>  JA>         My youngest son builds KILLER car subs. He has the LEAP app
 >  JA> and several others, as well as 3D modeling apps that pretty well
 >  JA> leave no surprises in his projects. 
 > Cool!  Where can I find these?  
   Sorry Matt. I don't have the address or phone and my son is on vacation 
for 
another week. The LEAP program for IBM and MAC computers is widely used by 
many of the bigger shops. You can find it and several others like it in The 
Cookbook and Speaker Builders Mag. I'll get the phone..etc when my son 
returns. It is a pretty fascinating app. You just plug in your space 
available,
and the data on the drivers you want to use and away it goes. 
   There are several available that even take readings from your finished 
product and offer suggestions how to improve you speakers. Don't get me 
wrong. 
It doesn't do the work for you. It just takes your work and knowledge/design 
and gives a very good representation of what to expect from it. 
   For my experience building subwoofers for the home I had a difficult time 
calculating the extensive bracing and acoustic foam or batting that I was 
using in relation to the internal space. I was advised by a number of people 
that that space didn't matter and wouldn't make a difference on a tuned port 
box. WRONG! It certainly did. I would imagine that a bandpass would be even 
more critical. Although I have to confess that my son was the one that ran 
the 
program and called me with the final numbers.
   If I am not mistaken the system is fairly expensive compared to the others 
advertised. I believe the barebones program was like $300. Then you could add 
to it including a proprietary board that managed the mic. I'll check for you 
if you don't have The Cookbook sitting around somewhere.
   Oh, BTW, it does work with OS2. Well behaved also.
Cheers, John
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