how to gain more numbers

[djphatbone 1]

my customer have 2 FI BL 15 on a 2.8 cubes each box tune @ 41hz using 2 4inch round port. each enclosure. we did a 148.4db on TL.the car was a toyota rav4.

sub up port rear position. any idea how to gain it's db? i'll post pictures later.

[5.4SPL 0]

my customer have 2 FI BL 15 on a 2.8 cubes each box tune @ 41hz using 2 4inch round port. each enclosure. we did a 148.4db on TL.the car was a toyota rav4.

sub up port rear position. any idea how to gain it's db? i'll post pictures later.

2.8^ ported is a little small for BL 15?

[djphatbone 1]

my customer have 2 FI BL 15 on a 2.8 cubes each box tune @ 41hz using 2 4inch round port. each enclosure. we did a 148.4db on TL.the car was a toyota rav4.

sub up port rear position. any idea how to gain it's db? i'll post pictures later.

2.8^ ported is a little small for BL 15?

yup it's small, but it's louder than it's previous 4cubic box. oh forgot to mention these subwoofer are powered by 2 saz 1500d strapped. any suggestions sir?

[5.4SPL 0]

Seems like port up would be louder to the ear, atleast that's what I've seen.

[johnecon2001 82]

Could try rounding the port too. No sharp edges. 45 degree's might help.