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View Full Version : spl design in 1998 blazer 4 door, any help?



ktraughb
06-16-2011, 10:42 PM
I have a 1998 4 door blazer with some pretty good space to work with. i know there are many options to make this car loud, i just wanted to check to see if anyone has seen or personally built good spl enclosures for these vehicles. ill be using 2 12s, undecided on brand/model right now; a little over 4kw of power, 2 batteries etc. I can make all this fit no problem, but ill work it around a box design. i want to put the box first on space priority. i probably do not want over 4 cubic feet internal total after all displacement. i am open on suggestions to direction of ports and direction of firing subs. also willing to design for slot or aero. prefer slot for cost and ease of more port area. i actually havent even tested the res freq of this vehicle yet but iirc a previous teammate had one that peaked about 49ish, therefore ill prob tune in the range of 41-43. any help is appreciated. btw the guy im mentioning used a box for 2 12s, with 4-4 inch aeros and 2500 watts and made some pretty good numbers(very run of the mill design), so im sure a little better design can do even better with more power. any help is appreciated in the meantime. and i think the best dimensions i have to work with are about 38.5 wide, probably about 20 high (meca), and prob no more than 28 deep if ports face rear, but otherwise ill have about 32 inches depth if ports face a different way.

pro-rabbit
06-16-2011, 10:49 PM
Subs up and port back was the best in my application until I walled it off.

ktraughb
06-16-2011, 11:40 PM
Any ideas on slot vs aero? And how much space for each u think?

pro-rabbit
06-16-2011, 11:49 PM
All of that depends more on your setup. I did slot in mine and the ft3 per driver and port area will depend on what drivers you get.

ktraughb
06-16-2011, 11:55 PM
The subs I plan to use are either am bass hd 12s or a different sub modeled very closely to a nightshade 12. Its a local builder

ktraughb
06-17-2011, 04:45 PM
Ive seen somewhere of the earlier models using sub up and portport to drivera side. Would thisu work on mine?1998 4 door? If I do a box with port yo rear ill prob do a slot port on one side of the box and the two subs up. Slot port would be bent inside and box would prob not be too deep to leave room for amps and batteries.

ktraughb
06-17-2011, 04:47 PM
Sorry for typos. My phone is freaking out

bimmerbase
06-17-2011, 07:19 PM
Subs up and port back was the best in my application until I walled it off.

What did your wall consist of?

pro-rabbit
06-17-2011, 09:03 PM
What did your wall consist of?

4 12s and 2 3500Ds as it sits

bimmerbase
06-17-2011, 09:08 PM
4 12s and 2 3500Ds as it sits

A wall with four 12's? Sounds weak.

Mookie
06-17-2011, 09:11 PM
Sounds weak?? Uhhh..

Kangaroux
06-17-2011, 09:11 PM
A wall with four 12's? Sounds weak.

lol

ktraughb
06-19-2011, 01:16 AM
Any other experiences. I may try subs forward and ports to rear. External aero ports.

Savag3
06-19-2011, 02:14 AM
nah bro subs up or back . prolly horizontal port full length firing back get sum deadner an get sum TSNS 12's peaxe ! : D

ktraughb
06-19-2011, 02:49 AM
U mean like a horizontal slot port at the bottom of the box facing to the rear? Im still thinking about using aeros however. Can do internally if there is a benefit to it in suvs

T.I.K.
06-19-2011, 03:02 AM
A wall with four 12's? Sounds weak.

maybe you missed the part where they were on 7kw?

ktraughb
06-19-2011, 03:07 PM
maybe you missed the part where they were on 7kw?

Not to mention a properly designed wall can be loud with less cone area and less power. Im sure it's nasty.

ktraughb
06-20-2011, 11:26 PM
I think im doing 2 12s facing up. One 8 inch aero port inside the box. Can't do external. 4 cubes after displacement tined to 41. You guys think 41the is too low in there?

---------- Post added at 10:26 PM ---------- Previous post was at 10:25 PM ----------

Port to rear at bottom of box btw

05trailblazer
06-24-2011, 03:35 PM
i would think it would sound better if both the port and the subs are facing the rear. and also if the port is too close to the rear is not going to sound that good.

pro-rabbit
06-24-2011, 03:38 PM
This is for spl, keeping the port with in 3" of the rear will normally increase the spl in blazer from what I have tested.

bgowdy31
06-24-2011, 04:02 PM
This is for spl, keeping the port with in 3" of the rear will normally increase the spl in blazer from what I have tested.

question..... i also have a blazer. so your saying 3 inches from the hatch may increase the SPL? is thats for a Burp or Like Bassracing? cause i dont do burps. i do a bass race type of comp

pro-rabbit
06-24-2011, 04:19 PM
I was testing both. Remeber the each vehicle will load a bit diiferent, but depending on your current set you should increase.

bgowdy31
06-24-2011, 04:26 PM
i have a 18 HDC3 5.6cu 8 inch slot/lport(im kinda thinking the portmay be a tad big) subs firing up port back... what do you think

pro-rabbit
06-24-2011, 04:31 PM
Any pics of how it sits?

bgowdy31
06-24-2011, 04:40 PM
actually i dont. its sits back to the rear seats while they sit up so ports about 7 - 10 inches from hatch

05trailblazer
06-25-2011, 12:39 PM
i've had a blazer myself had two twelves both the port and the subs were facing the rear and i had them like about seven inches or so from the back door and sounded great i tried outting them closer to the back and gave me a diffferent response i think because the the closer you put them the less waves expand. thats my opinion.

ktraughb
06-27-2011, 12:15 AM
I was thinking about stopping right where the cargo tie down hooks are,which is about 4to inches. Looks like ill end up doing about 3.75 for 2 12s, a single 8ex inch aero inside the box tuned to about 41. Buck, if you don't mind to would you double check what port length that would require overall with the flares?
I think about 15.7 ish if I calculated correctly.

pro-rabbit
06-27-2011, 12:18 AM
I was thinking about stopping right where the cargo tie down hooks are,which is about 4to inches. Looks like ill end up doing about 3.75 for 2 12s, a single 8ex inch aero inside the box tuned to about 41. Buck, if you don't mind to would you double check what port length that would require overall with the flares?
I think about 15.7 ish if I calculated correctly.

In order to check the tuning, we would need the following..

Actual enclosure size
woofers used
what bracing if any
This all can change tuning and port length and tuning

ktraughb
06-27-2011, 12:24 AM
I've got plenty of room so 3.75 will be after displacement of ports and subs using 2a american bass hd 12s. 1 inch wood with 45sthe in corners and no other bracing.

ktraughb
06-28-2011, 12:55 AM
may tttry a box with subs forward and port to rear. Has anyone ever tried this with a slot port instead of aero ports? My existing amp and battery rack is 27a inches long and 11I inches wide and stands 17 inches high. This leaves 27 inches wide, 17 high and about 27 deep. If I use an aero with this space it would need to be internal. If I put the amps on the floor and move the bats I can use an external aero. Thoughts? Im not against subs up and port back with either slot or aero, just thought of trying something different.

05trailblazer
07-03-2011, 05:13 PM
im thinking of putting four twelves 2 pioneer premiers, and two l7 12in as well in a blazer in thinking of doing two individuaL BOXES

05trailblazer
07-03-2011, 05:15 PM
How do you all figure out the port displacement????