Did my box design fail me?

[phemps 10+ year member]

ok so a little background. The car is a 2007 chevy impala. I had an AQ hdc4 18 in the trunk in a box i thought to be not quite optimal, (it was just a temporary setup until i picked up something else) the box was ported to the rear with the 18 facing up. It got pretty nasty but from what i had heard sub and port back in this vehicle is the loudest configuration. Enter 2 tantric HDD 12s that i picked up and the new box i made for them. I figured given that the 12s wouldnt have much less cone area, more motor force, and heat disapation, as well as being able to do port and sub back i would be at least as loud as the 18. Well i am not satisfied with the reults in both loudness as well as sound quality/ response. Its loud but not nearly as loud as the AQ was and although it sounds slightly better its still sounds pretty sloppy and to me it almost sounds like the box is too big and the subs want to unload. I shot for 5 cubes net, 15 sq inches of port tuned to about 34. According to my math I ended up just a bit over 5 cubes and tuning should be correct. Any ideas or input on this would be great, i will upload some pictures of the box as well as dimensions when i can

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[phemps 10+ year member]

 

---------- Post added at 02:24 AM ---------- Previous post was at 02:23 AM ----------

 

 

[phemps 10+ year member]

@NASTY08IMPALA; you have this car, any insight? also do you know how close the box to the trunk lid works the best in here?

 

[Boomsday 10+ year member]

How much power?? I have played with a few HDDs and they like pretty small boxes

 

[NASTY08IMPALA 5,000+ posts]

[quote name='phemps']@NASTY08IMPALA; you have this car, any insight? also do you know how close the box to the trunk lid works the best in here?[/QUOTE]

That port looks a lil big to be 15" per cube ..and yea u have it to far from the trunk...4-6" works best ..other than the port being odd looking the box looks fine..play with the box placement and see if it helps

 

[phemps 10+ year member]

How much power?? I have played with a few HDDs and they like pretty small boxes

Crescendo bc3500 nominal impedence of a half ohm. I plan on strapping another 3500 eventually so ill probably have to go smaller anyway, but i was recomended around this size

 

[NASTY08IMPALA 5,000+ posts]

Crescendo bc3500 nominal impedence of a half ohm. I plan on strapping another 3500 eventually so ill probably have to go smaller anyway, but i was recomended around this size

That box size is fine ive seen many perform well in that size

 

[phemps 10+ year member]

That port looks a lil big to be 15" per cube ..and yea u have it to far from the trunk...4-6" works best ..other than the port being odd looking the box looks fine..play with the box placement and see if it helps

I figured it would be better farther back, it was just how i had to have it with my wiring as is. The port is 6x12.5 so im at about 15 sq in per cube

 

[phemps 10+ year member]

That box size is fine ive seen many perform well in that size

I have the base model and my seats dont fold down, i cut out a large hole in the rear deck and im wondering if thats why the sub up port back 18 setup got so loud

 

[NASTY08IMPALA 5,000+ posts]

Oh ur seats dont fold ..uber gay

 

[brian84corvette 10+ year member]

i love large cone woofers. now that ive had a few 18s id never want to install anything smaller

daily driving playing at 50 t0 60% total volume capacity i realy enjoy the effortless quality sounding bass coming from large cone subwoofers

i cant wait till i finaly get some 21s or 24s to mess with

 

[phemps 10+ year member]

Oh ur seats dont fold ..uber gay

yeaa i figured if cut out the rear deck and fiberglassed a new one with the middle as acoustically transparent cloth that would help out with that alot.

 

[phemps 10+ year member]

i love large cone woofers. now that ive had a few 18s id never want to install anything smallerdaily driving playing at 50 t0 60% total volume capacity i realy enjoy the effortless quality sounding bass coming from large cone subwoofers

i cant wait till i finaly get some 21s or 24s to mess with

I don't think ive ever preferred a single large cone sub over multiple smaller ones of similar cone area

 

[72Impala 10+ year member]

I always prefer large cone woofers as well. I have never really heard a 2 12's setup I like as much as a single 18", but that's just me. Oh and I have played wit A LOT of different woofers of all makes/models and sizes. I almost always shoot for the bigger drivers, they seem to have more of a "Command" presence where the multiple smaller drivers seem to have to work very hard to equate to the larger subwoofers.

 

[hispls 5,000+ posts]

How long is that port supposed to be? You do realize that effectively it extends about to where the paint ends on the back wall right?