open baffle and/or line array

[lolojr1]

hi i have my new speakers to start a new project.
72 2x3" woofefrs
i seem to be having trouble finding info on the subject can someone post some links or good keywords to search for the following speaker designs and or pics theory

i have searched on here and cant sem to find what i want

open baffle design, other than likwitz lab or o.b. sub stuff because that seems to be all i find
and line array stuff
thanks

[ScottG]

http://www.partsexpress.com/projects.../Kuze3201.html

http://www.geocities.com/dmitrynizh/labaffles.htm

[Dumbass]

Jim Griffin's Near-Field Line Array Whitepaper (the nflawp) is required reading.

http://www.audiodiycentral.com/resource/pdf/nflawp.pdf

With CTC of 2", you get comb-filtering issues starting around 5,000 (?) Hz. The typical solution would be to cross to one or more tweeter(s).

[ScottG]

Originally posted by Dumbass
Jim Griffin's Near-Field Line Array Whitepaper (the nflawp) is required reading.

http://www.audiodiycentral.com/resource/pdf/nflawp.pdf

With CTC of 2", you get comb-filtering issues starting around 5,000 (?) Hz. The typical solution would be to cross to one or more tweeter(s).

true, but with the partsexpress link you actually get to see what is happening with a 2" (vertical inch) driver, (rather than read some of the theory behind it). Both comb filtering AND midband gain ..and you can see that the midband gain is a BIT more important.

BTW, his comments on treble quality are probably NOT related to combfiltering, but rather primarily due to off-axis behaviour (which is no doubt lower in level).

[Dumbass]

Originally posted by ScottG
true, but with the partsexpress link you actually get to see what is happening with a 2" (vertical inch) driver, (rather than read some of the theory behind it). Both comb filtering AND midband gain ..and you can see that the midband gain is a BIT more important.

BTW, his comments on treble quality are probably NOT related to combfiltering, but rather primarily due to off-axis behaviour (which is no doubt lower in level).

I agree that there is interesting stuff to see. And the building techniques are cute. But all in all, I find it pretty half-assed, he just slaps in the drivers, doesn't even bother to power-taper them (despite how simple and proven effective it is), then uses a DSP to EQ it all flat.

There are much better thought-out projects out there.

[ScottG]

Originally posted by Dumbass
I agree that there is interesting stuff to see. And the building techniques are cute. But all in all, I find it pretty half-assed, he just slaps in the drivers, doesn't even bother to power-taper them (despite how simple and proven effective it is), then uses a DSP to EQ it all flat.

There are much better thought-out projects out there.

Oh yeah! ..crap design, but hey - it was for his science class ..considering a teacher's salary and budget, how noble is that?

I use it as a link to effectivly say that "these" are the major problems that need to be addressed. In fact I haven't found any other graphical representation that depicts the rising midband problem.

The open baffle line array is the only DIY that I know of.. again another design I wouldn't personally use (..and thats puting it kindly).

[lolojr1]

ive seen all those links and they are nice verry informative

i was curious about power tapering and not sure i was going to do it howmuch does it realy effect final output (spl) i cant imagine that these little spakers are going to handle tons of power

[lolojr1]

just bringing this to the top hoping to find more info if possible?

[ppfred]

Originally posted by lolojr1

i seem to be having trouble finding info on the subject can someone post some links or

http://audioroundtable.com/ArraySpeakers/
http://www.geocities.com/dmitrynizh/labaffles.htm
http://ldsg.snippets.org/ALSR/index.php3
http://yu-ra.tripod.com/array.htm
http://www.svconline.com/mag/avinsta...t_line_arrays/
http://home.earthlink.net/~jmiyake/index.html
http://www.rawacoustics.com/
http://www.selahaudio.com/id103.html
http://www.partsexpress.com/projects.../Kuze3201.html
http://www.roger-russell.com/xrt20.htm
http://www.lonesaguaro.com/speakers/array/array.htm

This should keep you busy.

I especially like this one:
http://www.geocities.com/dmitrynizh/labaffles.htm

and this one:
http://www.lonesaguaro.com/speakers/array/array.htm

fred p.