Porting through rear deck in trunk car

[eboutin88 10+ year member]

I have a 2008 Pontiac G6, if anyone has seen the backs of the seat they are a hard plastic and I believe they prevent alot of bass geting into the cabin of the vehicle. I was looking into porting through the rear deck lid where the 6x9 hole are with a chimney style port. Has anyone done this sort of thing. If so, how much of a difference did it make in spl. I hit 145.9 with 3k watts to Alpine type R's in the car but I want at leas 6-8 more DB. Any feed back would be nice from people who have seen or actually done it.

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[maldecido33 10+ year member]

Six to 8 dB is unrealistic; if you gained anything from porting through the rear deck, you'd be lucky to get 1 or 2 dB, if eveb that much.

 

[rumple4skin 10+ year member]

you wont get 6 db out of it for one, for two i have asked this question a few times to hear what these guys have to say. 95% of them all say that its worthless and will more then likely **** up the tuning you have(unless you are a great with dimensions). from what all of them said you will end up with a ****ed up tuning and are better off not doing it. on the other hand as i said i have asked this question a few times for different reasons, but in every case this was the most thought of outcome.

 

[rumple4skin 10+ year member]

varry lucky to get 2 db out of it

 

[canyouhearmatt 10+ year member]

every 3 db..you double how loud you are..

so by porting through the rear deck..you hope to get almost 3 times louder...

doubt it..

not unless you upgrade electrical..amps ..subs box..you could go up higher..

i.e more cone space...

 

[eboutin88 10+ year member]

I realize I wont get any more than 3 DB out it, I am not stupid, I was just stating that I wanted more than what I was at. 145.9 to me is not impressive. I was saying that I wanted to be at 150 eventually. To be more specific with my plans, I was going to purchase another JBJ W12 Gti MKII which would give me three total subs at 1ohm. I was going to have a box built facing the subs toward the deck lid with the ports firing through them. The guy planning this said he could tune it to 35 hz using a box building software. I am hoping with these subs, instead of the type R's (2) I would get a significant DB increase.

 

[maldecido33 10+ year member]

So you're gonna mix two different type of subs? (2) Type R's and (1) Gti?

 

[canyouhearmatt 10+ year member]

i only said that cuz you said 6-8...wtf...anyway

no...

35hz..naw son..

tune higher...if you want to strictly hit good on the meter..

cars are louder with subs back, port back..passenger side...

i would do 2 strong subs..in a good box..maybe with aero ports..

or..

even better..

do a crx style box with ports going into cab...for real good on the meter..

with of course..decent wattage.

 

[canyouhearmatt 10+ year member]

could you even wire 3 subs @ 1 ohm anyway..good luck..

 

[canyouhearmatt 10+ year member]

yea...you could get 1.33

 

[eboutin88 10+ year member]

Also, I have read online that it essentially turns a trunk vehicle into a psuedo hatch back. If you saw the back of my seats you would see why I think I would get a huge difference. the back of my seats is hard plastic. I can't see how air would travel through them like a foam back seat. That is why I am hoping for a 3 DB gain from that alone plus I was hoping a 2 DB gain with the three GTi's. The doing the work for me said that one JBL Pro in a trunk car similar to mine hit a 146.7 with only 800 watts.

 

[eboutin88 10+ year member]

So you're gonna mix two different type of subs? (2) Type R's and (1) Gti?

No, I will be having three GTi's powered by the MMats D3500.1

 

[eboutin88 10+ year member]

could you even wire 3 subs @ 1 ohm anyway..good luck..

The GTi's are DVC 6 ohm, what do you mean by aero port

 

[canyouhearmatt 10+ year member]

well if your gonna go with it do it right..

take out the rear deck..build the box..make the ports fire into the rear window...

and seal the box off from the rest of the trunk..

 

[canyouhearmatt 10+ year member]

aero ports are the rounded ports..easy to deal with...great for cars/hatches

 

[eboutin88 10+ year member]

i only said that cuz you said 6-8...wtf...anywayno...

35hz..naw son..

tune higher...if you want to strictly hit good on the meter..

cars are louder with subs back, port back..passenger side...

i would do 2 strong subs..in a good box..maybe with aero ports..

or..

even better..

do a crx style box with ports going into cab...for real good on the meter..

with of course..decent wattage.

My goal with my system is to hit hard and sound good, so do you think that I should have it tuned to like 45, I don't want the 60 hz that is mere spl, no SQ

 

[canyouhearmatt 10+ year member]

i like 40hz..

42 should be perfect for a SQL application

 

[eboutin88 10+ year member]

well if your gonna go with it do it right..take out the rear deck..build the box..make the ports fire into the rear window...

and seal the box off from the rest of the trunk..

Our plan was the aero ports, making the ports fire into the rear window through the 6x9 holes or making the port the size of the 6x9 holes kind of like the kicker boxes

 

[eboutin88 10+ year member]

i like 40hz..
42 should be perfect for a SQL application

What kind of music do your listen to though, I listen to rap, rock, heavy metal, once is great while even country. Will that music sound good at 42 hz. The other Q is have you ever heard the GTi sub before.

 

[canyouhearmatt 10+ year member]

no no no no no no no...

cut your rear deck out!

build the box to the top of the rear deck..

and seal it off!!

simple.