Help with my friends wall

[DylanBunch]

My friend has 4 skar zvx 15s on a dc 5k at .5 and he had it metered (but on a skar 4500 at .5) with passenger side sealed, driver door open and did a 150.0 at 41. His wall is 15cbft at 35hz with 200" of port. Now it's his daily car so it's made to be musical but he does care a little about the score and I feel like it should be higher, other than electrical upgrades (right now a singer 290, d3400 and d7500) what are some things to help get his score up to a 51 or 52? I feel like maybe the box just isn't efficient?

[mrd6]

First off its possible they didn't meter right and he actually peaks at a different frequency but with those box specs 40 ish does sound about right.

But either way, with that equipment and to barely break a 150 outlaw something is wrong.

There are a ton of possibilities but my guess is just that it is a shitty box. Assuming voltage drop isn't scary bad right now, more electrical isn't the answer...

[mrd6]

Pics of build?

[DylanBunch]

Well when he had it metered he dropped bad because he got the d7500 after but I guess the box needs to be braced. The sides top and bottom are double layer 3/4 mdf, the back is 2x4s and the front is a triple baffle. I don't have any pics of it

[DylanBunch]

It's also fiberglass end inside though not extensively

[tacomaguy1]

Meter can be a heart breaker sometimes