hmmm i don't have very technical answers for you... but here goes. anyone, feel free to correct me
how does the movement of the cone make sound?
the movement causes fluctuations in the surrounding air... and that in turn, is what "makes" the sound you hear. as far i understand it, it's sorta like dropping a pebble into water, the surrounding airwaves all push against each other and the fluctuations travel through the air, to your ears and brain, which processes what you hear.
how does a tweeter make sound compared to a subwoofer?
i'm really not quite sure what you mean by this... but tweeters are generally smaller, and are designed to play the higher frequencies within the audible range (20hz - 20000hz). whereas subwoofers play the lower (bass) frequencies, and the mid's, play everything in between. no single driver can accurately reproduce all sounds in the audible spectrum, which is why each tweeter, mid, and sub are designed to play their respective frequencies as accurately as possible.
what does ohms have to do with speakers i don't quite understand that
ohms refers to the electrical resistance that the speaker has..... i'm not too sure about home audio and such, but for car audio, subwoofers and speakers have a certain resistance in the power that they draw from the amplifier. the higher the ohm rating, the less power you will get out of the amp. of course, there is a limit, because amps are designed to run at certain loads, and you try to run a 1ohm load on an amp designed to only handle 8ohms, it probably won't run that long, and eventually fry out. the way the speaker is wired, determines the resistance (ohms) that it draws from the amp.
what is hertz and frequency is it just pitch or something?
hertz is the SI (standard) unit for frequency. frequency refers to the number of cycles of the wave per a second. the unit hertz = cycles/second. which is just the inverse of the period, which is seconds/cycle.
what does the sound pressure level mean?
SPL is basically a reference to how loud a particular audio system can get. usually rated in dB (decibels), the actual formula for measuring SL is a logarithmic function, meaning that an increase of 10dB from say 100 to 110 is a doubling in sound intensity (not a 10% increase).