Ok, i'm starting this project tomorrow.
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.
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.
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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/
Off course in this case XO must be lower /cca 300/
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
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!
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 . . .
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
Alright. You may have to stop here first. AJ from Soundfield Audio was here last weekend and we speaker geek'd all day. He brought his prototype 1812 to compare in my room. I keep forgetting to check your thread because I generally stay clear of the fullrange forum.
I assume you've seen VV's thread about the dipole desktops?
Greg
Are you talking about gainphile?
These?
Gainphile: S11 OB - Desktop Open Baffle with Seas 8" and Tangband Full-range
I've always wanted to try this method of soaking up the rear wave with foam and let the dipole cancellation do it's job.
Everybody is hot on SL's and John k's offerings so I thought it was time to give this one a go...and I already have the drivers, wood and the mini-dsp so it's a free build
I'm not sure I can bring that 7 1/2' tall speaker to orlando. My flat bed truck is out of gas
These?
Gainphile: S11 OB - Desktop Open Baffle with Seas 8" and Tangband Full-range
I've always wanted to try this method of soaking up the rear wave with foam and let the dipole cancellation do it's job.
Everybody is hot on SL's and John k's offerings so I thought it was time to give this one a go...and I already have the drivers, wood and the mini-dsp so it's a free build
I'm not sure I can bring that 7 1/2' tall speaker to orlando. My flat bed truck is out of gas
Here:
]OB for nearfield PC listening
I thought he stopped by DIY sometime too, but it all runs together after a while.
No need for a flatbed, just for checking out my system and over at the studio.
Greg
]OB for nearfield PC listening
I thought he stopped by DIY sometime too, but it all runs together after a while.
No need for a flatbed, just for checking out my system and over at the studio.
Greg
Hey Deon, I hear what your saying but I'm not trying to get a cardioid response, I'm just going to try and attenuate the beaming rear frequencies, the ones that wouldn't make it around the baffle anyhow.
I still want the dipole null at the sides.
If that's what you were saying. Now that I look at your reply again, maybe you weren't saying it was a cardioid.
I don't know, I can't tell
I still want the dipole null at the sides.
If that's what you were saying. Now that I look at your reply again, maybe you weren't saying it was a cardioid.
I don't know, I can't tell
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For a quick trial, simply keeping the nude drivers upright (by some support under the magnet) and facing you on the desk, you're ready to go.
Within the reach of an arm, you'll be suprised how good they sound in such a simple way. Of course EQ is needed, but compared to far field listening, the bass response in such a near distance would be acceptable under much less EQ. And, you'll probably forget those problems about dipole, cardioid, null... etc and enjoy the music, hehe... I did.
Have fun
Within the reach of an arm, you'll be suprised how good they sound in such a simple way. Of course EQ is needed, but compared to far field listening, the bass response in such a near distance would be acceptable under much less EQ. And, you'll probably forget those problems about dipole, cardioid, null... etc and enjoy the music, hehe... I did.
Have fun
I keep forgetting to check your thread because I generally stay clear of the fullrange forum.
Greg
Yeah, I'm the naughty boy over there for using fullrangers in multiples and implementing DSP instead of passives
I wish I could have posted my last few builds on this side, they may have caught more interest
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