calibration

ok guys ive been reading for a while about calabarating speakers. I have the access to a calabration disc, and understand to calabrate to 75 dbs. My question is how in regards to getting all speakers to read 75db. I know about the spl meter. Im confused about if one is speaker is over/under 75db, where do i change the volume? Do i change the db reading for the indivdual speaker up or down? Theoretically, if i set all 6 speakers to the same db level on the reciever shouldnt they read the same on the spl meter, takin into consideration that the speakers are of all the same make? Also, my reciever allows me to change the khz for the treble and mids and the hz for the bass on all 6 speakers...is there a standard for the these settings or is that based on indivdual listening?
By the way.... this is just my second post and ive been reading up here for a little while,im new to the home theater "disease" and just completed my first system. Id like to thank everyone who takes there time to post, you have helped me enormously.Id be lost without u.
Heres my first shot at a system:
Sony 43" RPTV
Sony de1075 receiver
Sony 360 dvd player (yes i had problems with this unit too}
Sony sacd 5 disc carosel cd player
Sony psII
Shaw digital cablebox
Panasonic hifi vhs
Speakers: All Energy
xl 26 fronts
ac 300 front center
xl c2 rear center
take 2.2 rear surrounds
xl s12x sub

 

i also forgot to ask about my sound level. my receiver reads from -110db to -20db is as far as ive turned it up. Whats with the negitive? how do i read my sound level if it shows negitive dbs?:b

 

Wow, i cant thank you enough for your help. I really appreciate the time you took to answer this thread. Everything is totally clear . Thanks again