
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 
28th November 2005, 10:09 PM  #1 
diyAudio Member
Join Date: Sep 2005

FE168EZ Open Baffle
How do I calculate the low frequency droppoff point for the FE168EZ Sigma on an open baffle? SL's Website explains the calculation in terms of finding the Fequal point, but I can't seem to make sense of his math... in Fequal .17v/D, what exactly does v and D stand for and what units should I use?
Also, in line with the Orion design, would the FE168Ez make a suitable pairup with the FT17 Supertweeter in an open baffle? I am considering the pros and cons of using different drivers in the setup. I can design and make my own electronic crossover and amplifier. I would prefer to use crossover points of 250 and 810K. I can't seem to find many successful examples of the 168 in an open baffle. Last, would two FE 108s work with the FT17 in a MTM Open Baffle as an alternative? 
28th November 2005, 10:17 PM  #2  
diyAudio Member
Join Date: Jun 2003
Location: Menlo Park, CA

Re: FE168EZ Open Baffle
Quote:
D is the path difference between front and back waves D is approximately half the width of a flat baffle but should be determined empirically 

29th November 2005, 02:57 AM  #3 
diyAudio Member
Join Date: Sep 2005

Is this corect>
I get 42.68 Hz when I multiply 1130 by .17 and then divide by 4.5 inches for half of the width of a 9" baffle.
Is that a correct estimation? I was estimating around 250 Hz based on the table in the "SingleDriverWebsite." Does the actual driver used matter or is the primary factor the width of the baffle? If I use .75 inch plywood, do I need to take plywood material or baffle thickness into account? Thank you for your assistance, I really like the Fostex driver and the pair I mentioned above would have a higher SAF than the current pair in the Orion. The wife is not happy about the cost either, and I need to try to minimize that... 
29th November 2005, 04:37 AM  #4 
diyAudio Member
Join Date: Jun 2005
Location: Ontario / Kentucky

check your units. I think you're mixing feet and inches. That's why everyone should work in SI units

29th November 2005, 04:44 AM  #5 
diyAudio Member
Join Date: Sep 2005

Doh!
Yes, 1130 Feet/second is quite different from 13560 inches per second.
That leaves me with an FEqual coefficient of 2305.2/x where x equals half of the baffle width. Why not just keep the math simple and leave it at 2305.2/x? I am such an idiot. 
29th November 2005, 08:17 AM  #6  
diyAudio Member
Join Date: Mar 2003
Location: Germany

Re: FE168EZ Open Baffle
Quote:
If you want to get a realistic picture of its behaviour in an OB, try xlbaffle.xls http://baseportal.de/cgibin/basepor...&cmd=all&Id=15
__________________
www.dipolplus.de 

Thread Tools  Search this Thread 


Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Does open baffle suffer from baffle step?  454Casull  MultiWay  15  19th May 2012 04:12 PM 
Openbaffle baffle length  matejS  MultiWay  2  21st September 2010 05:49 PM 
Murphy baffle radios [ open baffle ]  keithpeter  Full Range  10  11th September 2007 08:59 PM 
what effect does baffle have on openbaffle system?  kappa546  MultiWay  6  24th January 2006 11:21 PM 
Australians what solid timbers for baffle? (open baffle loudspeaker)  tktran  MultiWay  13  30th November 2004 12:09 AM 
New To Site?  Need Help? 