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just to clarify:
0 to 35 hz = sub bass territory. in reality most soundsystems even with subs roll off sharply after 20 to 30 hz with the very best ones rolling off in the 20s. you should not have much presence below 20 hz. cut it off if the graph is peaking high around this frequency range - its just eating headroom.
35 to 150 hz = bass territory. most kick drums sit between 50 and 120 hz. the kick normally has a click or a slap kind of sound right at the start caused by the rapid pitch drop. this sound resides usually in the lower and upper mids. but most of the bass part of the kick is between 50 and 120 hz. in most pro tracks, this frequency range usually peaks the highest, as near dammit to 0 dB as you can get seeing as the kick and bass is usually the driving force behind most club tunes.
150 to 3,000 hz = lower mid range territory. this is where most speech is intelligible. most vocals fit in around here as well as most of the 'telephone' quality of leads and such. in a pro tune it usually peaks in the bass frequency range and then goes flat all the way to 20,000 hz then drops off sharply.
3,000 to 8,000 hz = upper mid range territory. this is where most of the lead instruments sit as well as the definition of vocals. also, the klang part of the open hat and ride sit around here.
10,000 hz + = treble territory. this is all high frequency sound and sibilance. this is usually all hihats, the sparkle on your leads, and the air on vocals.
in a tune you basically want it loud and you want your song to have a good balance of every audible frequency. think of that spectrum analyser window as a box. the idea is to fill that box with frequencies. but you want to fill it in a way where MOST OF THE SEPARATE INSTRUMENTS IN YOUR TRACK DO *NOT* OVERLAP. note that you can fill this box easily by sloppily stacking up layer upon layer of sound.
what i will do when i run a kick drum on its own is to see what it looks like on a spectrum analyzer. a well EQed, well produced kick should be very low on the y axis on 0 to 20 hz, start to pick up sharply at 40 hz. it should peak close to 0 dB between 55 and 100 hz, it should then tail off after 200hz and maybe extend to about 2,000 to 6,000hz where the click/slap is) then drop off sharply after that. the cleanest bass drum you could have would be like an 808 kick. practically all bass and sub that tails off VERY sharply after 500 hz with only a tiny click around 600 to 2,000 hz.
similarly, with your hihats, NONE of them should be peaking anywhere near bass frequency territory or even lower mids really. they should be 0 all the way up until at least 1,500 hz then start to pick up. it should peak around 10,000 to 16,000hz and extend to 20,000 hz for some extra air. then it should drop off sharply since most audio systems arent sensitive enough to pick up sound beyond this value (additionally 16 bit 44,100 hz cds have a maximum frequency range of 22,050 hz. therefore anything really beyond that is just wasting headroom).
when most pro tunes are all in: kicks, hats, leads, pads, bass. they tend to start very low around 0 to 20 hz, pick up sharply after 35 hz, peak on around 55 to 120 hz trail off ever so slightly after that, and then run pretty much flat and fairly close to 0 dB all the way to 20,000 hz. then it should drop off sharply after that.
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