Question about Phoenix Gold QXE-108 Car Subwoofer

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I am trying to find specifications and optimum enclosure volumes.

I am trying to find specifications and enclosure sizes for a QXe-104. I have aquired one that has never been used. I know it is about 8 to 9 years old, but like I had mentioned, it has never been used and has been stored inside (at room temp) in it's original box - unfortunately though, no documentation came with it. Ideally, I am looking for optimum sealed or vented enclosure volumes. Sealed being my preferrance - I would like to know the best volume for the enclosure. (l know that smaller enclosures will take up less space in the trunk, but I am looking for the ideal volume for a sealed enclosure for this QXe-104 - I also know that vented enclosures are larger, but I would also like to know the ideal volume and vent length/diametre for the same subwoofer in a vented enclosure). If you have any other suggestions that will give me rock-solid bottom end performance (the lower I can have this sub play, the better - that is why my preferrance is sealed) that would be appreciated as well. I will be powering this subwoofer with an amplifier that will deliver the maximum power that this subwoofer can handle - that is the main reason why I would like to have the optimal volume for a sealed enclosure (I will not be using any discount amps or amplifiers that are not very reputable)). Any advice or specifications that you can offer me would be greatfully appreciated.
Thank You, Thomas.

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Visit the12volt.com, or i think that is what the url was. been a while but my buddy was an installer and he swore by the website.

anyways just trying to be helpful

Posted on Mar 13, 2009

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You can do the math by H x W x D then divide that # by 1728 (for 12" speaker) to get your enclosure volume (cubic feet).
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Hi,
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:
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To get this you would need to build the box to these dimensions:
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The port needs to be:
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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
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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.

www.crutchfield.com has both types of enclosures at prices starting around $70.

Hope this helps.

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1 Answer

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Hello miles_jamike,

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You should try to stay pretty close to the recommended enclosure volume for best performance. A good volume calculator is located here on the12V.com website. Just enter the proposed width, height, depth, and material thickness and click the "=" to get the CuFt.

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If you intend to purchase a generic enclosure, the Goldwood shown here at Parts Express is an exact fit. Atrend also makes good generic enclosures, their model 12SAL in a sealed box with 1.20 CuFt and the 12LSV ported with 2.50 CuFt would be good choices.

Crutchfield has both generic and custom enclosures made by JL, MTX, QLogic, and Bass Slammer. Crutchfield has excellent support. They will respond promptly and positively to your phone or email inquires. If you have never ordered from them, you can use a "friend referral code", such as mine, which is: p7sdj-hrx8q-9800g, and on any order of $200 or more, you receive a $20 discount. And I get a $20 credit on a future order. Also, many orders qualify for free shipping.

Hope this helps.

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  • power handling: 200-500 watts RMS (250 watts per coil)
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