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Hey, I know I’m kind of putting the cart before the horse here, but I ordered a custom fit box for my new car and finding a sub that seems to fit it’s specs are a little hard. Box specs are listed below, I ordered the single 12” round cutout. I already have an amp that will make 600W rms at 4ohm (Arc Audio 1200.6 channel 5&6.), but I’m willing to get another one if I have to. I’d like to spend around $500, I’d maybe spend more if it was worth it. Max budget is probably like $800.

Mounting depth - 7 5/8" (based on a sub w/ 6" magnet)
Mounting diameter - 9 1/8" for 10" subs & 11 1/8" for 12" subs.
Total volume of airspace - 1.94ft^3
Chambers - 1 for one sub, 2 for two subs, 3 for three subs
Style - Sealed (non ported)
Construction - Premium MDF
MDF thickness -0.75"
Finish - Carpet
Terminals - 1,2, or 3


Thank you in advance.
 

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Hey, I know I’m kind of putting the cart before the horse here, but I ordered a custom fit box for my new car and finding a sub that seems to fit it’s specs are a little hard. Box specs are listed below, I ordered the single 12” round cutout. I already have an amp that will make 600W rms at 4ohm (Arc Audio 1200.6 channel 5&6.), but I’m willing to get another one if I have to. I’d like to spend around $500, I’d maybe spend more if it was worth it. Max budget is probably like $800.

Mounting depth - 7 5/8" (based on a sub w/ 6" magnet)
Mounting diameter - 9 1/8" for 10" subs & 11 1/8" for 12" subs.
Total volume of airspace - 1.94ft^3
Chambers - 1 for one sub, 2 for two subs, 3 for three subs
Style - Sealed (non ported)
Construction - Premium MDF
MDF thickness -0.75"
Finish - Carpet
Terminals - 1,2, or 3


Thank you in advance.



Just verifying the info:


You have a sub enclosure that is ~1.94 cubic feet for a single 12" sub.



That sort of spec is sufficient for just about any sub I can imagine. Because the box is likely only one layer thick on the baffle, and likely has zero extra bracing, it will probably be best with more tame subs. Given your power level, the new Stereo Integrity SQL12 or current RM12 might be a good option. The airspace you have would put them below .7 Qtc, but with the power level you have, you wouldn't be in danger of bottoming them out. However, I would recommend adding at least extra bracing to the front baffle with that sub. Other than that, you can do the Sundown SA12, or a JL12W6, or an Audiofrog GS12, or just outside your budget but probably worth every penny, the GB12. Older Image IDQ's would work great in the size, as well. There's probably 100 other subs that would be fine, like the Adire Brahma, , or Shiva.. The sub matters less than the enclosure, as long as the sub is good enough. Sure, some of those might have a depth problem, but that's also resolved with an extra layer of baffle.
 

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Discussion Starter #3
Hey, I know I’m kind of putting the cart before the horse here, but I ordered a custom fit box for my new car and finding a sub that seems to fit it’s specs are a little hard. Box specs are listed below, I ordered the single 12” round cutout. I already have an amp that will make 600W rms at 4ohm (Arc Audio 1200.6 channel 5&6.), but I’m willing to get another one if I have to. I’d like to spend around $500, I’d maybe spend more if it was worth it. Max budget is probably like $800.

Mounting depth - 7 5/8" (based on a sub w/ 6" magnet)
Mounting diameter - 9 1/8" for 10" subs & 11 1/8" for 12" subs.
Total volume of airspace - 1.94ft^3
Chambers - 1 for one sub, 2 for two subs, 3 for three subs
Style - Sealed (non ported)
Construction - Premium MDF
MDF thickness -0.75"
Finish - Carpet
Terminals - 1,2, or 3


Thank you in advance.



Just verifying the info:


You have a sub enclosure that is ~1.94 cubic feet for a single 12" sub.



That sort of spec is sufficient for just about any sub I can imagine. Because the box is likely only one layer thick on the baffle, and likely has zero extra bracing, it will probably be best with more tame subs. Given your power level, the new Stereo Integrity SQL12 or current RM12 might be a good option. The airspace you have would put them below .7 Qtc, but with the power level you have, you wouldn't be in danger of bottoming them out. However, I would recommend adding at least extra bracing to the front baffle with that sub. Other than that, you can do the Sundown SA12, or a JL12W6, or an Audiofrog GS12, or just outside your budget but probably worth every penny, the GB12. Older Image IDQ's would work great in the size, as well. There's probably 100 other subs that would be fine, like the Adire Brahma, , or Shiva.. The sub matters less than the enclosure, as long as the sub is good enough. Sure, some of those might have a depth problem, but that's also resolved with an extra layer of baffle.
The airspace is correct, but I will verify if it has any bracing. My concern with having an enclosure that is too big is losing volume. I’m totally fine with getting a new amp if I have to to achieve a decent result. I am fine with spending the money on the GB12, would you say in your opinion that this is the best fit? Thank you for all your help.
 

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The airspace is correct, but I will verify if it has any bracing. My concern with having an enclosure that is too big is losing volume. I’m totally fine with getting a new amp if I have to to achieve a decent result. I am fine with spending the money on the GB12, would you say in your opinion that this is the best fit? Thank you for all your help.

Its just a lovely sub. If you get an enclosure that ends up WAY too big (though I would listen to it first), you can always add bracing or even just big blocks of wood to the box, to reduce internal volume.


I don't think you could ever go wrong with a sub as good as the GB12. It would feel very silly to me making a sub that amazing fit in a pre-fab box.



That said, there's so many subs that would do just fine, as I mentioned in the prior post. Its just a matter of budget and priorities. "Too big" a box reduces Qtc, which is a sound I like. It may reduce SPL but it sounds really clean and pure, with no overhang. You may find that sound really works for you. Low Qtc boxes also have more bass extension, and play louder, lower, with less power than a high Qtc box of otherwise identical design. There are trade-offs as with any sub.



The power you have, ~500W, is fine for almost any standard listening, especially if you expect your sub to play about as loud as a quality front stage would. If you doubled your power, you are only adding ~3dB of headroom, which is nice but certainly not required.




edit:


is this the guy? https://www.zenclosures.com/2006-11-Volkswagon-GTI-Subwoofer-Box-p/vwgti0611.htm


If so, popping in some bracing and doubling up on front panel would be a great move, for something as potent and exciting as the GB12. And keep in mind, the GB12 is highly efficient so 500W may be enough to keep you happy indefinitely.
 

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Thats box is too big for a RM12 or a GB12 sealed. Can you send a pic of the box?

Also whoever called the RM12 "tame"...may i roll my eyes at you? :):rolleyes:
 

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Discussion Starter #6
The airspace is correct, but I will verify if it has any bracing. My concern with having an enclosure that is too big is losing volume. I’m totally fine with getting a new amp if I have to to achieve a decent result. I am fine with spending the money on the GB12, would you say in your opinion that this is the best fit? Thank you for all your help.

Its just a lovely sub. If you get an enclosure that ends up WAY too big (though I would listen to it first), you can always add bracing or even just big blocks of wood to the box, to reduce internal volume.


I don't think you could ever go wrong with a sub as good as the GB12. It would feel very silly to me making a sub that amazing fit in a pre-fab box.



That said, there's so many subs that would do just fine, as I mentioned in the prior post. Its just a matter of budget and priorities. "Too big" a box reduces Qtc, which is a sound I like. It may reduce SPL but it sounds really clean and pure, with no overhang. You may find that sound really works for you. Low Qtc boxes also have more bass extension, and play louder, lower, with less power than a high Qtc box of otherwise identical design. There are trade-offs as with any sub.



The power you have, ~500W, is fine for almost any standard listening, especially if you expect your sub to play about as loud as a quality front stage would. If you doubled your power, you are only adding ~3dB of headroom, which is nice but certainly not required.




edit:


is this the guy? https://www.zenclosures.com/2006-11-Volkswagon-GTI-Subwoofer-Box-p/vwgti0611.htm


If so, popping in some bracing and doubling up on front panel would be a great move, for something as potent and exciting as the GB12. And keep in mind, the GB12 is highly efficient so 500W may be enough to keep you happy indefinitely.
That is the box in question. Would you happen to know where I could look to find a guide on accomplishing that? If not, that’s ok. Thank you for all the info.
 

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Thats box is too big for a RM12 or a GB12 sealed. Can you send a pic of the box?

Also whoever called the RM12 "tame"...may i roll my eyes at you? <img src="http://www.diymobileaudio.com/forum/images/smilies/smile.gif" border="0" alt="" title="Smile" class="inlineimg" /><img src="http://www.diymobileaudio.com/forum/images/smilies/rolleyes.gif" border="0" alt="" title="Roll Eyes (Sarcastic)" class="inlineimg" />
https://www.zenclosures.com/2006-11-Volkswagon-GTI-Subwoofer-Box-p/vwgti0611.htm

That’s initially what I thought too, but the other poster offered some tips if it is indeed to large, such as adding a wood block.
 

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Thats box is too big for a RM12 or a GB12 sealed. Can you send a pic of the box?

Also whoever called the RM12 "tame"...may i roll my eyes at you? :):rolleyes:

Trust me, friend, that's not what I said. I used the word "tame" to describe the sub he should consider if he leaves the box untouched. If he goes with a GB12 or RM12, I recommended he upgrade that box to withstand the forces.
 

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That is the box in question. Would you happen to know where I could look to find a guide on accomplishing that? If not, that’s ok. Thank you for all the info.

You mean on making a box smaller or more braced? This requires modest woodworking skills, or at least an attempt at them. If you don't feel comfortable doing that, see if someone local to you does. If it were me, I would probably add a baffle to the front of the existing box, and try to sneak in all manner of bracing through the subwoofer opening. What amount of bracing I could fit in there remains to be seen. Bracing in the form of wood pieces placed as strategically as possible, to reduce cabinet flex.


You could also sell the box and have a professional enclosure made specific to the sub you desire, and in the end that would probably cost the same or close. Its all up to you.



You guys, I still don't get the whole "box too big" thing. With ~500W of power, he's not in danger of bottoming out the sub. Low Qtc alignments aren't a bad thing!
 

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Zenclosures says it can reduce the box volume on request. I'm assuming the purchaser would have to add their own additional bracing.

A local audio shop quoted me a price of $250 to build a sealed 1 cu ft box recently.
 
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