Speaker Boxes

[poonman]

Ok well i have to 12 inch eclipse subs and im using a box that has about 2sqf to big, i would like to have some of my trunk space back, wondering if anyone maybe has some specs for a 2cubic foot box or a nice design i can copy from. seen some NICE ones for the dodge stealth with 10's. just seeing if anyone has some ideas other then a square box. i can build anything but not really good with the whole math (Vbs,ohms,Vmax and crap) part of making boxes. here my specs, maybe someone made a nice box that sounds great with around the same specs as mine. im hitting 140db now but i know i can get about 150-60 though. i have the 4200

 

[roadrunner2176]

Most boxes are just that a box. its the face or the cover that shapes them. Use some of the box builder software online. Put in your requirements, wait a few seconds, and out pops all the information your need. 140db to 160db is a massive jump in loudness. Every 4 db equates to being twice as loud.

If you want them to sound loud in your car, and not everywhere else, fire them up. With the hatch down the rear end reverberates the sound causing the waves to intensify.

 

[DGajre777]

If you don't use your rear seats, take them out, fab up a box for the rear seat and you'll have all your trunk space. I have a sealed box for 2 x 12s, 1.0 cu ft each and I have about 4" of space towards the back.

I agree with roadrunner, I have mine fired towards the glass and they hit hard.

Every 4 db equates to being twice as loud.

Every 3 db not 4.

 

[poonman]

i want to keep my seats, i just want to know if anybody has ever made a box that fits in between the seats and the little deck before the truck drop or maybe hanging a lil over into the trunk, i seen it done a Dogde stealth which has a smaller trunk then a eclipse, ill try and find a pic of it to show everyone what im talking about, this guy dont have any specs though on what his cubic space is.

 

[EclipseRacing99]

if you are going for high db numbers you need a ported box it is very hard to hit high numbers with a sealed box. 140 db is very good for a car that is driven everyday. i wouldnt try to go louder than that unless you do db drag or a compitions on a regular basis.

 

[poonman]

i just want to take them to there max

 

[roadrunner2176]

A speaker doesn't have to be loud to be maxed out. Most speakers operate at their peak efficiency when their running at rms. Peak wattage is only what a speaker can handle for a short period of time.

I'm sure the box design your thinking of has been done before. I have seen them built between the shock towers about 8 inches deep, and just about any other way possibly. Before you go any farther you need to get your box dimensions and volume figured out. Odds are that what your trying to do will not fit correctly with what you want.

My mistake when I put 4 Db doubles your sound, to be honest is varies with what type of box your using. Doubling your db adds to distortion as well, so keep that in mind.

Heres a pic from a box I build a few years ago. Might not be what your looking for, but than again, I'm just giving you something to think about. Sealed volume is 1.2 cu ft for each speaker, ported volume is .56 cu ft. for each speaker. Top section is ported / tuned while providing air movement around the amps.

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[cbassgsx]

Every 3 db not 4.

actually its 10db is twice as loud. http://trace.wisc.edu/docs/2004-About-dB/ 3 is the threshold of audible difference. I'd also say pay a professional unless you have access to the proper tools to build a box. Hell I only charge $200 for a basic custom box. this is kinda cheezy buy it works and fits soooo (Btw not mine and I don't build this) http://cgi.ebay.com/ebaymotors/Cust...013QQitemZ230158434361QQrdZ1QQsspagenameZWDVW

 

[DGajre777]

Every 3db increase in audio is perceieved as the sound being twice as loud by the human ear. So a 120 db speaker will seem twice as loud as a 117 db speaker however, it takes twice the amount of power to get this 3db increase, i.e. 200 watts to get 120db instead of 100 watts to get 117db. 10 times the power gives an increase of 10db.

"When used as a measure of acoustic noise in the atmosphere, a 3 dB increment (approximately double the sound power) is also approximately double the perceived noise to an average human observer in the normal hearing range of frequency and sound power."

http://en.wikipedia.org/wiki/Decibel
http://ccrma.stanford.edu/CCRMA/Courses/150/SPL.html#SECTION00037200000000000000

Let's stick to the topic please, the original poster asked for information on building speaker boxes, PM me if you'd like to discuss SPL and dbs.

 

[poonman]

A speaker doesn't have to be loud to be maxed out. Most speakers operate at their peak efficiency when their running at rms. Peak wattage is only what a speaker can handle for a short period of time.

I'm sure the box design your thinking of has been done before. I have seen them built between the shock towers about 8 inches deep, and just about any other way possibly. Before you go any farther you need to get your box dimensions and volume figured out. Odds are that what your trying to do will not fit correctly with what you want.

My mistake when I put 4 Db doubles your sound, to be honest is varies with what type of box your using. Doubling your db adds to distortion as well, so keep that in mind.

Heres a pic from a box I build a few years ago. Might not be what your looking for, but than again, I'm just giving you something to think about. Sealed volume is 1.2 cu ft for each speaker, ported volume is .56 cu ft. for each speaker. Top section is ported / tuned while providing air movement around the amps.

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See roadrunner knows exactly what type of box im talking about, i dont mind it going a lil into the trunk past the strut towers but i like to keep stuff in my trunk thats why i want to keep some space, my subs require i beleive 1.2 cubic ft per sub so 1.2x2+ 2.4. I love your box by the way mad nice.

 

[roadrunner2176]

Its a decent setup. Not like it's beautiful or anything, but it's a hatch that I can still put stuff in there and keep it covered with the hatch cover. Sound quality is very good as well. Doesn't get distorted, but thats because I tuned it properly and used a good speaker for sound, not just for loud, annoying bass. The sides are on hinges so you can use that for storage as well, or put a cd changer in there.

 

[Cobrasatellite]

Look up the Peanuts method of measuring cubic feet. Its simple and pretty accurate. Then tape off a rear corner of the trunk and fiberglass away. If you are good with glass already just remake the side panels in the trunk integrating the box into the panel.

 

[99gst_racer]

Ok well i have to 12 inch eclipse subs and im using a box that has about 2sqf to big, i would like to have some of my trunk space back, wondering if anyone maybe has some specs for a 2cubic foot box or a nice design i can copy from.

Back in the day (2000-2001), I used to compete in db drags. I had many different set-ups over the years, but one of my smaller set-ups was a pair of Eclipse 12" aluminums. We built a sealed box for them; it was 1 cubic foot per speaker, and had an internal divider. Most of the competition laughed when they saw it; they all had huge ported/vented boxes, and our box was tiny. Our best was a 145.5 that day. That was a full db higher than anything else in our class.

For that, I would recommend a small sealed box for them. Basically build it around the sub. One cubic foot per speaker, and dont worry about taking into account for speaker displacement.

 

[InfiniteGSX]

There was something I saw on some website that was what I was looking for... those boxes above are too big.. I'd like to keep some of my trunk space ...