weird sub issue

[JoiNt- 10+ year member]

not sure if this is the right place to post this but here it goes....

i have two 12" rockford T0s in a ported box

rockford punch 1000.1bd amp

subs are dual 4s wired to 1 ohm

heres the issue, when the subs are in the trunk if the volume is too high they bottom out even with gain at 1/4, boost at 1/2, freq at 40hz, and on the radio subwoofer about 10 outta 15 boost -9

i put them in my backseat with all the windows down same settings.....they dont bottom out with the volume up and sound twice as loud

the box they are in really isnt that big its actually a nice looking box...i know its not bigger then 3.5cu ft total and the subs recommend from rockford is 1.65cu ft each

also when i had them in the trunk with the lid open they pounded without bottoming out, soon as i shut the lid they started doing it, i know its not the car rattleing cuz when it happens....the bass drops and when i turn the volume down one or two bass comes back and rattle stops

sorry for long post any help is great

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[goingdef 10+ year member]

that really don't make much sense since when most people open the trunk and expose the sub to no real pressure limits they bottom out but won't when sealed up due to built up pressure, check you deck lid it's not the sub if they don't do it but only in a sealed trunk, check your dome light crank it until you hear the sound and press up on the light I thought I had blown a sub a while back but when i checked it there was no problems a week later I realized it was the dome light slapping the roof.

 

[JoiNt- 10+ year member]

alright ill do some checking....it is a weird issue that im not sure of.....im pretty sure its them bottoming out, like if i have the volume at 18 no rattleing at all, if i turn it up just one to 19 on the same settings excessive rattleing/popping from the back where the subs are happens