PDA

View Full Version : Is this at all common?



CCooney
03-28-2014, 05:52 PM
I'm running 2 SWS-12D4's with a Pioneer T5200 (bridged) in a sealed box in my 2012 Mustang. These subs hit pretty hard, but I've noticed that if I roll down the windows, or pop the trunk with the system on, these puppies THUMP!! Is this normal? I have the whole rear deck and trunk covered in Hushmat, which has nearly eliminated any rattles. Any thoughts?

Popwarhomie
03-28-2014, 06:19 PM
Throw them in a ported box and fire them forward with the trunk sealed up.

CCooney
03-28-2014, 06:23 PM
I would port them, but I don't listen to rap and I'm pretty much out of room in the trunk for a bigger box. They are already forward facing.

NASTY08IMPALA
03-28-2014, 06:26 PM
I would port them, but I don't listen to rap and I'm pretty much out of room in the trunk for a bigger box. They are already forward facing.

Then turn them around

NASTY08IMPALA
03-28-2014, 06:26 PM
I would port them, but I don't listen to rap and I'm pretty much out of room in the trunk for a bigger box. They are already forward facing.

Then turn them around

CCooney
03-28-2014, 06:45 PM
I'll try that

Dmac1991
03-28-2014, 07:24 PM
I believe I read somewhere that lowering your windows, lowers the fs of your subs and allows air to travel alot more freely, which in turn makes your system seem "louder"

CCooney
03-28-2014, 07:35 PM
Doesn't necessarily seem louder, just a definitely harder thump. It's too bad I can't keep the trunk cracked open a little haha

NASTY08IMPALA
03-28-2014, 07:43 PM
Doesn't necessarily seem louder, just a definitely harder thump. It's too bad I can't keep the trunk cracked open a little haha

Its called cancellation.i bet turning it around will help alot

CCooney
03-28-2014, 07:51 PM
Gonna try it right now.

T3mpest
03-29-2014, 10:20 AM
The window going down is just a weird bandpass effect with the cabin. Seems to happen in just about every vehicle. Door open gains even more in most cases. The pressure is almost always on the opposite side of the car, so if you roll down your passenger window or open that door, the drivers side is what gets louder.

bbeljefe
03-29-2014, 10:54 AM
Lowering the windows improves low end response and it happens in all vehicles with any sub arrangement. The reason why is that bass notes are very long (the lower the longer). With the cabin sealed up the reflection causes a faster decay/deformation of the wave form, which causes them to change frequency and thus sound different to us. By opening the cabin up you allow lower bass notes to travel past your ears without as much change in their shape, which makes them sound more like they sounded before they started bouncing off things.