MAZZASEC Another new build thread!

[01 S 10 10+ year member]

its all in the box... anything is possible... BTW my amp was at 1ohm with a rise to around 2.2 last time i checked it

how fast does impedance rise take in effect? My MM4000 is wired to 2.1, so after rise its probably 3 or 4 ohms since my wall is 9cf net. im assuming it increases when the volume increases?

Eventually i want to find subs that give me a final load between 1 and 1.4ohm, so with rise i should be just over 2 ohms (where the amp is "stable")

 

[Skip01 5,000+ posts]

And mobieous fibs.....he knows i need video proof before i believe what he did as a number

Youll see when you get these 4 12s in how loud 152 legal is

 

[skadude016 5,000+ posts]

how fast does impedance rise take in effect? My MM4000 is wired to 2.1, so after rise its probably 3 or 4 ohms since my wall is 9cf net. im assuming it increases when the volume increases?
Eventually i want to find subs that give me a final load between 1 and 1.4ohm, so with rise i should be just over 2 ohms (where the amp is "stable")

oddly enough I have found with a smaller box the more impedance rise I had

 

[iamamp3pimp 5,000+ posts]

thats how it goes

\

larger box, less impedance rise

smaller box, more rise, sharper curve

 

[mobeious 10+ year member]

skip do u have a vid of u doin 154?

 

[iamamp3pimp 5,000+ posts]

i have a vid of me doing a 154.4

somewhere

maybe not, but that was my beginning bassboxing score

(I know, it doesnt count)..lol

 

[Immacomputer 10+ year member]

thats how it goes\

larger box, less impedance rise

smaller box, more rise, sharper curve

That's not really true. In a ported system, there will be two different spikes. Their relative peaks will be determined by the tuning frequency. Their distance away from the tuning frequency (in Hz) will be dependent on enclosure volume. The smaller the box, the further away the spikes occur from the tuning frequency and the larger the box, the closer they are to each other and the tuning frequency.

It makes sense if you think about it. The impedance spikes are due to system resonances. If you make a box larger, or lower the spring force, resonance will happen at a lower frequency. Think about IB systems too. In a first order system like IB, there is only one impedance spike that will occur around the Fs of the driver. If you take a ported enclosure and make it infinitely large, you will have an IB system with only one resonance (port tuning) as the two peaks will converge.

 

[Skip01 5,000+ posts]

skip do u have a vid of u doin 154?

Nope //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

Got USACI record for Louisiana with a 156.1 though on the net //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[mobeious 10+ year member]

booo usaci doesnt count

 

[Skip01 5,000+ posts]

booo usaci doesnt count

ha, do the math...you were down 1db from kick to legal......so im in 155s legal, which i prolly coulda got if i cared to test more at legal

But no reason when DB drag never comes down to me

 

[mazzasec 5,000+ posts]

Ya do our Explorers do the same in the kick as sealed on the dash?

 

[Skip01 5,000+ posts]

Ya do our Explorers do the same in the kick as sealed on the dash?

No cars do

Idk how any of you meter outlaw, but i do it sealed up in the drivers kick....loudest for me when i tested

But my legal from kick is usually down about 1.5ish

 

[mazzasec 5,000+ posts]

Got the other 2 12"s today. //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

 

[iamamp3pimp 5,000+ posts]

time to go back to the lab then isnt it.

 

[mazzasec 5,000+ posts]

time to go back to the lab then isnt it.

LOL Almost. Now just awaiting a box and batteries then everything will be a go //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif