First SPL Competition

[hunterw 10+ year member]

hard to say. but usually 6-8 lower then the peak freq. well thas how i play it. there may be a better way

 

[btdickey99 5,000+ posts]

That's what I thought. Now, I just gotta find someone with a Termlab to help me out.
Anybody got an answer for the second part of my question? What tuning should I go with based on my peak frequency? -10? +10? Or is that something I will have to mess around with and figure out what works best?

I would do it 2-3 db off what your car peaks at...unless of course your peaking at something high and still want the box to be used as a dd

 

[hunterw 10+ year member]

what kind of car is it btw? and you kind answered your own question lol. box is tuned to 32, peak was at 42...

 

[thehardknoxlife 10+ year member]

If your an all out SPList....get rid of the carpet.......

 

[jnralp00 10+ year member]

You would actually want to put your sub in a sealed box to find the peak frequency of your car, and go from there. And start tuning from there. If you want to do it right anyways...

 

[BuckyBoy 10+ year member]

I would do it 2-3 db off what your car peaks at...unless of course your peaking at something high and still want the box to be used as a dd

I'm going to use the box in the pictures for my daily driver box and a higher tuned box for competitions if my peak frequency is high.

what kind of car is it btw? and you kind answered your own question lol. box is tuned to 32, peak was at 42...

2000 Mitsubishi Eclipse GT

The 42 was just throwing a number out as an example. I haven't had a sweep done yet.

If your an all out SPList....get rid of the carpet.......

Why do you say that? The box in my pictures will be my daily driver box tho, but for a comp box I will go bare box if there is actually a reason to. Never heard of that tho.

 

[BuckyBoy 10+ year member]

You would actually want to put your sub in a sealed box to find the peak frequency of your car, and go from there. And start tuning from there. If you want to do it right anyways...

haha didn't know that either, but I do want to do it right. If I can find someone to do the sweep for me before the next competition then I will throw together a sealed box for it. Thanks

 

[hunterw 10+ year member]

ahhh i see. i think it would be louder on the meter with the sub and port firing forward....

carpet hurts spl scores. id do a lot mot to thazt box if it was spl, bigger port, 45 the corners,resin it, double up all the sides, basically make it as rigid and as fast as possible if that make sense... there are a lot of things to find out through mutiple box builds. if your into it all crazy like lol. bolting the box down helps too, and having it fit completely snug from wheel well to wheel well

 

[btdickey99 5,000+ posts]

ahhh i see. i think it would be louder on the meter with the sub and port firing forward....
carpet hurts spl scores. id do a lot mot to thazt box if it was spl, bigger port, 45 the corners,resin it, double up all the sides, basically make it as rigid and as fast as possible if that make sense... there are a lot of things to find out through mutiple box builds. if your into it all crazy like lol. bolting the box down helps too, and having it fit completely snug from wheel well to wheel well

I strongly disagree with that unless it was totally sealed off...I think either sub up port up, or sub back port back

And as far as the carpet thing....thats news to me?

how do you figure?

 

[BuckyBoy 10+ year member]

ahhh i see. i think it would be louder on the meter with the sub and port firing forward....
carpet hurts spl scores. id do a lot mot to thazt box if it was spl, bigger port, 45 the corners,resin it, double up all the sides, basically make it as rigid and as fast as possible if that make sense... there are a lot of things to find out through mutiple box builds. if your into it all crazy like lol. bolting the box down helps too, and having it fit completely snug from wheel well to wheel well

The front is doubled. 45s in every corner. I won't be carpet on my competition box.

What kind of port area you thinking? That box is 2.5ft^3 and has 31.25 square inches. Bump it up to around 40?

I doubt I will resin it, but I might. I seal them up really well. I will also design the comp box to fit wheel well to wheel well.

Thanks for all the advice keep it coming.

What you guys think I can meter if I do all this with a test tone at peak freq? The winner from the last competition in Street One was 146 something.

 

[BuckyBoy 10+ year member]

I strongly disagree with that unless it was totally sealed off...I think either sub up port up, or sub back port back
And as far as the carpet thing....thats news to me?

how do you figure?

I was thinking sub up port back as well, but I tried to design a box like that last time and just couldn't get it how I wanted with my hatch dimensions.

 

[jnralp00 10+ year member]

I strongly disagree with that unless it was totally sealed off...I think either sub up port up, or sub back port back
And as far as the carpet thing....thats news to me?

how do you figure?

^^ X2.. Actually in a hatch like yours, could do better off axis, firing up. Hard to say though just have to try.

 

[hunterw 10+ year member]

well in most small odd hatches that i have played with there was a 2db gain by firing the ports and subs forward........tibs,cougars, etc.

as far as the carpet, i dont know why exactly it just does...think of spl like the continuim transfunctioner.....

 

[btdickey99 5,000+ posts]

yea unless you completely seal the cabin off, I think its a bad idea for sub and port forward

 

[hunterw 10+ year member]

you just have to test. test and test a lot more.