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Old 1st June 2007, 08:38 AM   #1
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Default OB simulation

Hi everyone. I'm designing my first OB and need some advice. The speakers are 3 way using two Goldwood GW-1258 woofers, a PAudio WN8S mid, and the Vifa DX25 in a waveguide. I'm shooting for an F3 around 80-100 Hz where it will be crossed to a monopole sub around 60-80 Hz. I've already built a test baffle:


Click the image to open in full size.


A flat baffle needed to be too wide, and Ubaffle could not cross well at 350 Hz. So I decided to try tapered wings folded back. This may not have been the best choice but be that as it may, I'd like to know if this Edge sim is accurate as far as bass response:


Click the image to open in full size.

This includes the floor image so that's why there is 4 woofers. Also the upper woofer is centered 22" off the ground so I'm wondering if that is really included in the floor image? I have sim using just the lowest woofer also because I wasn't sure.

Thanks for any replies,
Brandon
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Old 2nd June 2007, 05:43 AM   #2
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Come on I know there is big brain out there with some helpful advice!!
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Old 3rd June 2007, 12:30 AM   #3
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Old 3rd June 2007, 12:50 AM   #4
ttan98 is online now ttan98  Australia
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you should go to this site, there are many HELPFUL experts there.

http://www.audiocircle.com/circles/index.php?board=90.0
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Old 3rd June 2007, 12:55 AM   #5
Hatti is offline Hatti  Germany
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Hi Brandon,

I try to understand what you like to know. First I will tell you; I built my first OBīs in March2007.

They are much different, but I also try this floorsimulation with edge. The different is the "form" from the wall and the drivers are 4 vintage fullrange-drivers in "optimal" positions. So I get a special f-curve to have less problems with position the OB in the room!

I noticed that the frequency-curve, by using the doobling for floorsimulation, not be correct. It will only to be show the deepest frequency.

edge is only for simulation the free hanging baffle. I added for standing on the floor and near by wall- 1 octave! This will be much easier and itīs getting in reality.

If you like to see my actuel open baffle, please visit my "built up" homepage: http://freenet-homepage.de/stratihat...1e1d3fe4a.html

Nice greatings from germany, Hatti
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Old 3rd June 2007, 02:23 AM   #6
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ttan98> much appreciated. I'll check it out.

Hatti> your OB's are HUGE! Too bad I don't know German because the design seems interesting...
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Old 3rd June 2007, 07:21 AM   #7
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OFFTOPIC: Nice bike! YZ?
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Old 3rd June 2007, 07:41 AM   #8
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'02 YZ250 She don't look like much but she's got it where it counts
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Old 3rd June 2007, 12:22 PM   #9
Hatti is offline Hatti  Germany
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Hi,

I try to start an own new tread, to show my OB-Projekt, but it doesnīt work? Iīm a new member and there are a lot of stones in my way to post!
So I only want to tell you; now I translate my open Baffle side, from my homepage: http://freenet-homepage.de/stratihat...1e1d3fe4a.html

...into english. Please enjoy, Hatti

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Old 3rd June 2007, 01:14 PM   #10
Paul W is offline Paul W  United States
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Hi Brandon,
With the tools generally available to us, I'm not sure there is a definitive answer to your question because there are multiple factors at work. The mirror image floor gain is real at low frequency because the driver is only operating in half space. On the other hand, reflectivity of the floor is imperfect and it changes with frequency (carpets etc)...I doubt the Edge can accurately compensate for that.

You've already built the baffle so why not take it outdoors and measure?
Paul
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