winisd

Don't fret, I've been at it off and on for a few years and am still struggling...

Znom is normally corrected by the user.  I am sure that I probably corrected it to 4 ohms.  The program just looks at Re and multiplies by 1.3 and spits out the most likely common impedance based on that math (at least I think that's how it goes).  It's not important at all, just there for database info.

Le and Pe are 0 on yours because you didn't enter anything into the fields.  Pe is nominal power handling, and there again, is there for nothing more than informational purposes in your driver's database.  Le is a parameter that may or may not be given for car audio subwoofers.  When it IS given, enter it into the field.  It helps determine the high portion of the frequency spectrum so that the line curves not only on the left (lower freqs), but also on the right.  It helps mostly with determining the best crossover to the mid driver...something that is not often used when designing a sub enclosure. 

I got all the parameters from the website, so I must have gotten that as well.  WinISD cannot calculate either Pe or Le from other parameters.  You can, though, successfully design the box without either of them.  Enter power input under the signal tab for determining excursion.  Power input is the power from the amplifier at RMS, not the sub's power handling capability.

Hey again, went ahead and built a new box today, 2 ft^3 @ 29 hz. Guess time will tell if this will be better than the first box. I checked the websites specs again and did not see an Le, but they have a Ls, maybe a typo? Anyways, figure a day or two before I will get to try it out so I will post what kinda results I get with it. All else fails, I still have the first box, and as a last resort, when fundage comes around could always just go with a different sub, but that is a Last resort!

And to Haem, I saw your post on the TC forums, did you see Kyle's response to what you asked? Curious if that answer did you any good or not.

Ls is Le when the coils are wired in series.  Much of the time, a DVC sub is wired to series before specs are measured.  If Ls is the only "L" parameter given, this gives you a clue that all parameters given are with the coils in series.

haemph, let us know how close you measure to the published specs.

Hey let us know how that new box compares with the old one.  I've got two rl-p 15's at 3 ft^3 each @ 28 hz so I'm curious to see how you like yours tuned lower.  By the way it's not surprising the 20 hz tones rumble your vehicle with little sound output because the human ear is far from sensitive at that low of frequency.  But hey you're sub is hitting some real lows...and with some lower tuning it should be even better.  Not sure that will help your upper frequencies though.

Check out the soundsplinter page at soundsolutionsaudio.com if you have some more questions.  The guys over there have a good bit of experience and knowledge with these subs.

Program accuracy or user accuracy??