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-   -   Desktop Dipole Monitors (http://www.diyaudio.com/forums/multi-way/225399-desktop-dipole-monitors.html)

Melo theory 10th December 2012 06:54 PM

Desktop Dipole Monitors
 
Ok, i'm starting this project tomorrow.

http://i167.photobucket.com/albums/u.../Untitled1.jpg

I'm going to try out the whole baffle-less monitor craze.

So, they may look like they are in boxes but there are actually 1/2" slits all around them.
The reason for this is that i'm going to try for complete directivity by absorbing just enough of the rear wave to not beam,
That is just enough to have the dipole cancellation null at the sides without the additive amplitude of what frequencies will be in phase at the sides.
It will take a lot of experimenting with different thickness of foam, but I think it just might work.
For the bass driver, i'm not trying to absorb anything, the enclosure with the slits is just for rigidity.

These are the drivers i'm using.....
Dayton RS225S-8 8" Reference Shielded Woofer 8 295-366

Dayton Audio RS100-4 4" Reference Full-Range Driver 4 Ohm 295-378

The crossover will be at 750Hz, 1/2 wavelength distance between drivers, that's also the point where the bass driver is in 1/2 wavelength dipole mode.
I'll be using active DSP of course.

I'm sure these will have satisfying bass extension for the nearfield.

KyleinCowichan 10th December 2012 07:07 PM

Hello,

So the drivers are in cylinders with the 1/2" slits. Are the backs open? At first I thought the right-most object in the drawing was a computer tower.

At the very least they are going to be cool looking!

KM

Melo theory 10th December 2012 07:37 PM

Haha! Yeah does resemble the tower :)
I guess I should have made them a different color.
No, the backs will be closed.
Thanx!

dewardh 10th December 2012 09:20 PM

I had (still have, somewhere) a pair of Monsoon planar dipole computer speakers. Very "clean" sounding (was always tempted to try them in a "real" speaker, but haven't so far), but serious interaction with the desktop really compromised performance. You'll need to watch out for that . . .

tomtom 10th December 2012 09:30 PM

I was thinking about exact same thing some time ago. I want use table desk as baffle for bass speakers /just holes a speakers mounted from bottom/. Plan was attach them to the wall with some adapters and just seal the hole with something soft to reduce vibration to desk. Sort of Linkwitz Orion mounting.
Off course in this case XO must be lower /cca 300/

Melo theory 10th December 2012 10:04 PM

Quote:

Originally Posted by dewardh (Post 3279358)
I had (still have, somewhere) a pair of Monsoon planar dipole computer speakers. Very "clean" sounding (was always tempted to try them in a "real" speaker, but haven't so far), but serious interaction with the desktop really compromised performance. You'll need to watch out for that . . .

How the heck do those little planars get down low enough to cross over to a sub?
with a 103db output they say? hmmmm.

Well, i'm sure these will interact less with the desk and such than typical box speakers.
Anyway, they don't have to be used on the desk.
They could be used as monitors with stereo subs

Melo theory 10th December 2012 10:06 PM

Quote:

Originally Posted by tomtom (Post 3279373)
I was thinking about exact same thing some time ago. I want use table desk as baffle for bass speakers /just holes a speakers mounted from bottom/. Plan was attach them to the wall with some adapters and just seal the hole with something soft to reduce vibration to desk. Sort of Linkwitz Orion mounting.
Off course in this case XO must be lower /cca 300/

You would have to make sure you are leaning over the desk or you will be in the dipole null. Oh, and watch your elbows! :D

studiotech 11th December 2012 01:09 AM

Just watch out for the nasties at 16KHz on the RS100. I will interested if you can still detect any metallic edge or harshness once EQ'd flat on axis.

I still have the original Monsoon planar desktop system. I love it. Very smooth sounding.

Greg

Melo theory 11th December 2012 01:30 AM

Hey, studio. the ambiopole isn't ready yet. if you read the Supernova thread, you will see I'm having problems so, I'll let you know when it's time to come listen :)

I already have these drivers, they sound really good.

http://i167.photobucket.com/albums/u...son/photo5.jpg

http://i167.photobucket.com/albums/u...son/photo6.jpg

I also have the 8 inchers from a project I never started.

dewardh 11th December 2012 01:32 AM

Quote:

Originally Posted by Melo theory (Post 3279418)
Anyway, they don't have to be used on the desk.

That's kinda parta the problema . . . they depend on the desktop for mid-bass reinforcement. Lift them up in "free air" like a monitor and they get kind of thin . . . bit of a hole between the panels and the "sub" woofer. Add a ND-105 or something like it, though, and . . .

Next lifetime . . .


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