2003 chevy malibu

[pj9788]

my brother in law has to l7 12's and were trying to figure out how to make them louder in the cabin i cannot find a way to drop the seats so what are my options

[Fallen]

What box are they in? What amp are you using?

[pj9788]

i built the box its 4 cubes @ 32.5 hz and a bxi1606d @ 1 ohm running to them

[Fallen]

Hmm with that amp my friends Car gets surprisingly loud with a single 12 albeit it's in a 6th order BP.
IIRC it was up around 130dB with 100Wrms.

Have you taken out the stock 6X9s? that shoulf free up some air flow. How is the box positioned? Subs back port back works well. How much port area is there? Is there room around the box for the air to flow?

[pj9788]

i have replaced the 6 x 9s with mb quartz 6 in mid bass and there is room around he still wanted space back there and the subs are one on top one on the back and port is back im not sure about the area but it is tuned to 32.5 and 3" wide by 15 tall

[Bobinger]

The least expensive but potentially time consuming is to move the enclosure around also. You could also make a port through the rear deck to help with air flow. That option would be more expensive, and take a little time to get everything right. I say drop one of the subs, and go with a single sub. I'm pushing my L7 12" with 1330 RMS on a daily basis, and have poped a 146.9 in a prefab enclosure. Also, my gain is all the way up all of the time. I'm trying to see if I can blow it. It hasn't had any problems for the past 4-5 years that I've had it. Is each sub in it's own dedicated side of the box?

[perfect_prefect]

is there a fold down armrest in the center of the back seat?

[ThaPath]

build a new box. or try doing the port directly into the cabin.

[Darkmage1991]

Originally Posted by Bobinger

I'm pushing my L7 12" with 1330 RMS on a daily basis, and have poped a 146.9 in a prefab enclosure. Also, my gain is all the way up all of the time

i lol'd at that, turning the gains all the way up = fail

[TOXICBREW]

interesting malibu thread, i don't know if this will help you but here it is...

The Super Malibu, 15 Volts, 30hz Tuning, 10's on 3k+! - SMD Forum

[SS Dave]

get Fallen to design you a new box

[fosg8freak]

Originally Posted by darkmage1991

i lol'd at that, turning the gains all the way up = fail

I thought the same but he DID say that he's trying to blow it by cranking the gain... so cant really fault him.

to the OP, I have this sneeky feeling that by having your subs on 2 different planes (meaning one's on the top and ones on the back) you're losing a lot of output and possibly having cancelation issues because of it.

Make a box with both on the same side, that way they have a coupling effect that's good for a good added output.

If you dont mind damaging the Car a little you could cut a little foam out of the seats for easier airflow. Also removing rear speakers for additional flow would be good too.

Is your trunk flexing like a mother fker too?

[Bobinger]

Originally Posted by darkmage1991

i lol'd at that, turning the gains all the way up = fail

I understand that, but I'm trying to test a theory. I want to prove to myself if it's wattage or frequency that will cause failure. I know that I can look at videos all day long on woofer failure with regards to SPL competitions. I'm also trying to prove a point to one of the local shops.

[Kryptonitewhite]

how about some pics to see what youre working with here

[pj9788]

i think im having canccellation issues as well so my only option at this point is to build a new box. so should i do subs back port back or what?

[perfect_prefect]

Originally Posted by Bobinger

I understand that, but I'm trying to test a theory. I want to prove to myself if it's wattage or frequency that will cause failure. I know that I can look at videos all day long on woofer failure with regards to SPL competitions. I'm also trying to prove a point to one of the local shops.

popping the subs has to do with during the clipped portion of the signal it changes from an ac signal to a flat dc signal, this pours constant power through the coil, the sub wasnt designed to disappate heat from a constant flow like that. its designed around an ac signal.

[fosg8freak]

Originally Posted by Bobinger

I understand that, but I'm trying to test a theory. I want to prove to myself if it's wattage or frequency that will cause failure. I know that I can look at videos all day long on woofer failure with regards to SPL competitions. I'm also trying to prove a point to one of the local shops.

neither.

as Perfect said, cranking the gain doesnt really increase your true wattage much but gives you a crap ton of distortion, which in turn is "dirty power" which leads to woofer failure.

when you get a clipped wave, you send power to your sub in a square wave, meaning there's extra power going in the coil that the woofer cant disapate with movement of teh coil, meaning additional power+no additional cooling=overheat and blown woofers.

[ThaPath]

same thing with bass boost

[fosg8freak]

Originally Posted by ThaPath

same thing with bass boost

depending on the bass boost, what other settings and such are at... if you had your bass at -3 and your gain pretty low, you could get away with a +6db bass boost with no clipping, but the thing about bass boost is that it's usually at one frequency and fairly peaky at that freq... badd idea for the most part.

[ThaPath]

exactly.......build a new box and work with the port tuning and placement.

box technique has a lot to with spl and sq, its not just wattage.

[Bobinger]

The way mine is setup right now is my low pass cross over is set to roughly 60hz, normal listening volume is 21 with the woofer turned to -13. If I'm going to run it harder, I'll go to a max of 0 for the woofer. Anymore and I get distortion. The only times I've gone higher have been in a couple of spl competitions that I did. I agree that I have to get a better box, but to get the numbers that I want, WinISD says is going to be a really big enclosure.

[sri3850341]

second time this has been asked.. do you have an armrest??

[perfect_prefect]

Originally Posted by sri3850341

second time this has been asked.. do you have an armrest??

and this is the third if you have an arm rest you can cut out behind it and have your port right there so your box is ported directly into the cabin. ie. just like sri's. very helpful when your seats either dont fold down or you dont care to fold them down all the time.