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View Full Version : Help put two 15s in a Blazer, keep back seat.



SquishY
12-14-2012, 12:29 AM
This won't be my first box build, but it will be my first of this size. Will be trying to keep my back seats but if not, oh well. This will be my post tax time build, trying to get all my ducks in a row.
Two door blazer, two AQ HDC3 15s, one AQ 3500D. The space I have to work in is 37" wide, 19.5" tall(20.25", if you add the double baffle), 26" deep. Aiming for 6.5~ cubes after displacements, 32-33hz.
My current plan is four 6" round ports 38" long inside the box, obviously this is too long unless bending them should work in theory, but the only way I see to do it would be across the bottom starting in a corner and bend in the box like a few 'L's inside each other, would this be ok as long as their length remains the same? Or would it be a problem for the bend to be in different places on each port?

Kangaroux
12-14-2012, 12:35 AM
That is way too much port for a pair of 15's. Do like 150-175 in^2 of port along the bottom of the box using a slot port, way cheaper and you'll get **** near the same results

mylows10
12-14-2012, 12:36 AM
wont work ,the port noise would be really bad ,do a slot port in the middle of the back of the box

SquishY
12-14-2012, 01:10 AM
The four 6"s come to 114^2 but 150-175^2 is suggested in the same post, I'm confused; would you mind designing a better one for me Kangaroux?

mlstrass
12-14-2012, 04:16 AM
box is way too small, shoot for 8-8.5cubes net. For daily set ups I've never had good luck with smaller enclosures for HDC's. 3.75 is the smallest I've done for a 15 and it wasn't ideal.

frogcase2002
12-14-2012, 10:02 AM
id say 36.5w by 19.5h by 25.5d which makes it 8 3/4 cf inside and port 18 by 6 and 24" deep, would be about 7 after dis. tuned to 34

SquishY
12-15-2012, 10:13 AM
Made the box and little taller, got 9.56 gross cubes and 7 after a 7x21.5 port tuned to 33hz.

mlstrass
12-16-2012, 05:29 AM
Made the box and little taller, got 9.56 gross cubes and 7 after a 7x21.5 port tuned to 33hz.

Interested to see how that works out, so be sure to post when it's playing and how it sounds...

Austin175
12-16-2012, 09:44 AM
Interested to see how that works out, so be sure to post when it's playing and how it sounds...

+1

Falcons
12-16-2012, 10:42 AM
There is plenty of room for two 15's in a 2 door blazer. My dad has one.

RangerDangerV2
12-16-2012, 11:31 AM
go with about 3.5 cu ft per sub, subs up port back, with about 15-17 sq inches of port per cu ft. I would go with port center, but port along the bottom is another option...

pro-rabbit
12-16-2012, 12:36 PM
go with about 3.5 cu ft per sub, subs up port back, with about 15-17 sq inches of port per cu ft. I would go with port center, but port along the bottom is another option...

AQ subs like larger volume and large port area. 3.5 is to small if you want to keep a good low end.

RangerDangerV2
12-16-2012, 12:37 PM
AQ subs like larger volume and large port area. 3.5 is to small if you want to keep a good low end.

3.5 is large for a 15, he could get away with 3 cu ft per sub ill bet.

mazdakid
12-16-2012, 12:41 PM
Had 2 of the hdc3 15s in my 97 blazer in 7 cubes with 2 6" aeros and had no problem playing in the mid 20 hz range nicely.

---------- Post added at 10:41 AM ---------- Previous post was at 10:40 AM ----------


3.5 is large for a 15, he could get away with 3 cu ft per sub ill bet.

3.5 isnt large at all for a 15

pro-rabbit
12-16-2012, 12:46 PM
3.5 is large for a 15, he could get away with 3 cu ft per sub ill bet.

3.5 is not large. As far as "getting away" with a smaller box, yes you can many times. However there is always something lacking. You can play low with a small enclosure as well, just not with the same type of intensity you can with a larger volume ith those drivers. The idea behind designing is to get the most from the subs in the given application. Not to "make it work".

RangerDangerV2
12-16-2012, 12:51 PM
3.5 is not large. As far as "getting away" with a smaller box, yes you can many times. However there is always something lacking. You can play low with a small enclosure as well, just not with the same type of intensity you can with a larger volume ith those drivers. The idea behind designing is to get the most from the subs in the given application. Not to "make it work".

Sundown Ford Ranger ~ 2 - 15" Zv2 on SAZ-3500, 151+ db, Pure Pressure Concepts - YouTube (http://www.youtube.com/watch?v=kTavgAYqmx4)
those 15s are in less than 2.5 cu ft per sub. plays down to low 20's with ease.

RangerDangerV2
12-16-2012, 12:53 PM
Kyle Johnson's Ranger (2) Zv2 15s, Powerbass 5k - YouTube (http://www.youtube.com/watch?v=PLXe1an8U-E)
yet again... less than 3 cu ft.

RangerDangerV2
12-16-2012, 12:55 PM
152.7 on 1980 watts - 2 - 15's Ford Ranger - Kyles ADV 1 Run - YouTube (http://www.youtube.com/watch?v=qMJC87QZHYc)

pro-rabbit
12-16-2012, 01:00 PM
You are a taking a very narrow and specific install and trying to apply that to all installs. We have talked about this before. That is simply not how this works. Let's not forget we are talking different subs and power and desired goals.

RangerDangerV2
12-16-2012, 01:02 PM
You are a taking a very narrow and specific install and trying to apply that to all installs. We have talked about this before. That is simply not how this works.

ive done it, and seen it plenty of times. those are simply the only videos that I could find. small with a good amount of port area works very well. plays flat, gets low. now I have never dealt with aq, so I may be wrong on that, but with every sub that I have used they loved a smaller box with a good amount of port area.

pro-rabbit
12-16-2012, 01:08 PM
There is a balance to be had, but it depends highly on the application, goals, and product. There is simply no way to say this will work for all subs and applications.

Also I did say you will still be able to play low in smaller enclosures and with various port area. However these is a give and take situation when designing.

RangerDangerV2
12-16-2012, 01:11 PM
There is a balance to be had, but it depends highly on the application, goals, and product. There is simply no way to say this will work for all subs and applications.

Also I did say you will still be able to play low in smaller enclosures and with various port area. However these is a give and take situation when designing.
because 6th orders.

mlstrass
12-16-2012, 10:13 PM
ive done it, and seen it plenty of times. those are simply the only videos that I could find. small with a good amount of port area works very well. plays flat, gets low. now I have never dealt with aq, so I may be wrong on that, but with every sub that I have used they loved a smaller box with a good amount of port area.


Then perhaps you should stop giving advice on subs you have NEVER built for :uhoh:

RangerDangerV2
12-16-2012, 10:42 PM
Then perhaps you should stop giving advice on subs you have NEVER built for :uhoh:

ok

SquishY
12-16-2012, 11:46 PM
I've always had good results from the larger boxes we built with lots of port, and even the smaller 2 cube ones with 6" round ports. Post tax time be expecting a build log.
Ran a main power wire yesterday, should be getting to my big three tomorrow. Box for one 15 until the second comes will be around 5.5 cubes with 17" of port per cube iirc. Might even get some videos of that up, should be in next week.