Box size from specs?

[silvercookie 5,000+ posts]

With these specs, can someone determine what a optimal cu ft box it would need?

this is all i could find.

it is for powerbase xtreme series 8"

Sensitivity (1W / 1M): 85.2 dB

Fs: 42Hz / Vas (Liters): 12.0

Qts: .47

Click to read more...

 

[silvercookie 5,000+ posts]

Definition of vas = "Equivalent volume of compliance", this is a volume of air whose compliance is the same as a driver's acoustical compliance Cms (q.v.), in cubic meters. "Vas represents the volume of air that when compressed to one cubic meter exerts the same force as the compliance (Cms) of the suspension in a particular speaker. Vas is one of the trickiest parameters to measure because air pressure changes relative to humidity and temperature — a precisely controlled lab environment is essential. Cms is measured in meters per Newton. Cms is the force exerted by the mechanical suspension of the speaker. It is simply a measurement of its stiffness

does that mean if vas = .47 i can use the box in .47 cuft?

 

[stangman67 10+ year member]

Nope not at all lol. Do you have all the t/s specs on it?

 

[silvercookie 5,000+ posts]

Nope not at all lol. Do you have all the t/s specs on it?

thats all i can find.

i dont know what happened to my user manual.

im still trying to find the rest of the specs.

 

[CHEMMINS 10+ year member]

Need more than that for spec'n boxes.

 

[silvercookie 5,000+ posts]

Ok well good news.

i found box specs.

Sealed optimum .45, small .35, large .75, optimum ported 1.2 tuned to 35, small .75 tuned to 32. 200 rms.

now if i wanted to run a aero port.

could i use .45 and use a aeroport or would i still need a minimum of .75?

 

[stangman67 10+ year member]

I'd go right down the middle with 1 cube at 35hz. Port will be pretty long though. Might have to go slot port or external aero

 

[silvercookie 5,000+ posts]

1 cube for both 8's?

well right now my aero is either 3x9 or 3x11 cant remember exactly and my box is ~32 inches long.

 

[silvercookie 5,000+ posts]

according to the12volt.com box calculator, a 23wx10hx10l box would give me 1.031 cubes.

basically all i have to do is cut 11" off my current box and put another baffle on it. then just either cut down or buy a new piece of pvc for a aero port.

 

[stangman67 10+ year member]

You never said you had 2. I nthe op is says for xtreme 8. I figured 1. So do 2 at 1.5 cubes at 35hz. I have a 1.5 at 35hz box for 2 8's if you are interested.

 

[silvercookie 5,000+ posts]

i already have a 1.5 cube box tuned to 32 hz.

and i have all my equipment in my sig.

 

[stangman67 10+ year member]

Just shave off a bit of the port then. And you are set

 

[silvercookie 5,000+ posts]

what do you mean?

im not asking about port tuning, im asking about box size.

did you even read anything besides the first post?

 

[stangman67 10+ year member]

Yes I did. I think you need to be more clear on what exactly you are asking. You asked for ideal box size, the manual tells you ideal box size. ???

 

[silvercookie 5,000+ posts]

Yes I did. I think you need to be more clear on what exactly you are asking. You asked for ideal box size, the manual tells you ideal box size. ???

Once again did you read what i wrote?

im asking about box size and you are telling me to shave off the port?