Building a ported box using WinISD

[I Like Waffle]

Im working on building a box for 2 10"s i just picked up. Box will be subs back port back most likely. Box design i have so far is 20" deep, 30" wide, and 12.5" tall, thatll get me the displacement i need for them after port and driver displacement. Going in a trunk car like an accord or something similar. Here are the driver specs

T/S Specs:

FS: 29hz

QMS: 4.68

QES: .33

QTS: .31

VAS (ltrs): 53.96

xmax (1 way): 10mm

Manufacturer reccomends 1.5 cube ported to 50 hz with 2 3" aero ports 13.5 inches long. When i use win ISD to calculate it its telling me i need 2 3 inch ports that are 1.5 inches long to tune to 45. Am i doing something wrong here? I havent got much experience with ported boxed but im gonna tune these 10s a little lower than reccomended to see if i can get some more low end out of them. Box pros chime in?

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[Vermithrax 10+ year member]

Replied in your other thread. 1cf each tuned to 45hz, 4" port 13.47" long. That's one option anyway, but the response looked pretty good with a peak between 50-60 hz.

 

[Vermithrax 10+ year member]

If you want to tune lower, 1cf @ 38hz., 3" port 10.74" long. Showed a much flatter response graph but peak output is 2db less than the 45hz. tuning. The F3 of the 38hz. tuning is around 38hz. while the F3 of the 45hz. tuning is right at 41hz. Of course cabin gain will play it's part in output and response.

 

[I Like Waffle]

will they respond well tuned that low? I dont want them tuned lower than intended and have horrible SQ. Will mostly be played on jeezy songs which are usually around like 40hz right? Ill probably demo the subs on the "welcome back" song by him. Might try to put it up against a few of my friends setups and see if theyre louder. Fs of the sub has alot to do with how low it will play right? Id like to find a detailed explanation of T/S specs so i can figure out how all that works.

 

[I Like Waffle]

Anyone know why my winISD is coming up with wrong calculations?