DIY full-range line-source speakers with 25x 3" drivers per channel:
Kii Three before and after Audiolense correction. No acoustical treatment other than furniture and carpets.
Really cool. Can you share make and model for the driver used?
Cabinet is rear ported?
How does it sound? What are you driving them with?
Visaton FRS8M (follow link for specs)
Sealed enclosure, partitioned for every 5 drivers.
What shall I say, very even and balanced, solid, wide and deep sound stage, images appear at the appropriate height, extremely wide sweet spot, no matter if seated, standing or crouched on the floor, only the lowest octave is MIA.
Owned the absolutely gorgeous sounding Magneplanar Tympani4A for a long time, which I had to part from due to relocation, but their only advantage was the ribbon tweeter.
Enough said, I’m very happy with what I have now!
Click my avatar for further system details…
Why do you look at funny graphs with a view like that?
Measured today at listening position. REW + UMIK-1
1/3 scaling. No room correction. No EQ.
Lumpier than I want. More work to do.
Reviving this topic after playing around with REW’s new inversion correction method, as introduced by @OCA - thanks again for the intro!
Sounds are a little more precisely placed on the stage, everything seems a bit clearer and more natural than with the old moving-mic method.
Thank you for reviving the topic…
Here is my Left+Right (FDW 35, physcoacoustic smoothing):
And phase response of L+R before & after correction:
Btw REW has just launched the final, non-beta version with inversion (V5.20.13) on the AV Nirvana website.
For reference there’s a discussion in Roon with lots of information about the technique here:
I’d redone mine again after installing the new version.
Adding my impulse and step responses also, where the time domain correction effect can nicely been seen.
EDIT: Let me add phase responses just for completeness…
The measurements are epic. I am starting to get real jealous about your DIY speakers.
BTW, to get rid of latency in relation to other grouped zones - uncurable with Roon’s DSP tools - I had to shorten the left window in the impulse response menu for the inverted minimum phase correction responses to like 21us, just before the step rises from 0%, and use a rectangular window.
This doesn’t seem to degrade the correction audibly and visually.
Exactly and that’s why you should export impulse responses with “IR Windows” option ticked!
Yessir, sure thing!
Yeah sod the graphs when you can just look out of the window
Where do you live? That is stunning and I am very very jealous.
Thanks! Can’t complain, neither of the view or the sound of the Kii Three’s. We live in Bodø, a small town up north in Norway. And thanks for the reminder, it’s about time to make some new measurements of the speakers.
Now thats strange , one of my other pastimes is playing Football Manager on the PC and I once managed Bodo/Glimt . Thats completely off topic but a nice coincidence.
@OCA is careful and meticulous!
By following his advice I have come to produce a noticeable correction.
Below images with different smoothing: