WinISD Charts. - diyAudio
Go Back   Home > Forums > Loudspeakers > Subwoofers

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 29th August 2011, 05:43 AM   #1
diyAudio Member
 
Join Date: Aug 2011
Default WinISD Charts.

I have been messing around with WinISD today I only changed a couple of things and this is what it "recommends" (I dont know if it is actually recommending this or it just randomly put something together.

I found a forum that gave me a very rough idea of what charts to look at but I cant tell whats good or whats bad. I hope I have the more necessary charts.

I am planning on using this driver Dayton Audio RSS315HF-4 12" Reference HF Subwoofer 4 Ohm High Fidelity Reference Series

I will most likely be using the bash 300 amp but I might use the Dayton Audio SA240-B.

Box 4.060 ft^3
Tuning freq. 20.16

1 vent
4in diameter
17.04in long
2 flanged ends.

1st: Trans Function Magnitude.
2nd: SPL System input 1.0W??? I noticed that changing this changes the chart so I left it at what it originally had 1.0W.
3rd: Cone excursion.
4th: Impedance.
5th: Rear port air velocity.
Attached Images
File Type: jpg winisd1.jpg (151.5 KB, 180 views)
File Type: jpg winisd2.jpg (132.8 KB, 176 views)
File Type: jpg winisd3.jpg (119.1 KB, 168 views)
File Type: jpg winisd4.jpg (122.1 KB, 165 views)
File Type: jpg winisd5.jpg (144.3 KB, 164 views)
  Reply With Quote
Old 29th August 2011, 09:49 AM   #2
oublie is offline oublie  United Kingdom
diyAudio Member
 
Join Date: May 2009
Location: Northern Ireland
The size of the box will be fairly accurate based on the alignment i.e. closed or ported box.

The size of the port always default to 4 inches ideally for a sub the port should be approx half the diameter of the driver but this is where the design skills kick in.

For example if you change the wattage so that the xmax / excursion of the driver is hitting the red max line then you will see that the port velocity has shot through the roof.

In order to stop this and keep the velocity fairly low you need to use a larger diameter port. The problem with this is that it will not just have a larger diameter but the length of the port will increase drastically.

Play around with the numbers and see what you get.

Remember in a ported alignment your excursion will be low around the port tuning or frequency the box is designed for but it will then shoot through the roof.

Also the actual box you build will be a fair bit larger than what winisd shows as this is only showing the amount of air in the box - not the thickness of wood, not the port itself and not any bracing you would but in the box.

I hope this makes sense.
__________________
There are 10 types of people in the world: Those who understand binary, and those who don't...
  Reply With Quote
Old 29th August 2011, 11:41 AM   #3
Mikey p is offline Mikey p  Canada
diyAudio Member
 
Join Date: Feb 2004
Location: Sask. Canada
The Dayton 240-B has boost at 30 hz, it's best application is for sealed designs. The boost can be defeated by soldering in a couple of different resistors, or get the Dayton 240 with doesn't have any boost.

If this is for home theater then the driver models well in 4 cu.ft. tuned to 21 hz. The Bash 300 with the default hi-pass filter would be ideal.

Which version of WinISD are you using?

Last edited by Mikey p; 29th August 2011 at 11:53 AM.
  Reply With Quote
Old 29th August 2011, 02:11 PM   #4
infinia is offline infinia  United States
diyAudio Member
 
infinia's Avatar
 
Join Date: May 2005
Location: Californication
don't forget to take the room gain into account. ie the smaller the room, the more lift at lower frequencies. so that max flat Bass Reflex BR tunings have the tendencies to give boomy sound in rooms. maybe OK for some Home Theater sound effects. I tend to go for smaller BR boxes with low Fb tuning, with a sloped LF response somewhere between a sealed design and what you show. Check max SPLs and port velocity by upping power from 1W until voice coil linear (xmax) travel approaches the limit.
__________________
like four million tons of hydrogen exploding on the sun
like the whisper of the termites building castles in the dust

Last edited by infinia; 29th August 2011 at 02:14 PM.
  Reply With Quote
Old 29th August 2011, 06:24 PM   #5
diyAudio Member
 
Join Date: Aug 2011
Quote:
Originally Posted by oublie View Post
The size of the port always default to 4 inches ideally for a sub the port should be approx half the diameter of the driver but this is where the design skills kick in.

For example if you change the wattage so that the xmax / excursion of the driver is hitting the red max line then you will see that the port velocity has shot through the roof.

In order to stop this and keep the velocity fairly low you need to use a larger diameter port. The problem with this is that it will not just have a larger diameter but the length of the port will increase drastically.
I will mess around with the numbers with a 6in port. I have been told many time not go go bellow 4 inches lol.

Here are some numbers if you would like to take a look at it.

At 300W Air port velocity.
69.2 ft/s at 10hz
21.3 ft/s at 18hz
100 ft/s at 22hz

At 300W Cone excursion.
The max mark is at .56in
1.576 in at 10hz
.56in at 17.5hz
and everything else is below .56in
  Reply With Quote
Old 29th August 2011, 06:27 PM   #6
diyAudio Member
 
Join Date: Aug 2011
Quote:
Originally Posted by Mikey p View Post
The Dayton 240-B has boost at 30 hz, it's best application is for sealed designs. The boost can be defeated by soldering in a couple of different resistors, or get the Dayton 240 with doesn't have any boost.

If this is for home theater then the driver models well in 4 cu.ft. tuned to 21 hz. The Bash 300 with the default hi-pass filter would be ideal.

Which version of WinISD are you using?
I am using the pro/alpha version.

This is for my computer but I also play all my movies through my computer. I would say %75 music %20 movies %5 games. I don't care what the games sound like though.

21hz seems kind of low. Dont most people have it tuned in at 28-33ish?
  Reply With Quote
Old 29th August 2011, 06:30 PM   #7
diyAudio Member
 
Join Date: Aug 2011
Quote:
Originally Posted by infinia View Post
don't forget to take the room gain into account.
This is something that will have to be ignored. I move more often than I should lol
  Reply With Quote
Old 29th August 2011, 07:36 PM   #8
Mikey p is offline Mikey p  Canada
diyAudio Member
 
Join Date: Feb 2004
Location: Sask. Canada
Quote:
21hz seems kind of low. Dont most people have it tuned in at 28-33ish?
It's not to low for movies, there's lots of content down to 20 hz and lower.
  Reply With Quote
Old 29th August 2011, 07:38 PM   #9
diyAudio Member
 
Join Date: Aug 2011
What is the transfer function magnitude? I changed the port size/length and well...

Air velocity peaks at 66ft/s

Tuning freq 29hz
Vent diameter 6in
Vent length 17in
-3db 24hz
Attached Images
File Type: jpg winisd6.jpg (157.2 KB, 24 views)
  Reply With Quote
Old 29th August 2011, 07:42 PM   #10
diyAudio Member
 
Join Date: Aug 2011
Quote:
Originally Posted by Mikey p View Post
It's not to low for movies, there's lots of content down to 20 hz and lower.
Well that's good! How would this effect my music? I have another woofer that is on my current setup and it is staying I believe it is tuned in at 31hz.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
impedance v freq. charts farmerjack61 Multi-Way 8 13th April 2011 08:39 PM
Excel charts (graphs) johngalt47 Everything Else 3 28th March 2007 10:46 AM
equations for FR charts Dave Jones Multi-Way 4 24th December 2003 09:40 PM


New To Site? Need Help?

All times are GMT. The time now is 04:10 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2