gettin uneven output

[bobo244 10+ year member]

i have 3 12w6v2's in a sealed box around 4.5-5 cubes (its fiberglass so I cant really measure it exact). I put the parameters in winisd and its shows a pretty flat line. they are getting around 500wrms each.

I set the gains and started playing some music and notice that the bass is really quiet and then would just explode on certain notes. I put in a test tone cd and realized that around 40-45 hz it has a ridiculus peak.

Is this the only thing I can do is to play with my EQ in my head unit (pioneer p6500dvd) and set it lower at 40hz?

Its a fiberglass box and im wondering that maybe I didnt seal the box up goodenough or something?? Any thoughts?

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[bushtree 10+ year member]

Only things i could think of are

1) Check your amp/headunit settings you may have 40-50hz boosted or something..

2) Box size may be too big or to small causing area's to peak..

In which case either try adding polyfil or adding mdf inside to take up airspace..