
Home  Forums  Rules  Articles  diyAudio Store  Gallery  Wiki  Blogs  Register  Donations  FAQ  Calendar  Search  Today's Posts  Mark Forums Read  Search 
MultiWay Conventional loudspeakers with crossovers 

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 

Thread Tools  Search this Thread 
3rd July 2004, 02:46 PM  #1 
diyAudio Member
Join Date: Apr 2002
Location: Belleville, IL.

Need help using "Edge" to design Baffle Step Correction Circuit please.
Hi all,
I'm usually lurking and posting over in the DIY Tubes area but I need a little help. I have a pair of FE206Es in BR cabinets that I built about a year ago and I would like to design a baffle step correction circuit for them. I have downloaded the "Edge" program but I'm having a little trouble understanding everything I'm looking at. Can someone hold my hand and walk me through this first design? Any help is appreciated.
__________________
Gavin 
3rd July 2004, 09:53 PM  #3 
diyAudio Member
Join Date: Apr 2002
Location: Belleville, IL.

Well where do I start? I put in the dimensions for the baffle 289 x 800 mm. I then chose circular for the driver shape. I used 200 mm for the driver dimensions but I'm not sure that is correct as the membrane itself is only 175 mm across. I placed the microphone about 2.5 mters away because tha is how far away my listening position is from the face of the speakers. I then hit the "apply!" button and then asked the program to suggest "F1 and F2". It "suggested" that R1 should be 10K, R2 should be 10K, L be 6813 mH and C be .068 uF. Somehow I don't think these figures are right. That is why I'm asking for help. I'm not sure what I did wrong but I certainly did something wrong and I have no idea what it was. I built the BR cabinet according to the plans suggested by the Fostex engineers at the bottom of the PDF for the back loaded horn plans.
__________________
Gavin 
3rd July 2004, 10:08 PM  #4 
diyAudio Member
Join Date: Feb 2004
Location: Stockholm

Ah OK, you have two choices of compensation circuit, 1 or 2. You select the value of R1, in the active case (usually circuit 2) you typically enter a relatively high value for R1 (eg 10k), and then you should use R2=10K and C=68nF. If you want to use a passive circuit, circuit 1 is typically used, and the speaker is modelled as a resistor=R1 (which may be a bit optimistic, actually). So if you enter 6 ohms for R1, Edge tells you to use L=4 mH and R2 of 6 ohms.
The sillily high value for L originates in that Edge calculated it based on a loudspeker impedance of 10000 ohms, which of course is crazy. 
3rd July 2004, 10:31 PM  #5  
diyAudio Member
Join Date: Apr 2002
Location: Belleville, IL.

Quote:
__________________
Gavin 

3rd July 2004, 10:49 PM  #6 
diyAudio Member
Join Date: Feb 2004
Location: Stockholm

I'd take it halfway through the suspension, the same way as you do when you calculate the effective piston area. So for an 8" speaker it would be less than 8", maybe 67". You could actually calculate the effective diameter from Sd if you wish: d=2*sqrt(Sd/pi)

Thread Tools  Search this Thread 


Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
"Box" design and bracing for open baffle woofer array  ryoshu  MultiWay  0  17th August 2008 06:07 PM 
Modeling a Baffle Step Correction Circuit  Seadweller  Full Range  4  28th December 2007 09:51 PM 
New version of The Edge baffle step simulator  Svante  MultiWay  13  8th December 2004 10:16 AM 
Baffle step correction circuit  how to design?  mr_push_pull  MultiWay  28  9th November 2004 08:27 PM 
The Edge simulates the baffle step.  Svante  MultiWay  0  30th March 2004 12:33 PM 
New To Site?  Need Help? 