PDA

View Full Version : suggestions for a SX15 box



terry6405
04-09-2006, 02:27 PM
ok, i have an sx 15 and i just got some aero ports--4 4" about 17" long(from partsexpress.com)--and i was wanting som suggestions on my box build for it. its going in an 89 accord. im goin to face the sub out the rear and i will just tune it to whatever it comes out to with all my ports- sould be between 35 and 38 hz, which should be fine becasue im a little disapointed with th volume @ 32hz

the max, and i mean max because ill have to take out some stuff and kick it a few times to get it in, is:

31" wide x 17" tall x 24" deep

how should i port it? which way should they fire?

should i baffle?

how should i brace? i heard allthread is a good way to go

im hopeing for about 5 net cu ft in the end, and how will that be for my SX? i have a 3.6 CF box now @ 32hz and im hoping that the areos, the extra room, and the higher tuning will make it alot louder cuz im a little dissapointed at the moment

DaGh0st
04-09-2006, 02:31 PM
i had my sx in a slot port @ 34hz in about 3.4 cubic foot after displacement and it was pretty **** loud! so theres something else wrong im thinkging
try ports shooting toward the rear of the car mabe?

terry6405
04-09-2006, 02:32 PM
i had my sx in a slot port @ 34hz in about 3.4 cubic foot after displacement and it was pretty **** loud! so theres something else wrong im thinkging
try ports shooting toward the rear of the car mabe?


was yours a sx15?

it is loud, but not as loud as my 2 12" v-maxes, thats why im a little disapointed

terry6405
04-09-2006, 02:35 PM
hopefully the areo ports help, at the very least they will give my sub more room than a slot port

hofulstrof
04-09-2006, 02:37 PM
this might sound stupid but have you tried swithing the phase of you your sub.(swtiching the + with the - )

terry6405
04-09-2006, 02:42 PM
this might sound stupid but have you tried swithing the phase of you your sub.(swtiching the + with the - )



wont that hurt it? i have it right as it is

unless the amp is switched, but i have the phase at 0

DaGh0st
04-09-2006, 02:52 PM
Yes mine was a 15.
how much power did you have going to the 12's the reason the 12's were louder might be because they had optimal space and power where as the SX need a lil more room mabe?

terry6405
04-09-2006, 03:00 PM
thats y im building a bigger box,

the 12s had a bx1205 and had a box with about 1.5 cu ft to each sub tuned to 40 hz

swimfreak26
04-09-2006, 03:01 PM
You've got plenty of space for it so don't worry too much there. I always perfer the simplicity of a slot ported box, but if you've got the aero ports go ahead and use them.

I've used an SX 15 in ~3.5 cubes tuned to 33-35Hz (don't remember exactly what the current box is that my brother's running) and it's loud, just flat out loud. You shouldn't be disappointed in the output at all. I'd look to go right around 3.5 cubes @30-35Hz depending on your taste, with about 45-50 sq inches of port area.

Check the sticky that moe_lester made and see if he's got a box up that'd work for you around that volume.

terry6405
04-09-2006, 03:01 PM
wont my amp go into protect if i turn it up if its out of phase?

terry6405
04-09-2006, 03:03 PM
well i want to give it as much room as i can

i think i may need to turn up the gain on my nine.1 but im afraid to becase i have 6.5v preamps supposedly so im not suppose to have it very high, right now its at about nine or 10 o' clock

terry6405
04-09-2006, 03:04 PM
4 - 4" areos = 50 sq in of port

bimma85
04-09-2006, 03:08 PM
well i want to give it as much room as i can

i think i may need to turn up the gain on my nine.1 but im afraid to becase i have 6.5v preamps supposedly so im not suppose to have it very high, right now its at about nine or 10 o' clock
gain setting tutorial ;) (under amp section)

www.pspinc.com port length calc

terry6405
04-09-2006, 03:10 PM
gain setting tutorial ;) (under amp section)

www.pspinc.com port length calc



i tried the gain setting tutoiral once and it came out that my amp was putting out way too much (like 54v), but when i fixed it, it was even less impressive

terry6405
04-09-2006, 03:16 PM
and like i said, i just want to tune it to what it comes out as so i dont have to cut my ports or anything


bigger the box, the lower its tuned so, again i want it as big as i can get it

should i double baffle?

terry6405
04-09-2006, 03:43 PM
im goin to work

hit me with suggestions and ill get back tonight

NhustlaR
04-09-2006, 03:52 PM
40 hz > 32 hz in spl

I have my SX in a 3.5 @ 35 braced slot ported box, and I couldnt be happier.

NhustlaR
04-09-2006, 03:56 PM
and thats running off an ultra linear "1200" watt amp(prolly running 700ish rms). idk how its not impressing you on a nine.1

its all in the install bro. I'd check everything back over, and make sure youre not screwing something up.

Insomniac119
04-09-2006, 04:41 PM
My SX 15" is in 4cuft @ 32hz. It sounds great, low bass sounds really low. SQ is just as good as a jl w3 but way louder.

terry6405
04-09-2006, 11:37 PM
pretty loud but i know is should be louder

any help on the box though

terry6405
04-09-2006, 11:38 PM
i wonder if im goin deaf?.........na

hofulstrof
04-10-2006, 02:22 AM
wont my amp go into protect if i turn it up if its out of phase?

turn you system off. go to the amp flip the switch to 180degrees and see if it makes a difference.

terry6405
04-10-2006, 08:14 PM
turn you system off. go to the amp flip the switch to 180degrees and see if it makes a difference.





good call

terry6405
04-10-2006, 09:19 PM
i think i found the problem, i noticed that the sub was sucking in instead of blowing out, but i tried to reverse the phase and i even tried to just switch the positive and negitive and no matter what it still ***** in. what the hells goin on???

hofulstrof
04-10-2006, 09:26 PM
switching the phase and reversing the + and the - are the same thing.


as for your sub sucking in ..... it probly just looks that way but it isnt really.

hofulstrof
04-10-2006, 09:27 PM
pics of the current box?

terry6405
04-10-2006, 09:35 PM
im pretty sure it is becasue i couldnt belive it eiather and i looked about a thosand times to be sure

terry6405
04-10-2006, 09:39 PM
simple slot port, nothing special

terry6405
04-10-2006, 09:52 PM
btw i cant tell the diff between the phases