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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 11th October 2017, 05:47 PM   #1091
freddi is offline freddi  United States
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Default "HAK"

here's one of Carl Neuser's earlier "high aspect Karlson" textboxes. Details were removable so different ports, port position, rear lowpass gap, tapers, front shelf deflector and front chamber reflector could be evaluated. Carl is a stanch proponent the curved reflectors per the final installment of Karlson's "Acoustic Transducers" patent.

With my crude HAK8 , similar in bulk to a Karlson12 and both loaded with W8-1772, the skinny, taller box had 2-5dB less output in the 110-220Hz region than Karlson's 1954 K12. What might be the reasons for that observation?


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Old 11th October 2017, 07:11 PM   #1092
xrk971 is online now xrk971  United States
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A Speaker that Kicks Butt in Large Spaces
Was volume the same? A larger volume box will have lower output in midbass.
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Old 11th October 2017, 08:01 PM   #1093
freddi is offline freddi  United States
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yes - pretty much the same volume between the HAK8 and the old Karlsonette K12. It was like the normal aspect K12 emphasized the 110-220 hit region more.
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Old 11th October 2017, 08:28 PM   #1094
xrk971 is online now xrk971  United States
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A Speaker that Kicks Butt in Large Spaces
Does the HAK have deeper bass extension? It's longer path length could be making behave more like a TL vs a 6th (or 8th) order bandpass alignment.
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Old 12th October 2017, 08:33 AM   #1095
freddi is offline freddi  United States
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with the horizontal port right above the speaker, my HAK8 didn't seem to have a real LF advantage over the K12. I can't remember how careful I was with regards to having both cabinets in the same spot (and same with mic placement) I've not played with that cabinet since cutting a 3" hole near the top of the slant board. An initial impedance plot looked very odd with my AN8. I'll try the W8-1772 which is still limber. Nirvana's surround goop seems to dry, stiffen and raised fs by a half octave from ~41 when first got the speakers to the mid 60's. (That's another plus for FE206EN)

It might require a short duct on the 3" hole to tune things for the HAK8 (?) - where do you think I should set tuning? 60? - lower ?
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Old 13th October 2017, 06:22 PM   #1096
freddi is offline freddi  United States
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Default TwoGoodEars K15 blog

TWOGOODEARS - トゥーグッドイアーズ: A well-spent day: the making of a Karlson bass enclosure pair
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Old 16th October 2017, 06:22 AM   #1097
freddi is offline freddi  United States
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Question for xrk971. If one is to use Mark Audio's Alpair 12P in a K - Which K suits it best overall? Would it be a Karlsonator? How would it play in GregB's Karlsonator6 which has Fb ~60Hz? Would it be lost in a stock Karlsonator8? What can be done with the original K concept ? How about a well thought out XKi ?

Def_Driver "ALpair12P" | ~6.5 in. Full Range driver from Mark Audio
Sd=147.41cm2
Fs=42.15
Mms=10.217g
Qms=1.981
Qes=0.333
Re=7.000
BL=7.540T-M
Le=0.054mH
Vas=43.060L
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Old 16th October 2017, 04:02 PM   #1098
xrk971 is online now xrk971  United States
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A Speaker that Kicks Butt in Large Spaces
Quote:
Originally Posted by freddi View Post
Question for xrk971. If one is to use Mark Audio's Alpair 12P in a K - Which K suits it best overall? Would it be a Karlsonator? How would it play in GregB's Karlsonator6 which has Fb ~60Hz? Would it be lost in a stock Karlsonator8? What can be done with the original K concept ? How about a well thought out XKi ?

Def_Driver "ALpair12P" | ~6.5 in. Full Range driver from Mark Audio
Sd=147.41cm2
Fs=42.15
Mms=10.217g
Qms=1.981
Qes=0.333
Re=7.000
BL=7.540T-M
Le=0.054mH
Vas=43.060L
Hi Freddi,
I ran this sim a long time ago - yes, a 0.67x scale Karlsonator is best for the A12P. It will get about 93dB sensitivity and F3 of about 48Hz.
X
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Old 16th October 2017, 08:16 PM   #1099
freddi is offline freddi  United States
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another kuestion - for a given lower Q driver and regular K as in the form of 115BK, what changes to the original scheme could help tame a peak which can occur? (see area in red oval) - does one add a resonator to the front chamber?

https://i.imgur.com/YZemfus.jpg

oddly, its not noticeable with 115BK indoors - or my KK-audio boxes with EV15B - and the bass, although high cutoff, does
not sound "hollow" when a K-tube treble is added to the little 4.3 cubic foot K-box
Click the image to open in full size.


that peak can get out of hand sometimes - kinda weird - it doesn't sound crazy in a slit vent K12 either
loaded with old spec B102 ( that driver measures Qts ~0.23)

Last edited by freddi; 16th October 2017 at 08:24 PM.
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Old 17th October 2017, 04:18 AM   #1100
freddi is offline freddi  United States
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- wonder how accurate this sim comparison is overall ? - two K cabinets - one is TB46's version of MMJ's Karlflex at 73L. The other, Acoustic Control's 115BK, both with 2035H

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