What to do about Sub box


Silver Member
Username: Jaackdeth

United States

Post Number: 823
Registered: Sep-04
Question, I have a fairly large speaker box with the 18" sub pointed up in my SUV, the port for the box is facing the flip up door in back, it is only about 12 inches or less from the door, would putting something like plexiglass on the back door where the port hits the door work for a better sound, I don't have the room to move everything around, as I am using 3 amps, lots of wires. Any suggestions would help. Thanks

Silver Member
Username: Gcs8

Atlanta, Ga

Post Number: 827
Registered: Sep-09
the only thing i can think of is to deaden your back hatch. but that will just take away noise form the back and will make the sub appear louder and help energy transfer. (i reserve the right to be wrong.)

Silver Member
Username: Jaackdeth

United States

Post Number: 824
Registered: Sep-04
anyone else??

Silver Member
Username: Jemone

Tucker, Georgia United States

Post Number: 373
Registered: Jan-06
our vehicles we drive were not designed for all of the torturous spl we here at ecoustics place in them. So you are probably going to have to reinforce your back hatch with the sound deadening material of your choice one of these nice summer weekends when you get time ( x2 deathoob).

Silver Member
Username: Jaackdeth

United States

Post Number: 825
Registered: Sep-04
The thing is I am wondering if I am to close to the back hatch with the vent?

Diamond Member
Username: Wingmanalive

Www.stainles... .ecrater.com

Post Number: 23141
Registered: Jun-06
You stated it was like 12" from the back?

Many will tell you a 3"- 4" minimum on the INSIDE. I would think you're fine with 12" on the outside.

Are you concerned about noise?

Gold Member
Username: Southernrebel

Monroe, Louisiana Team Audible...

Post Number: 8141
Registered: Mar-04
12" from the back hatch is just fine.
Your hatch may rattle to hell and back, but its fine as far as distance.

In fact, in many cases...having your port even closer to the back hatch is better. That will load the port and make the box tune lower than its 'on paper' tuning frequency.

A rule of thumb (that doesn't really work in many cases, but is something to think about...I.E,..take it w/ a grain of salt) is to have the port at least the same distance as the ports width from any structure in the vehicle.

When designing a box, you have to take this vent loading and vehicle transfer function into account. That is why quite a few of the boxes I design 'tune' in the low 40hz range, but still SLAM at 30hz

Post pics and measurements of your box if possible.
If your back hatch rattles really bad and you want to stop it, mat it w/ at least 2 layers.

Silver Member
Username: Jaackdeth

United States

Post Number: 826
Registered: Sep-04
Ok all, thanks for the input!!
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