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Flipx99
09-25-2005, 02:53 AM
I had my car tested for the first time today. I expected much more. I hate 138.8. I was hoping for mid 140s. Not to mention that I blew my subs after the show. One voice coil was busted in pieces and the other had the wires all busted off of it. I think the amp is just too much for it. Anyways, I am still looking to hit 150, my goal.

I figure with an alternator upgrade, battery upgrade, and some subs that 1000 watt RMS, I should be close to 150. I am looking seriously at the type x's but also looking at the strokers. I have no care for SQ. I don't compete but I am only looking for SPL.

Does anyone think with the following upgrades I can hit 150. I know that's a big jump. My friend reccomended 15s but I want to be different and go with 12s.

JimJ
09-25-2005, 02:55 AM
What is your enclosure tuned to?

Do you know what your in-cabin resonant frequency is?

davidfre21
09-25-2005, 02:58 AM
if you hope to hit 150, ur gonna need a whole system over haul

Flipx99
09-25-2005, 03:00 AM
No, but this is what I do know.

Box is tuned to 40 hz because on the graph that came with the sub, that is where peak is.

When I had it tested, it hit peak SPL at 54-55 hz.
- this I don't know why. I set mu subsonic/low pass to 40 hz, my sub hits max spl at 40hz, and my box is tuned to 40hz.

The guy at the mic said my car changes all that. I asked him what I should do. He said, that is why we compete.

SSS 18734
09-25-2005, 03:01 AM
you only hit 138db with a 2000SPL? or two?

what kind of box were they in?

Flipx99
09-25-2005, 03:02 AM
if you hope to hit 150, ur gonna need a whole system over haul


where am I failing?

davidfre21
09-25-2005, 03:03 AM
No, but this is what I do know.

Box is tuned to 40 hz because on the graph that came with the sub, that is where peak is.

When I had it tested, it hit peak SPL at 54-55 hz.
- this I don't know why. I set mu subsonic/low pass to 40 hz, my sub hits max spl at 40hz, and my box is tuned to 40hz.

The guy at the mic said my car changes all that. I asked him what I should do. He said, that is why we compete.
turn your SSF down a tad, no need to set it to exact tuning...

54-55hz is a good thing, usualy the higher the peak the better... unless its a crazy 90hz peak or someshit (ive seen it happen)

Flipx99
09-25-2005, 03:08 AM
so that's pretty good....perhaps a sub with a bit more power handling, couple upgrades and I should be much closer.

davidfre21
09-25-2005, 03:11 AM
i did 150 with 2 15s SPL based and 1500watts

vehicals plays a huge factor also

Flipx99
09-25-2005, 03:16 AM
My best friend said that's a factor, plus my lack of dampening material. I want to stick with 12s because he has 15s. Is it that much more difficult to reach a similar mark with 12s vs. 15s even though my amp is much better than his?

davidfre21
09-25-2005, 03:18 AM
what do you drive?

could be just as easy to hit the same score depending on what he is running, and in what car also

Flipx99
09-25-2005, 03:22 AM
I drive 89 Cutlass Ciera
He drives 94 Dodge Spirit

yes...we spend 2x more on systems that out car is worth.

davidfre21
09-25-2005, 03:23 AM
150 probly aint gonna happen for ya, shoot for 145 :)

Flipx99
09-25-2005, 03:29 AM
What is hurting me? Is it that I don't want to build a wall.

davidfre21
09-25-2005, 03:30 AM
What is hurting me? Is it that I don't want to build a wall.
unless you have lots of time and money it aint gonna happen, a wall would get you that 150 if done right

SSS 18734
09-25-2005, 03:31 AM
maybe start at the most important part, the box? I doubt most competitors build a single box and have it be their best one. If your serious about competing, you might end up building a half dozen boxes before you find something the subs really like.

Flipx99
09-25-2005, 03:33 AM
I have neither really...that's kind of disappointing. Like telling me I have cancer or something. I know your just telling me what me what I need to hear, but I would expect them to hit higher than 138....it just seems like 2 10s and an audiobaun amp to me.

Flipx99
09-25-2005, 03:34 AM
maybe start at the most important part, the box? I doubt most competitors build a single box and have it be their best one. If your serious about competing, you might end up building a half dozen boxes before you find something the subs really like.

I based the tuning of the box on the graph that comes with the subs. It would seem that would be the best frequency to tune the box. Why would it not be?

davidfre21
09-25-2005, 03:47 AM
they are more capable, you just need to set you sights at a more achievable goal. and once you have that you set your sights higher. Gotta start from the bottom and work you way up...

Flipx99
09-25-2005, 03:51 AM
I see. I suppose there is not set formula for why I hit so low. I just should "attack" each area and they will work together to improve spl. Improve alt so I don;t have voltage drops, improve dampening, and improve subs...

I just feel bad because I thought my system was good to go and I wouldn't have to worry with it.

davidfre21
09-25-2005, 03:58 AM
exactly

ngsm13
09-25-2005, 04:05 AM
if you hope to hit 150, ur gonna need a whole system over haul

Exactly.
I did 150++++ with a single 15" ;) :) ;)

NG

Flipx99
09-25-2005, 10:37 PM
But you have a differnt car from me...I am beginning to think a 15 has advantages overs 10s and 12s in SPL comps, but I don't know why.

JimJ
09-25-2005, 10:39 PM
But you have a differnt car from me...I am beginning to think a 15 has advantages overs 10s and 12s in SPL comps, but I don't know why.

More swept area is one...

btnhfan
09-25-2005, 11:33 PM
Mess with the enclosure to see some gains.

I probably built 10+ boxes.


And I messed with all of them too.

TypeRBass
09-26-2005, 12:05 AM
Mess with the enclosure to see some gains.

I probably built 10+ boxes.


And I messed with all of them too.

hell yeah....im only on my third box for my DD's...
150.6 @ 39hz with 2 12's and only 1400 watts of power.....makes me happy, meh. but it took me time to get a 150.....lots of work and building and testing went into it. took me hrmmm...7 months for me to break my 150...if you ahve time and dedication to it you can do it :)

Flipx99
09-26-2005, 12:08 AM
It would be a little easier if I had my own mic. Then I could see the adjustments real- time.

davidfre21
09-26-2005, 02:58 AM
It would be a little easier if I had my own mic. Then I could see the adjustments real- time.
always makes it a little easier...

sometimes the smallest things will also get you gains

for me

Open glove box - +.1
Duct tape front edges of box - +.3
Duct tape around port - +.4
Duct tape back edges of box - -.2
Having an asian guy sit on my windshield - +.1
Seats moved around - +.3 (try different positions)

Bunch of random things :)

Flipx99
09-26-2005, 11:59 AM
But I am curious why those things help/don't help.

I am also curious as to why watts per sub doesn't seem to be as important as quantity and size of sub. Why if I went with 2 12s with 750 watts, it would not create the same spl as 2 15s with 350w each. It seems the 2 12s would create more SPL because they have more power going to them.

davidfre21
09-26-2005, 01:14 PM
i couldnt honestly tell u why i gained, i guess it just effected air flow.

forgot to mention takin out you inline fuse at shows.. +.6 here