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New sub design? Constricted Transflex, simple build (series tuned 6th order)
New sub design? Constricted Transflex, simple build (series tuned 6th order)
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Old 13th July 2018, 06:21 AM   #2091
freddi is offline freddi  United States
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New sub design? Constricted Transflex, simple build (series tuned 6th order)
power handling with Kappa12a should not be an issue in home use. Do initial sims look strong enough for some pro use?
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Old 21st July 2018, 09:52 AM   #2092
Matthew Morgan J is offline Matthew Morgan J  United States
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Smile Akabak Dabbling

Quote:
Originally Posted by freddi View Post
power handling with Kappa12a should not be an issue in home use. Do initial sims look strong enough for some pro use?
Freddi ,
I would say so yes


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Originally Posted by freddi View Post
that's quite a complex script - as its a bit larger than the "X15"
The K-slot required a great deal of code (the latter portion of the script) , the rest of cabinet didn't require much code ...


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Originally Posted by freddi View Post
will some lowr qts 15 fit the same cabinet you're working on?
Freddi,
Yessir, i would just adjust the width so that a 15" driver will fit ...... If you would rather go with a 15" just let me know which model and i will plug it into the script
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Old 22nd July 2018, 02:34 AM   #2093
freddi is offline freddi  United States
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New sub design? Constricted Transflex, simple build (series tuned 6th order)
MMJ - which do you think would make the overall more interesting project 12" or 15" ? I don't think either my JBL M151 or 2035H are current drivers.

(btw - you're a mighty-mighty-man to work out that damned K-slot)

M151 , being a guitar speaker, is pretty lively - its either that or Kappa 12a (it might
be more interesting to see what can be extracted from Kappa12a)

Def_Driver "JBL M151" |15 inch woofer Xmax 5mm Qts 0.25
Sd=880cm2
Fs=45Hz
Mms=70g
Qms=2.8
Qes=0.27
Re=4.8
BL=18.8
Le=0.72mH
Vas=198.2L

Last edited by freddi; 22nd July 2018 at 02:39 AM.
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Old 23rd July 2018, 01:06 AM   #2094
freddi is offline freddi  United States
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New sub design? Constricted Transflex, simple build (series tuned 6th order)
It would be interesting if a 15 inch version can offer a good alternative to the original 15 inch Karlson enclosure (and GregB's "Karlsonator" spinoff. (-the original Karlson can outperform some horns imo - - Cogent's Steve Schell feels that way too)
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Old 26th July 2018, 02:13 PM   #2095
brookhart995 is offline brookhart995  United States
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Default How much stuffing?

I am building 4 of the 15” version from post #932. I have summed the Dayton PN395-8 Neo drivers and the simulated response looks very good using the Hornresp inputs from that same post by TB46 (#932). I already have the drivers which also sim well in the THAM-15. I have two questions: 1. How much and where should I put stuffing inside the enclosure, 2. In the drawing, there is an angled piece near the mouth that is drawn with dotted lines. Is that piece required and/or how critical is it to the response?

Here is the driver, if your not familiar with it.

Dayton Audio PN395-8 15" NEO Series Pro Woofer with 4" Voice Coil 8 Ohm

Thanks all!
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Old 26th July 2018, 02:45 PM   #2096
Matthew Morgan J is offline Matthew Morgan J  United States
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Quote:
Originally Posted by freddi View Post
MMJ - which do you think would make the overall more interesting project 12" or 15" ? I don't think either my JBL M151 or 2035H are current drivers.
I think either one would be interesting and worthwhile

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Originally Posted by freddi View Post
(btw - you're a mighty-mighty-man to work out that damned K-slot)
Hehehe, awwwe shucks I can't take the credit though because back in the days i believe i had guidance from XRK and it still took me some time to figure out how to script the slot ...It probably isn't exactly perfect but close enough i think ...

Quote:
Originally Posted by freddi View Post
M151 , being a guitar speaker, is pretty lively - its either that or Kappa 12a (it might
be more interesting to see what can be extracted from Kappa12a)

Def_Driver "JBL M151" |15 inch woofer Xmax 5mm Qts 0.25
Sd=880cm2
Fs=45Hz
Mms=70g
Qms=2.8
Qes=0.27
Re=4.8
BL=18.8
Le=0.72mH
Vas=198.2L
Freddi, if you would like to go with this M151 it is no problem , i will plug in the parameters and adjust the cabinet's width ......If you would like to stick with the Kappa 12a that is fine too , just let me know ......
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Old 26th July 2018, 04:46 PM   #2097
freddi is offline freddi  United States
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New sub design? Constricted Transflex, simple build (series tuned 6th order)
lets go with the 12a as its in production. For a given cabinet volume, cutoff, a 12 has to do some work to equal the 15's displacement. Karlson "X15" was one cubic foot larger than his K12, similar Lf, but the 15's excursion was less.

Last edited by freddi; 26th July 2018 at 04:49 PM.
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Old 26th July 2018, 05:19 PM   #2098
freddi is offline freddi  United States
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New sub design? Constricted Transflex, simple build (series tuned 6th order)
Brookhart995 - depending upon what low end you need - MMJ might suggest a higher tuned Karlflex

here's a fudged 115BK Karlson type vs TB46's Karlflex


Click the image to open in full size.
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Old 26th July 2018, 05:30 PM   #2099
brookhart995 is offline brookhart995  United States
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That’s a good response, can you point me to a drawing of that box for a 15” driver?
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Old 26th July 2018, 05:46 PM   #2100
freddi is offline freddi  United States
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New sub design? Constricted Transflex, simple build (series tuned 6th order)
I don't know if 115BK would go as deep as that sim (?) - here it is with an EVM15L outdoors with mic laying on the ground

ah - here's a 2 pi sim of 115BK with PN395-8 vs EV15L - as these little K move towards free space, the cavity peak looks more pronounced - hopefully a 3rd chamber can help some cases. That fudge looks closer than some Akabak sim done on Karlson

115BK makes a good midbass horn substitute for some cases and sounds good with a slotted pipe Karlson tweeter.

PN395 sims very nice in Jim Bell's SS15 cabinet


Click the image to open in full size.


115BK's internal width ~19" - external 20.5"


Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

there was no damping material in that 115BK

Click the image to open in full size.

Last edited by freddi; 26th July 2018 at 05:58 PM.
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