can someone give my box measurements a once over and tell me if this is going to work,I have 7.49 cu.ft. and i am going to make a box for two fifteen's . I am going to use either the Q's or bl's , the box is going to be ported useing psp flare ports 4"x 17" four of them at this length. is this going to be enough room and are the amount of ports correct to tune this box to 28hz.. this is for a daily driver I listen mostly to rap and R&b. If this doesn't sound right could some one give me some direction, this is my first box build and i want to get it right. any help would be graetly appreciated thanks.

can somsody take a look at this and tell me what they think ,anybody please.

is that 7.49 cubic feet after port and sub displacements or before?

If it's after, your tune is 30 hz.

If it's before any displacements, your tune is about 31.5 hz.

If you want to tune to 28 hz, the port should be 20" if the 7.49 is after displacements, or about 23" if it's before displacements.

7.49cu.ft. is after displacement, would I be able to use a set of bl's as well as q's in this box or should I stick with the q's . thanks for the help.