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A Speaker that Kicks Butt in Large Spaces
A Speaker that Kicks Butt in Large Spaces
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Old 21st May 2017, 06:00 AM   #1011
freddi is offline freddi  United States
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haha - that's where we could use some FEA modeling - whats the board above the baffle look like in your little K ?

Hey X - since K's usually excel on guitars - start around 1:44 in this video to get past the talk
https://www.youtube.com/watch?v=RjjmutHRs44

Last edited by freddi; 21st May 2017 at 06:22 AM.
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Old 21st May 2017, 06:55 AM   #1012
freddi is offline freddi  United States
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how does it do on the Siena Pianoforte ? (a wonderful instrument) https://www.youtube.com/watch?v=wadANaPrmjg
Click the image to open in full size.

Last edited by freddi; 21st May 2017 at 07:00 AM.
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Old 21st May 2017, 08:16 AM   #1013
xrk971 is online now xrk971  United States
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A Speaker that Kicks Butt in Large Spaces
I think it actually sounds pretty good playing back guitar. The attack and dynamic range is quite nice. From listening, I would guess it goes down to about 100Hz.

Here is a recording of the classical/flamenco guitar video you linked.

Change extension from .asc to .mp3 to listen.
Attached Files
File Type: asc Kurvy-K-guitar.asc (1.58 MB, 15 views)
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Old 21st May 2017, 02:17 PM   #1014
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Well done X. I pop off to church on sunday morning and when i come back all this interesting news is here. I should have realised something was up when you commented on the TC9FD 0.4 karlsonator.
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Old 21st May 2017, 04:51 PM   #1015
freddi is offline freddi  United States
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that recording of Kurvey-K3 with guitar has good dynamics and tonality - just a bit lacking on the low end

perhaps someone will try Kurvey with larger drivers
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Old 21st May 2017, 09:58 PM   #1016
freddi is offline freddi  United States
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hey X - are you going to present Kurvy-K as a fullrange project ?
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Old 21st May 2017, 10:02 PM   #1017
xrk971 is online now xrk971  United States
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You mean give details on internal dimensions etc? There is not much to say other than it's a direct scale-down per driver nominal size and I simply reduced the front chamber volume by curving the aperture all the way to where the top board with the vent meets the top panel.

I think it will work well with a larger driver like a 12in coax.
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Old 21st May 2017, 10:25 PM   #1018
freddi is offline freddi  United States
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well - you might post it separately with a brief discussion - regarding 12cx version - do you think the 1956K12 style most appropriate ?

would it be kinda like so ? - the way I crudely did this, there isn't a lot of front chamber volume reducitno. I don't know what's "optimum" for some 12CX

Click the image to open in full size.

Last edited by freddi; 21st May 2017 at 10:29 PM.
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Old 21st May 2017, 11:51 PM   #1019
xrk971 is online now xrk971  United States
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That's basically it but mine started tangent to the vertical from the bottom front. Not a big deal and I have no basis for reducing front chamber volume other than to allow curve to work. Reducing front chamber volume loads the cone more for higher SPL actually. But having a curve on a small full range driver makes a difference.
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Old 30th May 2017, 02:33 PM   #1020
hoyungh is offline hoyungh
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Freddi about the FE206EN the manufacturer recommended a 45 lit bass reflex enclosure. the equivalent K will do 50Hz . the existing 0.6 k you have has a bass reflex vol 22.5 lit and do 70hz.
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