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View Full Version : what does this graph mean???



RangerDangerV2
04-14-2012, 09:04 PM
please interperet...

26531891

wenn_du_weinst
04-14-2012, 09:08 PM
that an apxx 18'' will peak out bad around 40hz when the box is sitting in your driveway.

NutHugger
04-14-2012, 09:08 PM
please interperet...

26531891

The box is tuned at about 34hz and peaks at 37hz. It's not the flattest response I've ever seen.

RangerDangerV2
04-14-2012, 09:08 PM
is this a poor design then???

pro-rabbit
04-14-2012, 09:09 PM
does not mean all that much lol

RangerDangerV2
04-14-2012, 09:10 PM
does not mean all that much lol

wut??

pro-rabbit
04-14-2012, 09:12 PM
That only shows a graph of what that enclosure will do outside in the "open air" and not actually in the car.

wenn_du_weinst
04-14-2012, 09:12 PM
wut?? it shows you what will happen with your box NOT inside of a car. So basically it's pointless because it will be much different in car.

RangerDangerV2
04-14-2012, 09:14 PM
so win isd is pointless???

wenn_du_weinst
04-14-2012, 09:19 PM
pretty much, not to mention your t/s are taken at 1watt on an unbroken in subwoofer and change dramatically when more power is ran to the sub.

RangerDangerV2
04-14-2012, 09:22 PM
i see... and considering the fact that I took the ts parameters from a stock apxx 18 and my apxx has a larger vc, more bl, and 4 spiders I am pretty sure that the plot would change quite a bit...

Kangaroux
04-14-2012, 09:25 PM
The only thing WinISD is good for IMO is playing around with the volume and tuning to see what effects what when it comes to a design..i.e. shrink the box volume and the response will flatten out, raise it and it will become peakier, etc.

Falcons
04-14-2012, 09:26 PM
thats how box designers make their money. if it were as easy as typing something into a computer, everyone would be loud :)

TaylorFade
04-14-2012, 09:36 PM
I tried WinISD last night. It told me .14cf tuned to 66.7hz for an Fi BTL N2 12.

Calculators are teh ghey.

RangerDangerV2
04-14-2012, 09:51 PM
well does 5.75 cu ft net with four 4"x18" aeros for my apxx 18 on an saz 3500 sound decent???

kushy_dreams
04-14-2012, 10:02 PM
2 6inch aeros would be better.

This is the difference between actual response on top and win isd on the bottom. The reading on top came from an excel chart I made from readings taken at just over 60% volume playing test tones from 20-65hz with a 10-15sec average spl reading. The box is tuned at 31.4hz. Note how the peaks are drastically different.

http://img192.imageshack.us/img192/379/freqresponse.jpg

Mitch86
04-14-2012, 10:09 PM
I tried WinISD last night. It told me .14cf tuned to 66.7hz for an Fi BTL N2 12.

Calculators are teh ghey.

That be knockin yo! :laugh:

RangerDangerV2
04-14-2012, 10:12 PM
2 6inch aeros would be better.

This is the difference between actual response on top and win isd on the bottom. The reading on top came from an excel chart I made from readings taken at just over 60% volume playing test tones from 20-65hz with a 10-15sec average spl reading. The box is tuned at 31.4hz. Note how the peaks are drastically different.

http://img192.imageshack.us/img192/379/freqresponse.jpg

meh... I already ordered the 4 inch aeros and I dont think that the difference would even be audible.... correct me if im wrong.