Originally posted by Unity_Jon@Mar 14 2005, 11:49 AM
I have a pair of Infinity 1030 10" subs and i have the 'spec sheet' with all the tech specs and also a sealed box volume including driver displacement, the image shows a box with a fluch mounted sub with a vbox= 0.75ft3 or 21.24litres.

Great i thought but i ran the specs through bass box pro 6 running them at 2ohmn and clicked on 'optimum sealed box' and it gave me a box design of 6 litres  initially!? the graphs were reasonable but not best, i played with the dimensions of the box and got a much better looking set of graphs when i got slightly smaller than my max space (max space L=31" x H=13"x D=12")

Why is the manufacturers specs so crap and far out or am i missing something ? does anyone have 'winisd' to try and see if the same happens ?

the specs can be found here:
http://www.infinitysystems.com/caraudio/im...x_parameter.gif

would be very grateful of some assistance on this, either on here or via PM

thanks

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It's not the manufacturers specs thats crap, its WinISD.

 

Originally posted by ibanender@Mar 14 2005, 10:04 PM
It's not the manufacturers specs thats crap, its WinISD.

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As well as bass box pro 6...

 

i'm glade i've never heard of these programs to currupt my way of thinking when building a box.

 

so whats the deal, forget the programs and go with the data sheet and assume its all ok ?

the software must have a lot of thought and process in it, is it really that bad after all its just physics right ?

Perhaps i should just build a big ol' box that fits nicely ??

why, in your opinions is the software bad ? if i can understand that i can get my arse into gear.

 

Originally posted by Unity_Jon@Mar 15 2005, 05:09 AM
so whats the deal, forget the programs and go with the data sheet and assume its all ok ?

the software must have a lot of thought and process in it, is it really that bad after all its just physics right  ?

Perhaps i should just build a big ol' box that fits nicely ??

why, in your opinions is the software bad ? if i can understand that i can get my arse into gear.

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The software doesn't go off of physics, it goes off of numbers you put in. It makes calculations based on those numbers. Those number don't mean shit to physics, which is what the real box is. I've seen those programs recommend a 0.2 cu. ft. ported box for a 15. The sub wouldn't fit in that box. I've also seen it recommend 24 cu. ft. sealed for a 15. Use the manufacturer data sheet, they provide it for a reason.

 

.65ft^3 - .80ft^3 is perfect for the 1030w's ..

 

Originally posted by bRad_geeZee101@Mar 15 2005, 09:38 AM
.65ft^3 - .80ft^3 is perfect for the 1030w's ..

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sealed im presuming

 

i had winisd tell me i needed like 5 cubes sealed for my XXX 12"....and that curve wasn't hardly different then 1 cube sealed either.

 

thanks for the help guys, i'm going to go with a pair of vented enclosures to the manuf specs and move the back seat inwards to accomodate them and run the vents up through the parcel shelf into the car.

Well, if you gonna do something.....

 

well i decided not to give in with the software and spent some time with it, i decided if the manuf. specs were/are spot on, i should be able to reproduce the graphs they supply to and after time i managed to duplicate it and now have a much much better understanding of how the software works shit out.


With that i managed to tailor the box slightly to give a design that suits my needs more with a better smoother graph.

I'll have a go with this and see, if its no good i'll build another

 

wanna know a lil secret?


when a company gives out min and max box size rec's, ever wonder how big of an area that those specs are designed for? the bigger the "room" is, the bigger the box should be for proper acoustics, aiming is another factor in it, you can't expect a box to be loud just because you made it to manufacturer specs, theres alot of factors those manf. specs don't take into account (i.e. size of "room", direction sub is being fired, space between sub and nearest object sound waves encounter).

 

Originally posted by draarong2004@Mar 17 2005, 06:02 AM
wanna know a lil secret?
when a company gives out min and max box size rec's, ever wonder how big of an area that those specs are designed for? the bigger the "room" is, the bigger the box should be for proper acoustics, aiming is another factor in it, you can't expect a box to be loud just because you made it to manufacturer specs, theres alot of factors those manf. specs don't take into account (i.e. size of "room", direction sub is being fired, space between sub and nearest object sound waves encounter).

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What he's saying is, the graphs are in conditions in an anechoic chamber. That isn't your car. You can graph it all day long, but if you RTA the car it will be TOTALLY different, especially on low end response.

 

and thats why you TEST TEST TEST TEST all day long, till you have the perfect setup, wheather your going for spl or sql.

 

just call the manf. tech line they can help u tune the box the way you want insted of a genral rule of thumb

 

Originally posted by maniak2005@Mar 17 2005, 02:10 PM
just call the manf. tech line they can help u tune the box the way you want insted of a genral rule of thumb

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no, they can't, because their tuning won't be for what car your putting it in, they are just gonna tell you how to tun a box to itself, just because a box is tuned to 35hz, doesnt mean its going to peak at 35 hz, sadly there are some things in life that aren't a phone call away, and this is one of them, sorry.

 

true to a point and tuning the box to the car involves alot of math and right now i can't remmeber what it is. but jl has never got it wrong, because they have always asked me what car is it going in

 

Originally posted by maniak2005@Mar 17 2005, 11:34 PM
true to a point and tuning the box to the car involves alot of math and right now i can't remmeber what it is. but jl has never got it wrong, because they have always asked me what car is it going in

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so, what type of math is it that you use when designing a box?

this question is for maniak only

 

Originally posted by maniak2005@Mar 18 2005, 12:34 AM
true to a point and tuning the box to the car involves alot of math and right now i can't remmeber what it is. but jl has never got it wrong, because they have always asked me what car is it going in

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It's not a lot of math, its a lot of knowledge. There is no math that says "this car will peak this way so you couter-act it with a box tuned this way in this volume". They ask you what car its going in for the volume of the box.