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Old 16th January 2013, 11:21 AM   #921
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Are side wall reflections bad for a dipole's rear wave? If a speaker is towed in a bit to the listener, it seems it would be an issue.
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Old 16th January 2013, 12:20 PM   #922
lolo is offline lolo  France
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that's one for Rudolf!! :-)
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Old 16th January 2013, 01:50 PM   #923
Rudolf is offline Rudolf  Germany
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Quote:
Originally Posted by SpinMonster View Post
Are side wall reflections bad for a dipole's rear wave? If a speaker is towed in a bit to the listener, it seems it would be an issue.
Master, you summond me?
If wavelength are short compared to the room dimensions, a dipole will radiate in its dipole-8 pattern - regardless of the side walls. Reflections off these walls will be as good or bad as with any other loudspeaker.
If wavelength are in the same order as the room dimensions or even larger, the "radiation pattern" will be dictated by the room (room modes), as will be the case with any other loudspeaker.
So what seems to be an issue to you exactly? How would you see off-axis reflections (?) more harmful than others?

Rudolf
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Old 16th January 2013, 11:16 PM   #924
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Default Intersting VPL!

Hi All,

This link : ImageShack® - Register

show's some interesting open baffle, the side shots of the big grey cabinets, the Acrylic cabinets and the side shot of the 10 inch Volt midrange show
"Variable Path Length Cancellation" ( VPL !).
The two way Encore and the Line Array's are sealed.

More to follow but about 20 pics so far.
All are all fully active, no passive crossovers at all, no domes or ribbons, only Manger or full range BMR plus olw mid / and or bass.

Line array, two way, three way, sealed box or open baffle.
Acrylic, Alloy, Ply Wood, GRP and Corian / Velstone cabinet material.
Even a pair of one off solid wood horns for the Manger!

It was a blast, hope you enjoy the pics and get some ideas to experiment.

With such high quality PC software (JRiver and JPlay), and low cost but high quality DSP hardware / electronics now is the best time ever to design and build your own speakers.
Also great speaker / room measuremnt software, mics and pre amps / sound cards are all very affordable now.
Great sounding power amps ( Hypex Ncore) that are small and efficient so they can be built into / onto the back of cabinets easily.

Hope this helps inspire!
Cheers
Derek.
Attached Images
File Type: jpg 005 (Copy).JPG (104.6 KB, 1437 views)
File Type: jpg Overkill Audio Encore with grill 001.jpg (97.9 KB, 1433 views)
File Type: jpg Overkill construction- multi layer ply 001.jpg (86.7 KB, 1420 views)
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Old 17th January 2013, 10:38 AM   #925
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Quote:
Originally Posted by Rudolf View Post
Master, you summond me?
If wavelength are short compared to the room dimensions, a dipole will radiate in its dipole-8 pattern - regardless of the side walls. Reflections off these walls will be as good or bad as with any other loudspeaker.
If wavelength are in the same order as the room dimensions or even larger, the "radiation pattern" will be dictated by the room (room modes), as will be the case with any other loudspeaker.
So what seems to be an issue to you exactly? How would you see off-axis reflections (?) more harmful than others?

Rudolf
My issue is actually the reverse of what youre thinking.

I have built a flat dipole Neo3pdr and RS180. I'd like to add structural rigidity to the flat panel (2 x 3/4 mdf glued together) by adding a brace to the back which would interfere with dispersion to the side walls. Its a sort of L- shaped baffle as seen from above.
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Old 17th January 2013, 12:06 PM   #926
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Quote:
Originally Posted by Overkill Audio View Post
Hi All,

This link : ImageShack® - Register

show's some interesting open baffle, the side shots of the big grey cabinets, the Acrylic cabinets and the side shot of the 10 inch Volt midrange show
"Variable Path Length Cancellation" ( VPL !).
The two way Encore and the Line Array's are sealed.

More to follow but about 20 pics so far.
All are all fully active, no passive crossovers at all, no domes or ribbons, only Manger or full range BMR plus olw mid / and or bass.

Line array, two way, three way, sealed box or open baffle.
Acrylic, Alloy, Ply Wood, GRP and Corian / Velstone cabinet material.
Even a pair of one off solid wood horns for the Manger!

It was a blast, hope you enjoy the pics and get some ideas to experiment.

With such high quality PC software (JRiver and JPlay), and low cost but high quality DSP hardware / electronics now is the best time ever to design and build your own speakers.
Also great speaker / room measuremnt software, mics and pre amps / sound cards are all very affordable now.
Great sounding power amps ( Hypex Ncore) that are small and efficient so they can be built into / onto the back of cabinets easily.

Hope this helps inspire!
Cheers
Derek.
Hi Derek

Is the link correct? It leads me into my own account at ImageShack.

Best regards

Gisle
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Old 17th January 2013, 06:47 PM   #927
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Default Image shack link problems

Hi Gisle,

I ham having trouble linking to my image shack page.
Normally I just copy the URL from the tool bar, paste it to a post and that works.
I am new to image shack, I am I doing thois wrong?
Thanks
D.

Last edited by Overkill Audio; 17th January 2013 at 06:48 PM. Reason: spelling.
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Old 18th January 2013, 09:52 AM   #928
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Join Date: Nov 2005
Location: Norway
Sorry Derek,

I am no expert on ImageShack. I got registered there after I saw your link, i.e. to see your pictures :-)

But I guess there are others here at the forum with knowledge, anybody? ;-)

Btw: some VERY impressive speakers you have designed. Looking forward to hear up-dates from your last dipole (the green-one): is it finalized?

Br

Gisle
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Old 18th January 2013, 11:01 AM   #929
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my "not so big" OB's
with a sub in the middle, this is a bass reflex.
I also made a ripole sub in the same style, sounds better
and in desktop format too
IMG_0866.JPG

IMG_0842.JPG

IMG_0233-001.JPG
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Old 18th January 2013, 11:43 AM   #930
lolo is offline lolo  France
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nice! the white and black tall speaker behind looks reaaaaally cool, sort of 70" sc-fi.
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