What is the better enclosure for my 12W3?

Hi  I have  two JL audio 12W3, and I have a Grand prix 94.

I want to know what is the better enclosure considering the subs and the trunk of my car.

Thanks

I myself prefer the sealed enclosure for any type of subwoofer system because of it's smooth bass response and the ease of building. If you want SQ with ease of construction, go for the sealed but if you want SPL go for a ported ( square port is recommended ).

I too personally like to use a sealed box for subs,but the JL's work well in either type.Although the subs will last longer in my opinion in a sealed box and will handle & require a bit more power than ported,ported will sound louder at the same volume level compared with the sealed box design.I myself have been using the same (3) 10W6's since 1995 in a ported box for the added higher SPL with no problems and with a great low frequency reponse.

First off use a box with seperate chambers for each sub with the following air space for each sub:

(A)For a good all-around box use 1.25 FT3 sealed,1.75 FT3 ported with a port of approx. 4"W x 15.375"L

(B)For a high dB box use 1FT3 sealed,1.5FT3 ported with a port of approx. 4"W x 16.5"L

(C)For a normal or typical box use 1.5FT3 sealed,2.75FT3 ported with a port of approx. 4"W x 12.625"L

*** NOTE: All of the above specs already take into account for the the basket displacement & for the port displacement using a round not a square port.Also note if you use a ported box you will not be able to use the sub in a sealed box afterwards,but you can use the sub in a ported box after it has been used in a sealed box.The reason being that the ported box loosens up the suspention,where as a sealed box keeps the suspention tight. ***

Hope this helps you out Jorge and gives you some ideas to play around with,I personally would use either (A) or (B) above for the best results.

thaks jeff for your advices..

Thanks static revenger for your advices.

I would like to know if the ported box contains something into, like a fibber glass or something like that, to play better sound.?

No problem Jorge.

Adding some poly-fill is not usually neccesary but does help in some cases but not all,and as Nyxbass had stated adding it will calm the standing waves but the diference is in most cases is inaudible.