OGIaudio - True Ribbon - Full Range

[OGIaudio]

Hello friends!

I uploaded photos for you again, on this server they will stay at least 10 years

 

[HankF]

Interesting work - I wish you success.

 

[DeltaStar]

Hi, Is that a double or single ribbon in the gap? also do you have it damped with foam to control resonances? is the ribbon of a spring type, or flat over it's length? I presume by looking at pic, it's not kapton backed, but a foil only. Looks like a MRT with disfraction panels on each side, probably good for 200hz up. Al

 

[OGIaudio]

Thanks Hank!

Single flat ribbon, only foil, space behind is damped
This is old version, last 8 years I work on the new

 

[audiomagnate]

That's what I call a minimalist system. How low do they go now?

 

[OGIaudio]

New ribbon is 20x2300mm, magnetic gap is 24mm
Heavy peace of hardware
It goes lower than any subwoofer I had in my room

 

[john65b]

It goes lower than any subwoofer I had in my room

Forgive me, but either you are defying rules of physics, or your sub cannot go lower than 200hz....

I really want to see this!!

 

[OGIaudio]

I had many powerful subwoofers which shake floor under foot, open doors, broke windows... but they didn't sound deep in my room, they sound more like some working machine
Anyway, you are right, there is acoustic shortcut and everything connected with that
I have big ribbons with big panels and overall result is better in 20-200Hz range
There is no secret reason for that, the same and better result I can get in sub range with classic drivers and panels

 

[audiomagnate]

Maybe that ribbon could go down into the 20s mounted in an infinite baffle and at moderate levels, but it doesn't have the surface area required to move any significant amount of air. I think we're being trolled here, and for nine years to boot!

 

[OGIaudio]

Surface area is not so small, 460cm2 per channel
You asked how low and my answer is low and loud enough, for me in my home conditions
Hope that means something to some of you
Unfortunately I still can't show any measurement or new photos so yes, maybe is better not to talk about this for now

 

[lcsaszar]

Hi OGI,

Is the diaphragm stretched? Have you experienced any dilatation effect (expanding/shrinking due to temperature change)? How sensitive is it to draft in the room? Is the V-shaped baffle for aesthetical reason only, or has this shape any function vs a flat baffle? Nice piece of work, I especially like the small footprint...

 

[OGIaudio]

Thanks Oshifis!

Yes, it's stretched but not strong
No problem with temperature change

How sensitive? You mean how hard is to make diaphragm?
It's not problem, replacement also

Baffle is like that to reduce resonant problems
Anything symmetric and repetitive is worst possible in acoustic
It's important that distance between diaphragm and end of baffle is not the same vertically on both sides

 

[lcsaszar]

Thanks for the information. I wanted to ask what happens if you open the window and the door, and "wind" sweeps across the room... And did you measure the resonant frequency of the loudspeaker?