SA 12 Ported behind my seat

[Wood. 24]

Okay, so ive been trying to decide what i want to do with my 600 dollar tax return. i get it in a week. =) not bad for only working two months eh? lol anyways...

I have a 96 tacoma regular cab pickup with the bench seat in it. I have had a few systems in it.

I have a brutus bxi2008d.

My PLAN is to get an SA 12 and build a box as big as can behind my seat. (after many measurements and few boxes that ive already built i think i can get about 2.3 cube inside of a 3/4 box before any displacements) with that said onto my questions...

i have been using the12volts calculator for port length....

with from i have heard the general rule of thumb is 12-16 inches of port area per cube correct?

if i were to be using a box roughly 1.75-1.9 (after displacements) that would call for 21-30" of port.

and a six inch round port is 28in^2 right? so according to to 12vols calc a 6" round port in a 1.75 cube box needs to be 35.6" long!?!?! (tuned to 33) And the airspace a 6"x35.6" port would roughly take up is like over have a cube!!!! if i can even possibly get 2.3 cubes that would leave me with 1.8 cubes before the sub. after that im like 1.6 something...

long story short, am i dreaming trying to get this SA in my truck? lol i dont want it to sound peaky as hell, i listen to all kinds of music... or any other subs in this price range that like smaller enclosures? ive heard dc's do, but im not sure on there prices for the lvl 3? less than 250? (want to be able to get another batt, bunch of 1/0, volt meter, connection accessories, and maybe a cheap two ch with this money also)

like im open to suggestions. got one twelve sealed now, have had two twelves sealed. but i wanna go ported now. might do two 8's? im worried about them moving air lowww though... seen them hit high numbers but all at high tones... so idk...

sorry if i left any details out...

Edited February 23, 2011 by Wood.

[hondakilla98 29]

If you run one 12 ported. Could you do an external aero port? Maybe come out of the top of the box and run sideways across the top of the box?

[Wood. 24]

after losing more sleep i decided to just run two sa 8's in a 1.25 cu box with a 2x8x32 slot port tuned to 31. gonna run 1k to each. hopefully jake still has some. i cant wait for the v.2 lol.

just dont think i can get the airspace needed for the box and port for a twelve, or two tens, so ill just go with the safe route and do the 8 tuned low. hopefully they can perform like i want them to. might have to build a few boxes i guess...

sound like im on the right track for the 8s with my port design and what not? too little port area? i listen to mainly rap. mac dre/andre nickatina/bay area rap. sometimes ill slide in a metallica cd though...

as far as running the port across the top of the box, the box comes to a point at the top. im 6'2" my seat is one click from the farthest back, id like to have it all the way back but then i have NO room. but the top of the seat is pretty much resting against the back window right at the base. maybe a 1/2" between the two... i was thinking of an external port on the driver side, like coming out the bottom and then going up along the side of the box. if you get what im saying. but the port could only be like like 20" long, all the math ive been doing says this is just too small.

Edited February 23, 2011 by Wood.

[ssh 924]

Not sure how well the sa8s will handle 1kw each...

[smashedz28 110]

1000 to each 8? be careful.

[Wood. 24]

kinda figured that was coming, ill be really careful, im running 1000 to a memphis pr 12 right now havent had problems, i just dont wang on it all day. pretty much dont listen to my music loud normally, just when i show a friend or something i wanna be able to lean on em for a few seconds, and be like "yeah thats only two 8s." i know they wont be covered. i know they arent magical super subs, just wanna make sure im getting the full potential out of em.

i appreciate the looking out, not saying you guys are wrong either...

just kinda looking for some help on the port design and tuning, never built a ported box...

[ssh 924]

Well they'll take some abuse for short runs, so as long as you use some common sense and look for signs of stress you'll be okay.

[Wood. 24]

soooo after many box designs and fighting my 48x26x9x1.5 space ive come up with this. ive been on google sketchup/the12volt calcs for like 8 hours trying to get a box to fit...

anyways what i came up was a 1.6 cu ft GROSS box. with a 2x9x30" port, 18 inches of port area. the port will be half in the box and half out (just what worked best after many designs)

with the math i didn the portion in the box will be .2 cu ft, and each sub being .10 (correct me if im wrong) bringing the total disc to ~.4 cuft leaving the net volume enclosure being 1.2 cu ft. or .60 per sub.

if this is sounding kosher im ordering the subs.

[///M5 2,833]

Seems to me you have more space considering your port is just hanging out. If that is the case, more cone area is your friend. It could surely also help if you are truly trying to use 1kW per driver....which makes no sense on those 8's btw.

[Ohjay 116]

I bet you could fit 2 10"s back there if you really tried

[Wood. 24]

ive tried two tens before... i really dont think there is enough air space. the biggest box i can make is 47x26x9x1.5 thats a 2.4 cu ft gross box. after JUST SUB discplacement the box is to its net size. where am i supposed to put a port after that?

hence me moving down to the 8s.

and the total width of that box and port up above i posted is 47 inches, the ACTUAL box itself is only like 36 inches wide. thought about making the box the full size and putting the entire port inside the box but i was kinda wanting some area to the side of the box to mount my amp and battery.

and yes id love to have the cone area also, but like i said i kinda want the wow factor of the 8's. i appreciate your guys' input, im open to trying to fit two tens in there if you can help me figure it out, I'd much rather be louder than just cool. if you get what im saying....

this is the biggest box i can make. my trans hump and a cross brace are already taken out...

[Wood. 24]

This box sounded horrible. had two 3" ports on each end. did not sound good at all. it was like a total of 2 cubes, i didnt build it or do the design/tuning. i was very unhappy and returned the subs...

i dont want that to happen again. im getting very frustrated, im thinking i just need to go back to two 12s sealed. maybe 4 tens sealed? idk... i cant make up my mind, i thought this two 8s box was golden....

help me pleeeaaase. this money is burning a hole in my pocket and i need more BASS!!!

[nigel 148]

were those subs right up against the back of your seat? If so, then that could be why you were so unhappy. With a box like that in a reg cab, you really need to make sure to leave room for your cones movement.

Also, you say you didn't design/tune the enclosure, and were unhappy so you returned the subs. But, if you didn't design the box, are you certain it wasn't the box that was the issue? Proper design accounts for a lot.

I think doing (2) 8" drivers in a proper ported enclosure, has a lot of potential. If done right.

[Dictator1992 6]

...I dont mess with trucks when it comes to enclousures to much of a headache just do what other people do go buy another vehicle for 2k wagon , hatchback etc if you got 600$ for federal in 2months must of made 6000$ just save some money up with that nice job you got and get a second vehicle worth the wait for a loud a&s system.

Edited March 2, 2011 by Dictator1992

[Wood. 24]

im doing a blow through...

and the subs werent hitting the seat. and yes it was the box that made them sound shitty, same place i bought the subs from designed the box.