When my trunk is open you can really feel the bass compared when it’sclosed

[Tiltz]

When I open my trunk in my car the bass in the front gets really good abs how I want it but when it’s closed it’s like I can barley feel it but when you put your head in the back above the box it’s good just from the back seat forward it does it. Could it be the box design or placement?

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[YourNameHere 10+ year member]

could be placement/cancellation.....try disconnecting one sub and see how it sounds, I have never had luck with subs firing at each other

 

[Clifff150 10+ year member]

I think you’re having cancellation issues as well due to the subs firing at each other. I could be wrong though

 

[MattinMO]

The subs firing toward each other is a no no with what I am assuming is sealed boxes. Looks good but I'm certain you're having major cancelation. The reason why it sounds better with your hatch open (not sure why you called it a trunk looks like a suv to me) the air that's being trapped in between the subs firing at one another has room to escape

 

[shredder2]

When I open my trunk in my car the bass in the front gets really good abs how I want it but when it’s closed it’s like I can barley feel it but when you put your head in the back above the box it’s good just from the back seat forward it does it. Could it be the box design or placement?

When I installed my first 150db (1995) personal system I had a box that looked somewhat similar.
It was 2 banks of 2 12s firing towards each other.
Different in that the top/bottom center panels extended just past the subs.

Try to extend the top/bottom center panels past the subs to a point within a foot from the gate (at least temporarily) to see if it changes anything.

Hopefully this may fix your issue

 

[Buck 5,000+ posts]

Subs can fire at each other, just as long as they're in phase.

 

[huberoy123 10+ year member]

Space may have been an issue for those large subs, but I would personally have had them firing upward. Like others have said, it looks like they are competing with each other. Just one opinion. Good luck with your solution.

 

[MattinMO]

Subs can fire at each other, just as long as they're in phase.

100% but I think it depends on the overall application and not just being in phase. Almost all the big 4th,5th,6th order builds have subs firing at each other

 

[shredder2]

I'll illustrate what I said above. The 1st pic is basically what you have now without the hard floor as drawn.

I bet as long as the subs are in phase changing it to this will make a marked improvement as long as there's some space to the tailgate.

I'd make sure it has a solid floor and back wall along with changing it to what's shown (or close) if it was me.

Give it a try... its only wood.

 

[Slo_Ride 5,000+ posts]

I see no trunk.

 

[Buck 5,000+ posts]

You should let me design you a box

 

[Buck 5,000+ posts]

I'm not sure why your amp and other equipment is mounted there right next to the woofers. I'd mount it on something other than the box itself. Is that originally a box built for a trunk?

 

[Bobbytwonames 5,000+ posts]

That looks like the back of an SUV to me. Build a new box. Subs up and port back.

 

[hispls 5,000+ posts]

I'll illustrate what I said above. The 1st pic is basically what you have now without the hard floor as drawn.

I bet as long as the subs are in phase changing it to this will make a marked improvement as long as there's some space to the tailgate.

I'd make sure it has a solid floor and back wall along with changing it to what's shown (or close) if it was me.

Give it a try... its only wood.

This was my thought as well, though this will perform like a 4th order so results will be unpredictable. The issue I see is how far forward from the rear hatch the subs are. That's usually a recipe for cancellation and some nulls.

 

[Breaker]

Cancellation. It's not acting like a bp. It's just cancellation. Put the woofers closer to the rear hatch