The 4th order thread

[thatguy12 10+ year member]

and the sucky part is, ive been testing music all day, because I cant find any 0db tones lol, im sure burps will gain me too

Not sure if someone said this yet. You can create your own 0db tones on audacity for any length of time in any format; lose less, mp3 or wav. Sorry if was answered within next pages.

 

[RangerDangerV2 5,000+ posts]

Not sure if someone said this yet. You can create your own 0db tones on audacity for any length of time in any format; lose less, mp3 or wav. Sorry if was answered within next pages.

already have everything I need. thanks though

 

[gumby688 10+ year member]

Ok I am picking up a pair of Sundown z v.3 18's. How do they preform in a 4th order or would I be better off with something else? Will be running approximately 4k to them in a explorer sport 2 door. I have a space of about 48 wide 25 height and 30 depth so right at 20cuft. am trying to stay in cargo area behind rear seats until I can talk my wife into letting me build a wall.

 

[RangerDangerV2 5,000+ posts]

Ok I am picking up a pair of Sundown z v.3 18's. How do they preform in a 4th order or would I be better off with something else? Will be running approximately 4k to them in a explorer sport 2 door. I have a space of about 48 wide 25 height and 30 depth so right at 20cuft. am trying to stay in cargo area behind rear seats until I can talk my wife into letting me build a wall.

read the first few pages, run some numbers and see lol

 

[IonRL205 10+ year member]

Ok I am picking up a pair of Sundown z v.3 18's. How do they preform in a 4th order or would I be better off with something else? Will be running approximately 4k to them in a explorer sport 2 door. I have a space of about 48 wide 25 height and 30 depth so right at 20cuft. am trying to stay in cargo area behind rear seats until I can talk my wife into letting me build a wall.

A friend has two Zv3 18s on a SAZ4500 in a 4th order and he does a 154/155ish

 

[gumby688 10+ year member]

A friend has two Zv3 18s on a SAZ4500 in a 4th order and he does a 154/155ish

Any idea what ratio he is using?

 

[IonRL205 10+ year member]

Any idea what ratio he is using?

No idea, not sure if he knows either lol

he bought the car from the guy on youtube a21bravo. You could ask him what the ratio was

 

[Nut Hair Trick 10+ year member]

I'm thinking about getting 2 SA12's and I ran some numbers for my vehicle. I have 4.52 cubic feet available which is 127.99 l.

So, 27.66 l / 127.99= .21611......+1= 1.21611, square root of that =1.102, x the Fs of the woofer (32.97) comes to an FC of 36.3.

Where do I go from here?

P.S. I got the t/s parameters from what PWK extracted from the sub

 

[RangerDangerV2 5,000+ posts]

I'm thinking about getting 2 SA12's and I ran some numbers for my vehicle. I have 4.52 cubic feet available which is 127.99 l.So, 27.66 l / 127.99= .21611......+1= 1.21611, square root of that =1.102, x the Fs of the woofer (32.97) comes to an FC of 36.3.

Where do I go from here?

P.S. I got the t/s parameters from what PWK extracted from the sub

too low of an Fc IMO. get it to around 45-50

 

[Nut Hair Trick 10+ year member]

Should I have used the whole available space on the equation or broke down the box to a 2:1 ratio, and used the liters from the 1 for the equation?

 

---------- Post added at 10:43 AM ---------- Previous post was at 10:43 AM ----------

 

I used total available space

 

[RangerDangerV2 5,000+ posts]

I'm thinking about getting 2 SA12's and I ran some numbers for my vehicle. I have 4.52 cubic feet available which is 127.99 l.So, 27.66 l / 127.99= .21611......+1= 1.21611, square root of that =1.102, x the Fs of the woofer (32.97) comes to an FC of 36.3.

Where do I go from here?

P.S. I got the t/s parameters from what PWK extracted from the sub

and you are doing that wrong it seems. you divide the vas by the sealed chamber volume, not total volume that you have. but ill make this easy for you. give each of the sa12s 1 cu ft sealed. that is the best for them.

 

[Nut Hair Trick 10+ year member]

Awesome, thanks. Makes sense

 

[OldManBass]

Would Fi SSDs be good in a 4th order?

 

[RangerDangerV2 5,000+ posts]

Would Fi SSDs be good in a 4th order?

run the numbers and see...

 

[Nut Hair Trick 10+ year member]

A true 2:1 ratio of my available space of 127.99 would be 42.66l (1.5 cuft) and gives me an FC of 42.32

If I used 2cuft for the 2 sa12s or 56.63l for the sealed chamber, I get an Fc of 40.22.

The smaller Sealed chamber gave me a higher Fc. I tried it again with both volumes using the T/s parameters on SSA's site and I got much lower FC's 39.6 (42.66l or 1.5 cuft) and 37.155 (56.63l or 2 cuft). I can not access the sundown site because it asks me for a password. The only T/s parameters I can trust right now is that of what Pete extracted. I know this may sound dumb, but would the T/s parameters that I have access to change due to me using (2) D4 Sa12's?