Tuning advice

[tburt915 0]

I see that there are a shit ton of abreviations for specs about subs. for example:

fs

qms

qes

qts

mms

cms

sd

vas

spl

bl

 

My question is, when designing a box are there any one of these numbers i should pay attension to when deciding volume and tuning?

 

    -Thanks 

[khinds94 17]

Personally, The only number that helps me when designing a box is the fs. If the fs is high like 40-45 hz, usually its better to tune higher.

[tburt915 0]

i was looking at a sub with a fs of 30 so i was going to tune the box to 30 hz. i had a sub with a fs of 40 and i tuned its box to 34hz and it just does not like lows

[lithium 358]

thats not how subs work.. the list of specs there are called thiele small parameters.  to design a proper enclosure you, or a program like winisd, takes all of those parameters into account and models the subwoofer and enclosure. 

[lithium 358]

Personally, The only number that helps me when designing a box is the fs. If the fs is high like 40-45 hz, usually its better to tune higher.

 

[khinds94 17]

Personally, The only number that helps me when designing a box is the fs. If the fs is high like 40-45 hz, usually its better to tune higher.

 

Am I way off?

[lithium 358]

 

Personally, The only number that helps me when designing a box is the fs. If the fs is high like 40-45 hz, usually its better to tune higher.

 

Am I way off?

i don't understand where you got that idea from. how did you go about determining the other enclosure specs? 

[khinds94 17]

 

 

Personally, The only number that helps me when designing a box is the fs. If the fs is high like 40-45 hz, usually its better to tune higher.

 

Am I way off?

i don't understand where you got that idea from. how did you go about determining the other enclosure specs? 

I figured that you use the recommended enclosure size from what the manufacturer gives, and then you tune the box with the fs depending on whether it is higher or lower.

Edited September 15, 2013 by khinds94

[tburt915 0]

Fs: 30.1 Hz

Re: 0.7 Ohms/coil

Qms: 7.65

Qes: .37

Qts: .36

Mms: 248g

Cms: 0.11mm/N

Sd: 480cm^2

Vas: 36.5 l

Spl: 86.1dB 1W/1m

Bl: 13.1

Xmax: 20mm

Rms: 1000W

Sealed box: .7-1.2 cuft

Ported box: 1.8-2.5 cuft @ 33Hz

Sub OD: 12.500”

Cut ID: 11.125”

Mounting depth: 6.500”

Displacement: 0.14cuft

this is the parameters. I plan on putting 2 12in fi ssds in an aero ported box. if anyone could help me out that would be greatly appreciated!

Edited September 16, 2013 by tburt915

[///M5 2,833]

Personally, The only number that helps me when designing a box is the fs. If the fs is high like 40-45 hz, usually its better to tune higher.

 

Am I way off?

i don't understand where you got that idea from. how did you go about determining the other enclosure specs?

I figured that you use the recommended enclosure size from what the manufacturer gives, and then you tune the box with the fs depending on whether it is higher or lower.

NO. One single specification tells you NOTHING about a driver. There is a reason that Thiele & Small have a list of parameters. They ALL need to be accounted for to design a reasonable box. As for following the manufacturers recommendations that is generally the best idea if you don't intrinsically understand ALL of the parameters. Just don't go changing the tuning though either-follow the recommendations completely.

[khinds94 17]

 

 

 

 

Personally, The only number that helps me when designing a box is the fs. If the fs is high like 40-45 hz, usually its better to tune higher.

 

 

Am I way off?

 

i don't understand where you got that idea from. how did you go about determining the other enclosure specs?

 

I figured that you use the recommended enclosure size from what the manufacturer gives, and then you tune the box with the fs depending on whether it is higher or lower.

 

NO. One single specification tells you NOTHING about a driver. There is a reason that Thiele & Small have a list of parameters. They ALL need to be accounted for to design a reasonable box. As for following the manufacturers recommendations that is generally the best idea if you don't intrinsically understand ALL of the parameters. Just don't go changing the tuning though either-follow the recommendations completely.

Oh ok thanks for the info

[lithium 358]

what are the max dimensions available that the enclosure can use?

[tburt915 0]

30W 15H any depth. box will be for two 12in fi ssds powered by a sundown saz1500

[bassahaulic 155]

I've honestly never paid attention the the T/S parameters, and all my custom enclosures sound amazing and get plenty loud. 

It just comes with experience. 

[Christopher Flint 0]

yeah they can help