong sound of cymbals.
__________

400Hz

1. Increase to add clarity to bass lines especially when speakers are at low volume.
2. Reduce to decrease "cardboard" sound of lower drums (foot and toms).
3. Reduce to decrease ambiance on cymbals.
__________

800Hz

1. Increase for clarity and "punch" of bass.
2. Reduce to remove "cheap" sound of guitars
__________

1.5KHz

1. Increase for "clarity" and "pluck" of bass.
2. Reduce to remove dullness of guitars.
__________

3KHz

1. Increase for more "pluck" of bass.
2. Increase for more attack of electric / acoustic guitar.
3. Increase for more attack on low piano parts.
4. Increase for more clarity / hardness on voice.
5. Reduce to increase breathy, soft sound on background vocals.
6. Reduce to disguise out-of-tune vocals / guitars
__________

5KHz

1. Increase for vocal presence.
2. Increase low frequency drum attack (foot/toms).
3. Increase for more "finger sound" on bass.
4. Increase attack of piano, acoustic guitar and brightness on guitars.
5. Reduce to make background parts more distant.
6. Reduce to soften "thin" guitar.
__________

7KHz

1. Increase to add attack on low frequency drums (more metallic sound).
2. Increase to add attack to percussion instruments.
3. Increase on dull singer.
4. Increase for more "finger sound" on acoustic bass.
5. Reduce to decrease "s" sound on singers.
6. Increase to add sharpness to synthesizers, rock guitars, acoustic guitar and piano.
__________

10KHz

1. Increase to brighten vocals.
2. Increase for "light brightness" in acoustic guitar and piano.
3. Increase for hardness on cymbals.
4. Reduce to decrease "s" sound on singers.
__________

15KHz

1. Increase to brighten vocals (breath sound).
2. Increase to brighten cymbals, string instruments and flutes.
3. Increase to make sampled synthesizer sound more real.

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Low Bass: anything less than 50Hz

This range is often known as the sub bass and is most commonly taken up by the lowest part of the kick drum and bass guitar, although at these frequencies it's almost impossible to determine any pitch. Sub bass is one of the reasons why 12" vinyl became available: low frequencies require wider grooves than high frequencies - without rolling off everything below 50Hz you couldn't fit a full track onto a 7" vinyl record. However we do NOT recommend applying any form of boost around this area without the use of very high quality studio monitors (not home monitors - there is a vast difference between home nearfield and studio farfield monitors costing anywhere between £5,000 and £20,000). Boosting blindly in this area without a valid reference point can and will permanently damage most speakers, even PA systems. You have been warned!

Bass: 50-250Hz

This is the range you're adjusting when applying the bass boost on most home stereos, although most bass signals in modern music tracks lie around the 90-200Hz area with a small boost in the upper ranges to add some presence or clarity.

Muddiness/irritational area: 200-800Hz

The main culprit area for muddy sounding mixes, hence the term 'irritational area'. Most frequencies around here can cause psycho-acoustic problems: if too many sounds in a mix are dominating this area, a track can quickly become annoying, resulting in a rush to finish mixing it as you get bored or irritated by the sound of it.

Mid-range: 800-6kHz

Human hearing is extremely sensitive at these frequencies, and even a minute boost around here will result in a huge change in the sound - almost the same as if you boosted around 10db at any other range. This is because our voices are centred in this area, so it's the frequency range we hear more than any other. Most telephones work at 3kHz, because at this frequency speech is most intelligible. This frequency also covers TV stations, radio, and electric power tools. If you have to apply any boosting in this area, be very cautious, especially on vocals. We're particularly sensitive to how the human voice sounds and its frequency coverage.

High Range: 6-8kHz

This is the range you adjust when applying the treble boost on your home stereo. This area is slightly boosted to make sounds artificially brighter (although this artificial boost is what we now call 'lifelike') when mastering a track before burning it to CD.

Hi-High Range: 8-20kHz

This area is taken up by the higher frequencies of cymbals and hi-hats, but boosting around this range, particularly around 12kHz can make a recording sound more high quality than it actually is, and it's a technique commonly used by the recording industry to fool people into thinking that certain CDs are more hi-fidelity than they'd otherwise sound. However, boosting in this area also requires a lot of care - it can easily pronounce any background hiss, and using too much will result in a mix becoming irritating.