dustin420

does anyone have experience building this type of box? well for the time being im gonna use one atlas and figured since i've allways wanted to try this box design heres my chance. this is what i have so far. max dimensions 14-h 37-w 20-d so around 4.7cf, ok now i was gonna make chamber A 14x26x20 so 3.2cf and chamber B 14x11x20 so 1.2cf. now using one 4inch port 15 inchs long chamber a would tune to roughly 25hz and chamber b would tune to roughly 43hz. so how would this do? i tried to stick as close as possible to the 1/3 rule. also tuning that low will i lose my upper end response, like in the 60+hz range?

ya i know but that what turned me towrds these types of boxes.

pretty much ya, you can adjust the 2ohm coil in any box to meet your listening preference.

what 12 was it? i want to an abc box because a while back i remember a guy onn the ecoustics forum doing an abc box for 2 6.5's and metered like low 130's in a trunk car with a flat response from 40-65hz which i thought was very good coming from a box to me wouldn't be hard to design.

found this link http://clubknowledge.com/Car_Audio_FAQ/archives/3492.html pretty interresting read.

ya i know but will the sub still sound decent on rock music with bass gutair and kick bass?

opps my bad, i meant high qts seemed to have better low end and spl in a sealed box while the low qts was real punchy, and tight. also yes changeing the qts will change other specs as well and box size, 1.25 would seem good for a 12. when i make boxes i allways make them a tad small then if i don't like the sound i add pollyfill. the pollyfill makes the sub think the box is larger then what it is, it also dampens the back wave so it doesn't work against the cone, resulting in better low end. also to vladd i see what your saying now, i was thinking of something way different.

then how do you wire 1 atlas is series?

hmm i guess mine are broken.

i see, your talking about 2 atlas's and wire the gold terminals to the other subs gold terminals right? im talking about just 1 atlas and wire the gold terminal to itself.

first edited previous post. yes i know the gold are 2ohms and adjust the qts from high-mid-low, but if you wire the gold terminals in serires, with a jumper wire it does not affect the silver terminals ohms.

ok i'll just agree, since i have no clue how your getting 6ohms from a svc4 sub. edit: i guess i'll explain why i don't get it. the atlas is svc4 right, the gold terminals do not affect impedance so 1 atlas is allways 4ohms no matter how the gold terminals are. so if you wire 2 atlas is serires thats an 8ohm load in parrallel its 2ohm am i right? so i guess im trying to figure out where the 6ohms is coming from.

damn!!!!!! are you using 4 IA40.1's like it says in your sig? thats a sh1t load of power.

he is? then where is he getting the 6ohm load from since the atlas is svc4?

im sorry but it does not affect the impedance, i tried. i hooked a dmm up it read 3.1 with the gold terminals open then i ran a jumper wire across the gold terminals and the impedance did not change.

nice score. doesn't ss xxx's use the 4hp motor?

the atlas is not like that, the 2ohm VC will not change the other VC impedance. i know i tried and it did not work, granted doing that will change how impedance rise affects the sub but overall impedance will not change. genrally speaking high qts sound and get lower in sealed boxes compared to low qts. i tried this with my 15's in 2.3cf sealed boxes with the low qts the sub seemed louder had better low end, when i tried the low qts the sub was very punchy and tight and did not have the low end compared to the high qts. i say try both and see which you like more.

ya there great subs, very good sq and decent spl for only 350rms. i have 2 15's im trying to sell if anyone is interrested.

heres a short vid of my atlas 15 in the grand am, its running off a RE12.1 amp at 4ohms so around 350wrms. gets decently loud and trunk rattle is really bad. hopefully i can find someone with a camra so i can take longer vids since my memory card is full. 3dbNM31vSE4

ok the atlas is only svc4ohm the gold terminals are only used for adjusting the qts. DO NOT PUT POWER TO THE GOLD TERMINALS. doing that will fry the VC. just hook up power to the silver VC t will be 4ohm well around that mine were 3.1ohms, anyway though the gold terminals only adjust the qts if you need specs i have ts specs for the atlas 15 for all three qts configurations if you need them.