gnx124 box

dahlanfire55

i am looking for help in designing a sealed enclousure for two gnx 124 subs? i am installing them in a spare tire well with a fiberglass bottom and 3/4" mdf top and sides. i am after sound quality clean and tight bass. also is there a right or wrong way to break in the subs? i've heard to play them at moderate levels for 20 to30 hours. thanks for any info