: Custom Sub Enclosure For 2000 Deville Help



cadillac_pimpz
03-05-08, 08:15 PM
Im thinking about building a custom enclosure for my 2000 deville. I have seen it done and it seems easy enough. hahaha What I want to do is have 2 15" subs in the middle and have the sides curved or at an angle with 2 inverted 12" subs. no ports. any advise? any reason why I can't do this? My dad can help me build this, we can get all the materials and are good with woodwork.

GizmoQ
03-06-08, 02:13 PM
Are you going to be running active EQ? Without tuned ports, it all gonna rely on the box build otherwise, and SQL tuning of the two different sizes is not going to be easy. What have you got planned for the rest of the system?

cadillac_pimpz
03-06-08, 05:48 PM
Are you going to be running active EQ? Without tuned ports, it all gonna rely on the box build otherwise, and SQL tuning of the two different sizes is not going to be easy. What have you got planned for the rest of the system?

huh? I don't know what your talking about. so thats prolly not good. btw, how do you mount inverted subs?

GizmoQ
03-07-08, 01:00 AM
huh? I don't know what your talking about. so thats prolly not good. btw, how do you mount inverted subs?

Same as otherwise, but with the butt out.

You never said whether your goal was volume (SPL) or clarity (SQL). I asked about the rest of your system????

O.K. I'm no good explaining this stuff (I just crunch the numbers), but each sub is designed for a specifically sized amp and box to achieve maximum performance at a given frequency. Changing the box size changes the optimal frequency. Change it too much from the designed parameters reduced the efficiency of the speaker, i.e., lower volume and less range. Porting the box changes the optimal frequency and the velocity of the speaker response. In a perfect world, 15" subs will give deeper, more noticeable sound reproduction of lower frequencies than 12" subs. However, the 12" subs will recover faster keeping the sound from becoming muddy.

Some reading to get you started:

Types of subwoofer (http://www.diyaudio.com/wiki/index.php?page=Types+of+subwoofer)
Subwoofer FAQ (http://www.diyaudio.com/wiki/index.php?page=Subwoofer+FAQ)
Subwoofer Enclosures (http://www.the12volt.com/caraudio/boxes.asp)
Subwoofer Enclosure Calculators (http://www.the12volt.com/caraudio/boxcalcs.asp)

ryansts
03-07-08, 09:02 AM
I would just go with the 2 15s. Whenever you start mixing and matching sub sizes you are setting yourself up for a lot of problems. Besides, most subs require a fairly large box to sound there best, so you would lose almost all of your trunk space with 4 subs in there. A couple of decent 15s in a well designed box will give you more than enough bass. Anything more really is unnecessary and it adds weight, complexity, and is rough on your battery/alternator.

cadillac_pimpz
03-07-08, 11:06 PM
Same as otherwise, but with the butt out.

You never said whether your goal was volume (SPL) or clarity (SQL). I asked about the rest of your system????

O.K. I'm no good explaining this stuff (I just crunch the numbers), but each sub is designed for a specifically sized amp and box to achieve maximum performance at a given frequency. Changing the box size changes the optimal frequency. Change it too much from the designed parameters reduced the efficiency of the speaker, i.e., lower volume and less range. Porting the box changes the optimal frequency and the velocity of the speaker response. In a perfect world, 15" subs will give deeper, more noticeable sound reproduction of lower frequencies than 12" subs. However, the 12" subs will recover faster keeping the sound from becoming muddy.

Some reading to get you started:

Types of subwoofer (http://www.diyaudio.com/wiki/index.php?page=Types+of+subwoofer)
Subwoofer FAQ (http://www.diyaudio.com/wiki/index.php?page=Subwoofer+FAQ)
Subwoofer Enclosures (http://www.the12volt.com/caraudio/boxes.asp)
Subwoofer Enclosure Calculators (http://www.the12volt.com/caraudio/boxcalcs.asp)

so is mixing the 2 sizes not a good idea, becuase if its not then I will just forget about building a new enclosure. I just got the idea cus I still have the 12's from when I upgraded to 15's.

GizmoQ
03-10-08, 06:21 PM
so is mixing the 2 sizes not a good idea, becuase if its not then I will just forget about building a new enclosure. I just got the idea cus I still have the 12's from when I upgraded to 15's.

It depends on what your goals are. If you want show quality, there's a number of ways to do it that would look awesome (but costly ~$1000). If your goal is sound quality, vented 15s and sealed 12s could be tuned to get incredible response from 18-150Hz, but if you're running the standard Bose up front its a waste of time. If you're after louder bass, adding 2 12s is only going to net you a ~20% gain in volume and that's only if the amp/sub combinations are matched at max capacity on all 4 subs.

Bottom line, my recommendation get a bigger, better, cleaner amp for the 15s you have, tune the amp for the enclosure/subs you already have and be happy.

cadillac_pimpz
03-10-08, 09:46 PM
It depends on what your goals are. If you want show quality, there's a number of ways to do it that would look awesome (but costly ~$1000). If your goal is sound quality, vented 15s and sealed 12s could be tuned to get incredible response from 18-150Hz, but if you're running the standard Bose up front its a waste of time. If you're after louder bass, adding 2 12s is only going to net you a ~20% gain in volume and that's only if the amp/sub combinations are matched at max capacity on all 4 subs.

Bottom line, my recommendation get a bigger, better, cleaner amp for the 15s you have, tune the amp for the enclosure/subs you already have and be happy.

I'll just stick with the 15's for now and get back on selling the 12's. I'll probably do a different system with my next car or when this one blows.