Help put two 15s in a Blazer, keep back seat.

[SquishY 10+ year member]

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?

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[Kangaroux 5,000+ posts]

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 damn near the same results

 

[mylows10 5,000+ posts]

wont work ,the port noise would be really bad ,do a slot port in the middle of the back of the box

 

[SquishY 10+ year member]

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 5,000+ posts]

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 10+ year member]

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 10+ year member]

Made the box and little taller, got 9.56 gross cubes and 7 after a 7x21.5 port tuned to 33hz.

 

[mlstrass 5,000+ posts]

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 10+ year member]

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

+1

 

[Falcons 5,000+ posts]

There is plenty of room for two 15's in a 2 door blazer. My dad has one.

 

[RangerDangerV2 5,000+ posts]

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 5,000+ posts]

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 5,000+ posts]

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 5,000+ posts]

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 5,000+ posts]

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".