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XKi - X's ab initio Karlson 6th Order Bandpass
XKi - X's ab initio Karlson 6th Order Bandpass
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Old 25th January 2015, 02:37 AM   #21
freddi is offline freddi  United States
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XKi - X's ab initio Karlson 6th Order Bandpass
well - how good can ya do for Beta8cx ? - its not a huge vas - I think US speaker has wrong spec (?)


http://www.eminence.com/pdf/Beta_8CX.pdf
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Old 25th January 2015, 03:19 AM   #22
xrk971 is offline xrk971  United States
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XKi - X's ab initio Karlson 6th Order Bandpass
Quote:
Originally Posted by freddi View Post
well - how good can ya do for Beta8cx ? - its not a huge vas - I think US speaker has wrong spec (?)


http://www.eminence.com/pdf/Beta_8CX.pdf
It's not too bad - the active volume is only 14 liters and 10in x 1.0in x 15in long vent, so the cabinet is internally 15in high, x 10in wide x 7.5in deep - with 0.5in ply the external volume is 0.85 cu ft. The fb is 62Hz and f3 of 60Hz with max SPL of about 108dB at 17 volts drive.

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Old 25th January 2015, 03:20 AM   #23
freddi is offline freddi  United States
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XKi - X's ab initio Karlson 6th Order Bandpass
it would be almost the same size - a bit smaller than Karlson's Eight/"K8" and about an octave better on the low end.
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Old 25th January 2015, 03:37 AM   #24
xrk971 is offline xrk971  United States
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XKi - X's ab initio Karlson 6th Order Bandpass
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Originally Posted by freddi View Post
it would be almost the same size - a bit smaller than Karlson's Eight/"K8" and about an octave better on the low end.
Well, that's good to know that it performs better than a scaled down K15 or a K8. The K8 probably had better power handling and higher max SPL - although, if I tuned the XKi to 100Hz, it would probably be pretty high too.
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Old 25th January 2015, 03:43 AM   #25
BYRTT is offline BYRTT  Denmark
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XKi - X's ab initio Karlson 6th Order Bandpass
Quote:
Originally Posted by xrk971 View Post
.....W8-1772 should work but I would caution use of any very light mass cone driver as there are substantial pressures involved here that may collapse the cone if a sufficiently high amplitude transient came through.....
Serious talk there .

Did you sweep impedance RS100P sitting in there, or is the pressure not to be seen in such plot.
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Old 25th January 2015, 03:49 AM   #26
freddi is offline freddi  United States
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XKi - X's ab initio Karlson 6th Order Bandpass
most of the FR speakers I see aren't capable of folding up - they will just burn - I was surprised how loud
a Beta12cx played in an X15 cabinet copy - the big taiko transient was so powerful that I expected the cone
to break - but things were fine - it moved less than 1/4" peak to peak. Frequency response wise. one would say
there was no bass - but it caught those upper bass transients which are missed with most blh and reflex.

X - here's a pretty strong (~2% efficient) Sammi in a diy "kinda K8" - fb on K8 ran around 95Hz - K8 was a bit
larger than XRK971's proposed XKi for Beta8 cx

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Last edited by freddi; 25th January 2015 at 03:53 AM.
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Old 25th January 2015, 03:51 AM   #27
xrk971 is offline xrk971  United States
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XKi - X's ab initio Karlson 6th Order Bandpass
Quote:
Originally Posted by BYRTT View Post
Serious talk there .

Did you sweep impedance RS100P sitting in there, or is the pressure not to be seen in such plot.
Yes, I sure did make a sweep with my brand new DATS woofer tester that I got for Xmas

I am just speculating about cone collapse but I do know that there is serious air volume pumping out of the narrow K-aperture.

Here is the RS100P-4 impedance measurement in the little XKi:

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File Type: png XKi-RS100P-Impedance-sweep.png (75.8 KB, 1483 views)
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Old 25th January 2015, 04:32 AM   #28
freddi is offline freddi  United States
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XKi - X's ab initio Karlson 6th Order Bandpass
no discernible front chamber effect upon small signal Z sweep
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Old 25th January 2015, 04:56 AM   #29
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XKi - X's ab initio Karlson 6th Order Bandpass
I will have to remove the front K-aperture and do a sweep to see if there is. There should be.
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Old 25th January 2015, 06:04 AM   #30
BYRTT is offline BYRTT  Denmark
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XKi - X's ab initio Karlson 6th Order Bandpass
Quote:
Originally Posted by xrk971 View Post
Yes, I sure did make a sweep with my brand new DATS woofer tester that I got for Xmas

I am just speculating about cone collapse but I do know that there is serious air volume pumping out of the narrow K-aperture.

Here is the RS100P-4 impedance measurement in the little XKi:
Thanks plot XKi/RS100P, at resonances area stroke looks strait and normal but from 320Hz and all up stroke has very small saw-toot form, could this be the pressure sign or inherent the driver also at free air. Example my A10.2 also have tooth but only 6 from 200-10kHz not those micro tooth all the way.

X, if preferred seems that printing the plot from DATS software can look cleaner than a program capture. Software for DATS miss the smart "Capture" bottom as REW has for creating picture files. A free alternative way is print from DATS to MS XPS file document printer, open this and capture only the plot with MS SnippingTool.exe which can ouput png or jpg files. Attached is a print example of a known Vifa.
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File Type: png DATS.PNG (50.6 KB, 165 views)
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