or Connect
AVS › AVS Forum › Audio › DIY Speakers and Subs › Custom PSI 12" sub build ideas
New Posts  All Forums:Forum Nav:

Custom PSI 12" sub build ideas - Page 2

post #31 of 45
Thread Starter 
these are the parameters on the other project. This is being pushed by 500w. The xmax on modeling shows it to be well within spec of the excusion at the 500w. I only am pushing about 200w and run into the xmax/xmech issue.
post #32 of 45
In the eq filter section add in that 20 hertz boost of 5 db. then look at the woofer excursion portion and see.

I cant use WinISD at work but I can use Unibox. and I am using a base dual PR with 900g on each for a tune of 27 hertz. So please if I have my numbers not even close, let me know!! biggrin.gif

Anyway, I am seeing with 200 watts the woofer doing 13mm of excursion at 20 hertz. WITHOUT the 5 db of boost. So unless my tuning is way off due to a oops on my part, that 5db is gonna add a bunch of extra excursion.
post #33 of 45
Thread Starter 
I have tried the adjustments again. i have 1200gr to each pr. net box volume was 2.4 cube. at that with putting 300w on the model i am showing an excursion of just below 16mm. which should be in spec. if you get a chance tonight take a look and let me know what your showing.
post #34 of 45
Thread Starter 
that setup shows i am tuning to around 16hz
post #35 of 45
Thread Starter 
post #36 of 45
Thread Starter 
here is what i see on the excursion on the old project
post #37 of 45
hmmm.. either I have inserted a wrong number, or Unibox models the performance of a PR system differently then WinISD.

With the parameters I took from the CSS website and doing 994g and 1984g in case iwas wrong how Unibox uses the weight info, I get a 23 or 26 hertz tune in a 70l enclosure volume. Hopefully someone will come on here and let me know if unibox is not a tool to use! biggrin.gif
post #38 of 45
yikes still close! And that is with the 5db of 20 hertz boost?


Curse my work PC not running WinISD anymore!!!!!!
post #39 of 45
meh something doesn't look right. The vented design tuned the same looks way different. I upgraded Office so maybe that has screwed something up... prolly all this on my end.
post #40 of 45
Thread Starter 
post #41 of 45
Thread Starter 
here is why i added the boost as you can see the pic on the right is without it and the one on the left with it
post #42 of 45
Thread Starter 
or it can be a issue with my winisd. i get slightly different results from the one i have on my office computer here versus the one i use on my home PC
post #43 of 45
Thread Starter 
post #44 of 45
Thread Starter 
here are a couple options i am working through on size for the new project of the PSI 12" with dual PR's. What else should i be concentrating on other than the SPL. My xmax on both the sub and PR's are both in check. what other issues do i need to be aware of on this build as earlier posted my previous project with another sub had an issue so let me know thought.
post #45 of 45
Thread Starter 


here is one more size
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: DIY Speakers and Subs
AVS › AVS Forum › Audio › DIY Speakers and Subs › Custom PSI 12" sub build ideas