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Madmike2

Madmike2

Member
Joined 2005
Got my first plan (that might work)

6 x NEO8 PLANAR TRANSDUCER
4 x DAYTON RS225S-8 8" REFERENCE SERIES SHIELDED WOOFER

Parallel Line array

Double spacing center to center on woofer line

Planar array 2 inch in trailing edge (inner) ^ inch to center alignment of woofer

54" tall by 36 inch wide (somewhere near a 1/4 wave length of a 95 hz....i think dont have calc with me at the gym here)

Isolated baffle for woofers which would nearly time align the planar and woofer mechanicaly

1 inch white poplar main baffle 1/4 inch white pine for baffle sandwich with 1/4 inch sonically inert foam to keep woofer vibrations off the main baffle of planar's

2 center woofer on each panel with 6db high pass at 120 and all 4 woofers lowpass at 18 db 1600 hz

planars high pass 24 db 1700

there is a phase veriance in this thought that i cant finger right now
probably my woofer choke is not smart

i am on my wireless right now so i dont have anyway of checking my frankenstien monster right now

am i glad i found this forum ....who do i make a decent donation to? :grouphug:
 
planet10

planet10

frugal-phile™
Joined 2001
planet10-hifi.com
Paid Member
Madmike2 said:
no more seeking :D i must build or i will turn to the dark side and buy ............................ BOSE !! :cannotbe:
Click to expand...

They aren't line arrays but since you have not proposed a real line array anyway...

Then i prescribe a pr of Visaton B200s, a 10" x 48" piece of wood -- a "leg". and a sheet of as big as you can live with foam, and build an OB. You'll need about 10W or so (more is OK, current amp probably better than voltage amp)

http://www.diyaudio.com/forums/showthread.php?postid=271032#post271032

http://www.diyaudio.com/forums/showthread.php?postid=325562#post325562

http://www.diyaudio.com/forums/showthread.php?postid=592920#post592920

http://www.diyaudio.com/forums/showthread.php?postid=61123#post61123

http://www.diyaudio.com/forums/showthread.php?postid=65227#post65227

http://www.diyaudio.com/forums/showthread.php?postid=231369#post231369

http://www.diyaudio.com/forums/showthread.php?postid=234860#post234860

dave
 
S

ScottG

Member
Joined 2003
Madmike2 said:
Well i am going to do this for sure now. So you think that 2 baffles are nessicary per side? one for the tweeter line and one for the woofers ? Even if i can decouple the woofers from the planar line?
Click to expand...

Generally yes for the reason I stated:

"If I were you I'd try and keep the line with as little width as posible (gives better imaging)."

But which design are you still pursuing - the one I posted or the one you posted? If you are pursuing your design then you can't have the woofers very far from the tweeter line.
 
Madmike2

Madmike2

Member
Joined 2005
I am sticking with mine but i was floating idea incorporations around. Seperation is doable if i spaced them i think at 3.5 feet thats 1/4 octave at 90 hz using driver SD and fuzzy logic of the baffle energy as a driver.

Also dave mentioned that if i go to narrow i would lose bottom end. I found many references to this.
 
S

ScottG

Member
Joined 2003
Madmike2 said:
I am sticking with mine but i was floating idea incorporations around. Seperation is doable if i spaced them i think at 3.5 feet thats 1/4 octave at 90 hz using driver SD and fuzzy logic of the baffle energy as a driver.

Also dave mentioned that if i go to narrow i would lose bottom end. I found many references to this.
Click to expand...


Then you can not seperate the midwoof line from the tweet line (or you will end up with comb filtering).
 
Madmike2

Madmike2

Member
Joined 2005
I am drawing something right now. I get the comb filter picture. I understood that imediately when i saw it. It was the same thing they taught us in AE for sound reinforcement in Mid to large venues. But i was thinking that small venue rules would apply here. There will not be enough distance for the C waves to form will there??
 
planet10

planet10

frugal-phile™
Joined 2001
planet10-hifi.com
Paid Member
Madmike2 said:
Hmmm so it seems people are getting BIG sound out of small driver situations.
Click to expand...

Small drivers are 3 & 4 inch. 8" is pretty big for a midrange -- but in this case it works well enuff that you can live without the woofers & the tweeter if pressed. You use the tweeter to get a wider seetspot, and with an OB you need to move a lot of air so some highish Q prosound 15s or 18s do a good job.

dave
 
S

ScottG

Member
Joined 2003
well at 24 db an octave there might not be much.. (spl would be low where the lines overlapped)

In any event you could digitally delay the lines so that it would work:
http://pcazeles.perso.cegetel.net/acxo.htm
or:
http://www.behringer.com/DCX2496/index.cfm?lang=ENG

It would also help you with eq. for the dipole bass problem. (though I'd recomend the ACXO over the behringer for this + it has room correction that the behringer does not have.)

I rather like the basics behind this look:
http://www.martinlogan.com/spgal_ttower_zoom.html
http://www.martinlogan.com/statement_speaker.html#none
The black line could be your tweeter line and the side panel could have your midwoof line.
 
Madmike2

Madmike2

Member
Joined 2005
An externally hosted image should be here but it was not working when we last tested it.



Ok so the woofers run right up the center on the isolater baffle . the tweets are 1 diameter on the inside offset. Each of the woofers is a diameter and 1/2 seperated. the planar line will be 2 inches higher then the woofers top and 2 1/4 inches higher then the bottom.

I centered the woofers to make use of all the baffle area it can see. With the baffle and isolator it is nearly time aligned mechanically but i dont think thats gonna be relevant in this array or in OB in particular. I am still formenting the math in my pea sized brain.

This is all messed up to me since i am trying meld two concepts. Obviously someone has done it before but there is not to much info PRO or CON on something like this. Just the Gilmore's which i am using for a spring board. I am interpreting what i see and trying to figure out WHY he did something a certain way.
 
Madmike2

Madmike2

Member
Joined 2005
ScottG said:
well at 24 db an octave there might not be much.. (spl would be low where the lines overlapped)

In any event you could digitally delay the lines so that it would work:
http://pcazeles.perso.cegetel.net/acxo.htm
or:
http://www.behringer.com/DCX2496/index.cfm?lang=ENG

It would also help you with eq. for the dipole bass problem. (though I'd recomend the ACXO over the behringer for this + it has room correction that the behringer does not have.)

I rather like the basics behind this look:
http://www.martinlogan.com/spgal_ttower_zoom.html
http://www.martinlogan.com/statement_speaker.html#none
The black line could be your tweeter line and the side panel could have your midwoof line.
Click to expand...


Jesus. thats EXACTLY what i was thinking :D

You notice how the mid high tower has an adjustable base. semi articulated. You can toe the towers. Thats genius. I do not want to think what kind of DSP they are using when they come and install that beasty in your house.

I remember as a kid those Infinity Behemoths we had. There was so much crap associated with them that i had to call for help to turn on 102.1 fm

Really nice speakers by the looks of them. think they will run on the forums various gainclone amps ? :bigeyes:
 
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