Question about Sony XS-L1200B Car Subwoofer

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Enclosure type I'm wanting to build a new enclosure for my subs, I have 2, and I was wondering if sealed or ported/vented would give me the best sound, Im looking for more low frequency sustained instead of just pounding bass.

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Re: Enclosure type

Sealed box and somewhat large if they are 12's I usually try to get 3 cubic feet overall internal dimensions and generally the inside dimensions will be 13" tall 32" wide and 13"-14" inches deep. with no divider and make sure the box is sealed. Personally I like to phase the speakers backwards. Gives the bass a little more rumble.

Posted on Jan 05, 2007

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12 inch sub(JBL) in box with a 500 watt pioneer amp, sounds good with some types of base. would you cut a port hole in speaker box?

riverray1969 it would help if I knew the exact model number of that JBL sub you are referring to. With that info I can provide exact specs.

Basically, you need to build/modify an sub enclosure that is suited for the sub, the music you mainly play, and vehicle tuning. Generally, sealed enclosures will provide tighter bass response and get decently loud. Some would argue that it will give you greater sound quality. A ported enclosure will give you a louder more booming sound. That depends also on where the port is tuned (ex. 32 hz, 36 hz, etc ). You need to make sure that the enclosure meets the sub's airspace requirement as well. A customized well made enclosure is just as important as the sub you put in it.

Oct 16, 2012 | JBL P-1020D Car Subwoofer

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What r the parametric specs for the ma audio hk15x2

Fo (Hz) : 29.581 QMS : 3.965 QES : .517 QTS : .457
VAS (liters) : 147.723 REVC (Parallel-Ohms) 1 SPL @ 1 watt/ 1 meter (dB) : 90.6 X-Max Linear peak-peak (mm) 70 LEVC @ 1kHz (mH) : 1.043 Enclosure Volume (Sealed) : minimum 2 cubic feet Fill Required % : 0 3dB down point (-3dB) : 43 maximum sealed: 2.5 cubic feet n fill required: 39 at 3 dB down point Enclosure Volume Ported Vented (cubic feet) : 5.0 Vented to Hz: 35 3dB down point (-3dB Hz) : 28 Square port area Sq/In : 80 Port Length : 13" Power Handling : 2000 Watt RMS & 4000 Watt Max. Make sure to use MDF for the enclosure and use 1 inch thickness and use braces as well. This is a beast of a sub woofer. So give it the proper power it needs and make sure that your box is very solid in construction. If installed correctly and given the right power, this sub woofer is bound to put a smile on your face and rattle your bones. I hit 142dB with only one of these subs and im sure if i gave it more power i could hit the 150dB range. DON'T FORGET TO GIVE IT THE POWER IT DESERVES. Have fun dreamsystems.

Feb 16, 2011 | MA Audio HK15X2 Car Subwoofer

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What size should i make the enlcloser

If looking for LOUD, ported enclosure is the way to go.

If looking for accuracy, build sealed. You will need approx 2 cu ft
To tune this 2 cuft box around 50Hz, you need (1) 4" round port 5" long.

MTX recommends an enclosure of 2cuFt ea. You will only be able to use 1 subwoofer in this application.

Even a sealed enclosure is recommended 1.25cuFt.

You can shove 2 in the vented enclosure, but you may not be happy with the outcome

Dec 02, 2010 | Jensen XS-1010 Car Subwoofer

1 Answer

Hi i have a 15"w3-d4 jl audio sub,can anyone tell me what size antype box i should use ie sealed or ported and the box dimensions

I've had a look at the JLaudio website and they recommend 2 box designs, a ported and a sealed.
The sealed box needs a volume of:
2.125 ft3 or 60.2 litres.
To get this you would need to build the box to these dimensions:
22" x 16" x 14.75" or 559mm x 406mm x 375mm
The ported box needs a volume of:
3.50 ft3 or 99.1 litres.
To get this you would need to build the box to these dimensions:
24" x 19" x 18" or 610mm x 483mm x 457mm.
The port needs to be:
3.0" x 10.9" or 76mm x 277mm.
The enclosure recommendations listed above are external dimensions which assume the use of 3/4" (19mm) thick material. If you are using 5/8" (16mm) thick material, subtract 1/4" (6.5mm) from each dimension. Do not use any material with a thickness of less than 5/8" (16mm) as this may compromise the rigidity of the enclosure.
• All enclosure volumes listed above are net internal volumes! Driver displacement, port displacement and brace displacement must be added to obtain the final gross internal volume. All enclosure dimensions above have already taken this into acount.
• When using two subwoofers in a common enclosure simply double the required volume and, in the case of a ported enclosure, use two times the recommended port(s). Likewise, when using three subwoofers in a common enclosure simply triple the required volume and, in the case of a ported enclosure, use three times the recommended port(s).
• We recommend the use of this speaker in a bi-amplified system using high-quality satellite speakers and a high-quality amplifier. We do not recommend the use of this subwoofer with a passive crossover (coil), as this type of device will adversely affect performance.
As you can see it all depends on the space you have available, whilst the vented box will give you a more efficient bass responce especially with the low range frequencies.

If you to go and look at the information about your sub woofer and find out all the information about building or buying the correct enclosure then this is the link to the pdf file I found:
The enclosure info is on page 3:
JL AUDIO 15W3 Tech Specs and box info.
Warm regards

Oct 12, 2010 | Jl Audio 15W3-D4 Car Subwoofer

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Should I use a vented box or a non vented box for my ALpha PSW412

Well, First you need to figure out a few things. How much room you have is one main consideration, If you go with a vented (ported) enclosure or band pass (see below) than you will need more room than with a seal enclosure, If you really have no room you can mount them " Free Air" which is mounted on a board and fired into the back seats, the Truck acts as the enclosure.
Now the type of bass you want is another consideration. The best enclosure for maximum bass is a bandpass box. It is 2 subs facing each other with one side fully enclosed and the other side ported. This is best for deep powerful bass but the enclosure can be rather large. Vented boxes are second best (In my opinion) they give you deeper bass and more power than the sealed boxes. Sealed boxes give you less power from your sub and are a little flatter. Some say that the bass is more accurate and tighter , depending on the type of music you play. Rock you would want a tighter bass(sealed) and hip hop or techno style you would want a deep bass(ported). Lastly you have the free air which gives you the least amount of bass and is usually rather flat sounding. If you have the room go for the band pass box, if room is an issue than go with a sealed and specifically design box for you vehicle. Alot of places design boxes for almost every car out there. Just make sure that have a well designed box, It makes a world of difference, than an improper box.

May 22, 2010 | Alphasonik PSW412 Car Subwoofer

1 Answer

Want to find out the best type of enclosure for 2 lanzar max pro 124d subwoofers

you best type of enclosure will be a sealed enclosure or you can build it with a partition in the middle seperating the 2 subs and port each side.

heres a link that will give you the specs for your sub

Sep 07, 2009 | Lanzar (Pair) MAXP104D Max Pro Series...

1 Answer

I have a 12W7 jl sub with no enclosure or amp.

Hello cdoran93,

Well, "best" and "loudest" are mutually exclusive. You can configure for one or the other, but not both at the same time.

The best (most accurate) bass is produced from a sealed enclosure, while the loudest (highest spl) is produced from a properly tuned ported enclosure. The recommended sealed box volume is 1.375 Cu.Ft. Ported is 1.75 Cu.Ft. For a ported enclosure, you need to decide what frequency to tune it for and then look at the JL specifications to the size of the port. has both types of enclosures at prices starting around $70.

Hope this helps.

May 11, 2009 | Jl Audio 12W7 Car Subwoofer

1 Answer

Choice of speaker box

If you're looking for SPL (LOUD) go vented.
If you're looking for tonal accuracy (Sound Quality) go sealed.

The tradeoff between the two is that a ported enclosure will allow your subs to play highly powered. More air flow - better cooling of the voicecoils.

Sealed enclosures dont like much power because the coil cannot breathe and heats up rather quickly.

Its up to you, and your listening type.
Just remember LOUD = PORTED

Bandpass is kind of a mixture of the two, however you give up some of the frequency range the sub plays at - and I dont ever recommend a bandpass enclosure to my customers unless they are looking to be flashy and light up the cones or magnet assemblies.

There are advantages and disadvantages to every enclosure type.
Pick the one that best suits your taste, and be sure to fire it toward the rear of the vehicle for the best response and cabin gain.

Thanks for using FixYa - a FixYa rating is appreciated!!

Feb 24, 2009 | Pioneer C-Type TS-W306DVC Car Subwoofer

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The best bass in this case

HERE is the owners manual for your sub.

If looking for LOUD, ported enclosure is the way to go.

If looking for accuracy, build sealed.

You dont have enough depth for an isobaric setup.

using the maximum dimensions given, 8x13x41, the volume of the biggest enclosure you could make (assuming 3/4" MDF material) is 1.7cu ft.

To tune this 1.7cuft box around 50Hz, you need (1) 4" round port 5" long.

MTX recommends an enclosure of 2cuFt ea. You will only be able to use 1 subwoofer in this application.

Even a sealed enclosure is recommended 1.25cuFt.

You can shove 2 in the vented enclosure, but you may not be happy with the outcome.

Thanks for using FixYa - A Fixya Rating is appreciated!!

Jan 27, 2009 | Car Speakers & Subwoofers

2 Answers

What size enclosure (sealed)for Alpine 12"1242D(METAL Music)

  • 12" subwoofer with dual 4-ohm voice coils
  • Kevlar reinforced pulp cone with Santoprene™ rubber surround
  • cast aluminum frame with perimeter venting
  • frequency response: 25-500 Hz
  • power handling: 200-500 watts RMS (250 watts per coil)
  • peak power: 1,500 watts
  • sensitivity: 85 dB
  • top-mount depth: 7-5/8"
  • sealed box volume: 0.57-1.0 cu. ft.
  • ported box volume: 0.75-2.0 cu. ft.

  • For rock, i actually have 2 seperate 12's in slot port boxes i built facing forward. Facing forward reduces a little resonance and spl, but keeps alot of that annoying rattle off your tag lol

    Hope this helps :)

    Dec 10, 2008 | Alpine Type-R SWR-1242D Car Subwoofer

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