Welcome, Guest. Please Login or Register
Decware Audio Forums
11/25/14 at 23:34:25


Pages: 1
Send Topic Print
modeling sealed section confusion (Read 2499 times)
A7luver
Ex Member



modeling sealed section confusion
10/15/05 at 01:04:42
 
I've read over the plans and several of the posts, and am confused  as to which  is right.  The plans say to model the closed section on a regular 4th order single reflex cab (vented), and some of the posts say to use the 4th order Bandpass formula for calculating the area of the sealed section.  Which S factor for the bandpass is being used for the calculation? I don't remember which post it was (should have written it down), but it says something to the order of use the OPTIMUM 4th order bandpass, which would be the S factor of 7.  Thanks to anyone who can clear this up for me.
Back to top
 
 
  IP Logged
gexter
Ex Member



Re: modeling sealed section confusion
Reply #1 - 10/16/05 at 05:29:07
 
If I understand you correctly

I use the 4th order model and being a proper 4th order one side of the driver is sealed. or so I thought anyway
Thats how I do it or was doing it.
Back to top
 
 
  IP Logged
A7luver
Ex Member



Re: modeling sealed section confusion
Reply #2 - 10/16/05 at 17:11:32
 
Thanks!!!!!! That's what I wanted to know.  I'll just follow the recommendation in the plans as well as yours.  Now for some sawdust.
Back to top
 
 
  IP Logged
J_Rock
Ex Member



Re: modeling sealed section confusion
Reply #3 - 10/17/05 at 04:15:02
 
Yeah just model your driver in its optimum 4th order, then make the WO sealed chamber the same size.
Back to top
 
 
  IP Logged
jj420
Ex Member



Re: modeling sealed section confusion
Reply #4 - 10/20/05 at 17:10:17
 
uhh..

1st order = no volumes, OB/IB
2nd order = one volume, sealed
3rd order = one volume, vented or BR or PR
4th order = two volumes, sealed back, vented front
5th order = two volumes, sealed back, sealed front (dunno why one would build it, but its on the list)
6th order = two volumes, vented front, vented back
7th order = 3 volumes sharing 2 drivers with 2 ported
8th order = 3 volumes sharing 2 drivers with 3 ported
9th order = same idea as 5th order
10th order = depends on who you talk to, some call it series loading, BOSE calls it thiers, others call it a waste of time, usually some arrangement of volumes within volumes and lotsa ports etc. very good at making loud BP style bass (peaked)

so you model the WO on a BP4 alignment, aiming for a perfect Q of .707 to balance extension and power handling.
Back to top
 
 
  IP Logged
A7luver
Ex Member



Re: modeling sealed section confusion
Reply #5 - 10/22/05 at 22:55:22
 
WOW!!! Thanks.  That has to be the definitive answer to my question.  I wasn't aware of the "orders" above 6. Thanks again!
Back to top
 
 
  IP Logged
gexter
Ex Member



Re: modeling sealed section confusion
Reply #6 - 10/24/05 at 06:54:56
 
Just goes to show you that there is Order in the universe Wink

gex
Back to top
 
 
  IP Logged
jj420
Ex Member



Re: modeling sealed section confusion
Reply #7 - 10/27/05 at 15:11:37
 
LOL, order in the universe HAHAHA!

not this one....
Back to top
 
 
  IP Logged
Pages: 1
Send Topic Print