Speakerplans.com Homepage
Forum Home Forum Home > Plans > Ported Enclosures
  New Posts New Posts RSS Feed - WinISD model
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

WinISD model

 Post Reply Post Reply
Author
Message
sn95 View Drop Down
Registered User
Registered User


Joined: 10 March 2013
Location: USA
Status: Offline
Points: 351
Post Options Post Options   Thanks (0) Thanks(0)   Quote sn95 Quote  Post ReplyReply Direct Link To This Post Topic: WinISD model
    Posted: 01 November 2015 at 9:16pm
when modeling drivers in WinISD is transfer more important then SPL driver 1 has a better trans and driver 2 more spl.
Back to Top
ceharden View Drop Down
The 10,000 Points Club
The 10,000 Points Club
Avatar

Joined: 05 June 2005
Location: Southampton
Status: Offline
Points: 11776
Post Options Post Options   Thanks (0) Thanks(0)   Quote ceharden Quote  Post ReplyReply Direct Link To This Post Posted: 01 November 2015 at 9:46pm
If you are comparing drivers then you must look at the SPL plot.  The transfer function only shows the shape of the response and is relative only to the average sensitivity of the driver.
Back to Top
bob4 View Drop Down
Old Croc
Old Croc
Avatar

Joined: 29 February 2004
Location: Finland/Germany
Status: Offline
Points: 1842
Post Options Post Options   Thanks (0) Thanks(0)   Quote bob4 Quote  Post ReplyReply Direct Link To This Post Posted: 02 November 2015 at 10:12am
you need to consider driver excursion as well!

IMO you need to balance AT LEAST max SPL, magnitude response and excursion (port air velocity would be good too to prevent "farting")

I haven't designed anything of my own, just simulated known designs with different drivers and some of my own ideas (only CB and reflex so far!)

my method (corrections and improvements warmly welcome! :) ):

1. adjust box volume (and tuning freq for reflex) if unhappy with Winisd's suggestion
2. check freq response
3. set signal to half rated RMS power
4. examine excursion plot -> if it's at half xmax, you can mess with box size or eq (linkwitz transform) to get the LF response the way you want it; if excursion is close to or exceeding the limit there is something wrong! at the very low end between 20 - 40 you will usually run out of excursion anyway, so you can set a HPF to limit excursion there. Above 40 Hz, you can actually decrease excursion by tuning the cabinet higher (port resonance decreases driver excursion!!!). 
5. recheck magnitude response and SPL; if the curve looks good, check if there is excursion to spare -> if yes increase signal power until you reach excursion limit; That gives you max input power and SPL max for your current design
6. if not happy with freq response, you can readjust box volume, tuning freq and EQ/filters

all these are interdependent. Bigger box also decreases cone control -> increasing excursion
What happens depends on the individual driver.

Try simulating many drivers with a certain set box volume. You will see the difference between the different drivers, some will be impossible to get acceptable results with...... TongueEmbarrassedOuch

IMO one way to recognize a potentially suitable driver for your design goal is if WINISD automatically comes up with a box volume close to your design goal - you shouldn't have to fiddle around too much to get a good result.


Back to Top
sn95 View Drop Down
Registered User
Registered User


Joined: 10 March 2013
Location: USA
Status: Offline
Points: 351
Post Options Post Options   Thanks (0) Thanks(0)   Quote sn95 Quote  Post ReplyReply Direct Link To This Post Posted: 02 November 2015 at 12:48pm
thank you very much for all your inputs I have mess around with box size port tuning.and also adjusted input voltage to indicate driver xmax.looking at trans driver a is about +3dB and looking spl driver b is + 3 to 4 dBs in the 30/40 hz.My go is good spl to about 25 hz.
Back to Top
 Post Reply Post Reply

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 12.06
Copyright ©2001-2023 Web Wiz Ltd.

This page was generated in 0.109 seconds.