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  #1  
Old 11-12-2012, 04:12 PM
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Lightbulb modeling software vs in car results (clamp thown into the mix)

I built a box that is 3.336 cuft tuned to 43.51hz(according to winisd) with a 6in PSP ports

My car peaks at 44hz and this was a comp box.

Here is a look at the box





In car
Box is 5inches away from back.




I decide to whip out the clamp and meter to see what the amp is putting out. Test it at 44hz.

Here is what I get:
64.2 volts and 34amps
2182 watts at 1.88 ohms
at 11.8volts



Rising to 1.88 ohm seemed a little high to me. So I whipped out my laptop and my woofer tester2.

I ran a box test and this is what I got.



In my car the box is tuned to 34.5hz(FM on WT2)
Of course the box being 5in away from the back wall affected the tuning.

I clamped at 44hz and guess what WT2 gives me, an impedance 1.86ohm as can be seen on the graph. So the impedance plot from WT2 was quite accurate. I have been told that compression and coil temperature come into play when giving the sub real power vs the small signal from the WT2. It can affect the correlation between the two. Although in my test that was proved other wise. Perhaps its a case to case thing.


Most people would have been playing with the port length taking hours of work in order to get the max spl possible. With the WT2 that cost me $75 I can see what is going on make educated adjustments.


Makes you wonder, what is really going on with your sub/box in your car?
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Old 11-12-2012, 04:26 PM
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Thats good learning right there. Most people to think about what the box program is telling them. Basicly info based in a open air environment! Far from what happens in a car.
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Old 11-12-2012, 04:44 PM
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Originally Posted by PureDynamics View Post
Thats good learning right there. Most people to think about what the box program is telling them. Basicly info based in a open air environment! Far from what happens in a car.
Exactly. Im not saying that winisd is trash, its a good starting point for sure. But its not the final truth. With car being so unpredictable, the only way to know for sure is having the right tools.
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Old 11-12-2012, 05:19 PM
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If your car peaks at 44 hz, and it's saying that it's tuned to 35, chopping 10 hz off the port should gain you big time. I have the dats program and love it. Any termlab scores to go along with this?

Also when you talked about how close it was and how it affects tuning, made me think and now I wonder if you are able to push it back a couple inches, what tuning/ohms load it would change to. Hmm...Either way, love seeing tests like this.
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Old 11-12-2012, 06:13 PM
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Originally Posted by davecubs14 View Post
If your car peaks at 44 hz, and it's saying that it's tuned to 35, chopping 10 hz off the port should gain you big time. I have the dats program and love it. Any termlab scores to go along with this?

Also when you talked about how close it was and how it affects tuning, made me think and now I wonder if you are able to push it back a couple inches, what tuning/ohms load it would change to. Hmm...Either way, love seeing tests like this.
Yes, hopefully it will.

144.9 in the kick driver door open. (usaci style)

I have a true trunk car with a gas tank in between the trunk and interior.

The box is pushed back as far as possible

Thanks, me too.
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Old 11-12-2012, 09:05 PM
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Originally Posted by BKNIGHTS View Post
Yes, hopefully it will.

144.9 in the kick driver door open. (usaci style)

I have a true trunk car with a gas tank in between the trunk and interior.

The box is pushed back as far as possible

Thanks, me too.
Oh dang, that's not half bad. Good luck and keep us posted! Are you gonna chop a ton off at once or do an inch and retest?
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Old 11-13-2012, 05:25 AM
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Lol told u guys. Wt3 ftw
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Old 11-13-2012, 10:16 PM
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Lol hack, I never doubted it!
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Old 11-13-2012, 10:31 PM
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can you test the box outside of the car and check tuning? I would be interested to see if that is accurate to winisd.
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Old 11-13-2012, 10:51 PM
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good read man.
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