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View Full Version : Building 1st box.. 2 12" XFL's on a Phantom 4000md



Syntaxx7x
05-11-2013, 07:03 PM
I want to go with something that will have the least amount of rattle in my trunk.. I've already put a layer of sound deadener in my trunk and trunk lid.. Now all that rattles is my bumper and roof..

Anyway.. I wanted to go with subs face up and ported into trunk.. or even ported into the cabin if that would be better.. Does sub placement have that much of a impact on rattling.. and what about port placement..??

I already have specs for box.. 4.2 cubic ft @ 33 hertz.. I'ma try to get it as close to that as possible.. I'm going to have to assemble the box in the trunk cause I have a stupidly small opening for my trunk but a good amount of volume in the trunk..

Any tips..?

Like I said this is my 1st box..and I don't want to mess anything up.. and i'm going to use 5/8 particle board for this one.. and once I have one that I like I'll use some Plexi and some LED's...and I'm having to assemble inside the trunk..

oh and i'll be putting it inside a 2010 Camaro..

NASTY08IMPALA
05-11-2013, 07:11 PM
Either subs and port back or subs forward port side ...no subs up in trunk

NASTY08IMPALA
05-11-2013, 07:13 PM
And for the love of.god dont use 5/8" particle board use birch arauco or mdf last resort

Syntaxx7x
05-11-2013, 07:45 PM
i'm just using something cheap to get the right size and port area in my trunk.. I don't want to buy 3/4 mdf for my 1st box and F(_)c|< it up..

---------- Post added at 06:45 PM ---------- Previous post was at 06:44 PM ----------

why not subs facing up??

NASTY08IMPALA
05-11-2013, 07:53 PM
I wouldnt was the money on particle board ...and subs up in a trunk is just not a popular option

Syntaxx7x
05-11-2013, 07:59 PM
oh ok.

Syntaxx7x
05-11-2013, 08:02 PM
so there's no reason really.. just not a popular option

NASTY08IMPALA
05-11-2013, 08:13 PM
so there's no reason really.. just not a popular option

No theres performance reasons as well

Syntaxx7x
05-12-2013, 05:16 PM
Ok so I did some measurnents... I can get 4.94 sq ft each if I go with a 2 ft depth. . The box is going to be trapaziodal shaped.. should I rescale to meet the 4.2 ft or is bigger better?? Is there a drawback if the box is too big.. I think it has something to do with unloading.. would subs forward port side have less trunk vibration than subs back port back??

NASTY08IMPALA
05-12-2013, 05:19 PM
Yes less rattle with port side vs port back ..and if you are going to be underpowering or barely giving subs rms ...u can get away with a bigger box no prob

Syntaxx7x
05-12-2013, 05:45 PM
Ok.. just did some re calculations. . I can do a 1.75 ft depth on box and get it to 8.66 cubic ft.. which comes out to 4.33 per sub.. which is closer to the 4.2 that is recommended. . Will it matter if the port is on the angled side of the box??

---------- Post added at 04:45 PM ---------- Previous post was at 04:44 PM ----------

And just for the record.. thanx for helping me out and answering my questions. .

NASTY08IMPALA
05-12-2013, 05:48 PM
4.2 cubes per sub ?? thats wayyyy too big 4.2 should be the size of the whole box...sonewhere between 4-5cubes total

---------- Post added at 04:48 PM ---------- Previous post was at 04:47 PM ----------

And a angled box and port will probably cause some loading issues

Syntaxx7x
05-12-2013, 06:50 PM
Ohh sh*t.. lol.. aight..

Lowlacs
05-12-2013, 07:02 PM
I run this exact setup in my truck now, 2 xfls on a ph4000 but in a 4th order. U dont have this kind of room tho. Before this box I ran em in 4cubes ported at 32hz on a vfl110 same 2krms and it got real loud. Ive found trunk builds to be a real crap shoot as to whats louder or shakes more, but in general subs and port should be on the same plain either foward or to the rear. I am not a profeesional tho, there may very well be a science to ur maro so just keep askin and someone will chime in with the goods. Good luck on the build and remember its only wood.

Syntaxx7x
05-12-2013, 09:55 PM
Thanx.. im trying.. :)

---------- Post added at 08:55 PM ---------- Previous post was at 08:54 PM ----------

Do u think the vfl is better than the phantom??

dbeez
05-12-2013, 10:02 PM
The vfl line is the best line ab makes.

Lowlacs
05-12-2013, 10:23 PM
Yeah my vfl runs much more efficient, its not near as hungry as the ph and it runs cooler. Also the vfl has the 16v ability for even more power but I dont compete so the 16v was no appeal to me. I just traded for a pair of the ph amps and Im happy with them so far. The sub amp is a bit hungry but makes the same power to my ear, the ph4100 highs amp isnt as clean as my mmats 2050x but I suppose thats not a "fair" comparison.lol

I may consider selling the vfl110 if ur intrested.

Syntaxx7x
05-13-2013, 08:14 PM
Ok.. got some new dimension... is 1.125 ft too shallow for a box.. ?

Lowlacs
05-13-2013, 08:31 PM
"shallow"? Sub specs usually list a surface mount depth, and long as you have plenty of clearance around and below the motor u should be fine. If u were asking, 1.125cubes isnt really enough per sub. I found my xfl 12s want 2 to 3cubes apiece to be happy.

Syntaxx7x
05-13-2013, 09:00 PM
No thats just the depth of the box.. the box is 4.6683.. thats before sub displacement. .

Lowlacs
05-13-2013, 09:07 PM
Thats perfect for them, I ran my pair with 4cubes in my dakota ext cab and they were really loud. U've got it man, get to building!

Syntaxx7x
05-14-2013, 09:00 PM
Ok.. in haven't accounted for sub displacement which is only .2

Also I havent figured out my port length or displacement. .
I have 2 general depth sizes that I can work with...

1.5 ft of depth will give me 6.22 ft^3
1.25 ft of depth will give me 5.187 ft^3
Which would be closer to the volume that I want so that I would have enough volume after displacement..

NASTY08IMPALA
05-14-2013, 11:21 PM
Ok.. in haven't accounted for sub displacement which is only .2

Also I havent figured out my port length or displacement. .
I have 2 general depth sizes that I can work with...

1.5 ft of depth will give me 6.22 ft^3
1.25 ft of depth will give me 5.187 ft^3
Which would be closer to the volume that I want so that I would have enough volume after displacement..

6.22 after sub n port u will be around 5 cubes which will work

Syntaxx7x
05-16-2013, 07:41 AM
here is the pic..
I went to 12volt.. and did the port calculator.. it said 16.806 length..
but i don't know if i have to include the 3/4 of mdf for tghe port size..
Let me know