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Old 11th July 2013, 12:55 AM   #201
xrk971 is offline xrk971  United States
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Do you have drawing with full dimensions of the 115BK?
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Old 11th July 2013, 01:19 AM   #202
freddi is offline freddi  United States
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just this side view - the vent is centered in the upper panel - the front is 27" tall by 20.5" wide. The wings are radial arc with a starting gap which in production varied from 1/4" to nearly 3/4" (might have been due to the way the wings inset into the sides.

FWIW - 115BK has a pretty smooth graph even without any damping material. It must be derived from the Karlson X15

the two inch gap at the top of the diagonal baffle goes the full 19" internal width of the cabinet.

http://img490.imageshack.us/img490/9...bkside1sr4.jpg

here's my 115BKs - they were well made but simpler than the KK-Audio version. Ernest Beck's version of the Transylvania Power cabinet
seemed to have around a 4"x4" vent

a 3/8" diameter bolt runs through the whole cabinet to brace the wings, port panel and back. Alan Zintz indicated if the wings weren't braced
then there could be some modulation issues in the midrange
Click the image to open in full size.

Last edited by freddi; 11th July 2013 at 01:34 AM.
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Old 11th July 2013, 01:27 AM   #203
freddi is offline freddi  United States
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4-115BK side-by-side should make a fun little bass guitar rig - also Metro's T15 Karlson with the foldback "stub". 115BK scaled a bit larger may make a nice "118BK" about the bulk of K15 - dunno it there would be advantages or not (?)

Last edited by freddi; 11th July 2013 at 01:36 AM.
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Old 11th July 2013, 01:54 AM   #204
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SigmaPro18A2 did not work too well for me in K15 size.
Would not burn wood on that project unless you gonna
go taller.

Not that it didn't "work" down to pretty low, just that
lost all the Karlson kick in the chest and magic smoke...

---

My Kramer has been restrung AEADGB 75554. Every
string moves down one, littlest string thrown out, and
one stolen from a bass added to the top. The big one
from a 7 string just wasn't thick enough to work right...

I was very fortunate the Floyd Rose on that one had
extra holes tapped to move the intonation wayy back.

I don't own one of those rare aluminum necks. Some
previous owner broke the headstock and re-glued it.
None the less, the old Kramer plays good, through the
SigmaPro18A2 K15, but was better with DeltaPro12...

Last edited by kenpeter; 11th July 2013 at 02:07 AM.
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Old 11th July 2013, 02:01 AM   #205
freddi is offline freddi  United States
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I had some Eminence 18s with lower q and less mass than Sigma that still had a little kick - but in general, I'd agree a good 15 would be better. How hard could the Pyle/Eminence 12" PYM1298 be pushed in K15 without excessive excursion occurring?
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Old 11th July 2013, 06:51 AM   #206
freddi is offline freddi  United States
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another thing I'd like to see on a K12 is its response when the vent is plugged. I've run a DVC MCM 12"in a sealed K12 - its a nice woofer and I'll probably give it a run as a helper woofer with a pair of K8.

with the cabinet having minimal damping material as seen below, Qtc = 1.05 .

price ~$46 http://www.mcmelectronics.com/product/55-1465

Poly treated paper cone
Rubber surround
Stamped steel basket
2" voice coil
42.6oz. magnet

Specifications::
Power Capacity: 100W/200W RMS/peak (per coil)
Sensitivity: 93dB (W/M)
Impedance: 8ohm (per coil)
Re: 5.8ohm (per coil)
Le: 0.59mH (per coil)
Frequency response: 25Hz~3KHz
Fs: 25Hz
Qts: 0.30
Qes: 0.32
Qms: 3.13
Vas: 203.81 (liters)
Xmax: 5.0mm


mic on the floor and about 20 inches back from the cabinet
Click the image to open in full size.

some years ago I graphed a K12 with an Eminence woofer suitable for sealed box - here's the effect of the stock vents open
vs closed. How should one view the difference at 300Hz? (-does the rear wave fill that area in when the vent is open? - where is the best location of the vent for smoothest response?)
Click the image to open in full size.

Click the image to open in full size.
Click the image to open in full size.

Last edited by freddi; 11th July 2013 at 07:06 AM.
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Old 13th July 2013, 05:52 PM   #207
xrk971 is offline xrk971  United States
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Default 0.53X Scale Karlsonator Build w/ Dual TC9FD's

Quote:
Originally Posted by xrk971 View Post
Upon looking at the physical dimensions required to fit a couple of TC9FD's on the front, it looks like the cabinet has to be scaled to 8/15 or 0.53X. This makes the angled driver mounting baffle plate 7.5 inches tall and the drivers are 3.52 in wide a piece - so they just fit in there. It appears the mid-range performance is improved as well. The cabinets are now about 9 in wide x 9.4 in deep x 16.4 in tall - still fairly small. One nice thing is that the driver cone excursion appears to be fairly well controlled. A similar MLTL box that achieves about the same SPL and bass range at 3 m will exceed the driver's xmax of 2.5 mm in a hurry. This could be a fun build in either XPS insulation sheathing foam or even in foam core boards for a fun mini Karlsonator.

Take the plan from:
Click the image to open in full size.
and scale all dimensions by 0.53X and it should produce results similar to the plots below.
I finally found some time to actually cut foam and build something! Here is the foam core 0.53X Karlsonator with dual Vifa TC9FD's. All I can say is WOW!!! They sound fantastic! The punch on the kick drums is really something. They are very efficient (loud) at distance away and the dispersion is really good. What I am also noticing is that there is a lot less driver cone movement compared to the other cabinets I have used. Although this is a very compact cabinet at 8 in wide x 8.5 in deep x 15 in tall - the volume of the sound is amazing. Now I know why Karlson's are special: they deliver very clean tight bass that sounds very natural and easy.

I highly recommend this build. Easy to make, inexpensive, and they sound great!
Attached Images
File Type: jpg Karlsonator-1s.jpg (503.7 KB, 312 views)
File Type: jpg Karlsonator-3s.jpg (489.5 KB, 321 views)
File Type: jpg Karlsonator-5s.jpg (426.7 KB, 4388 views)
File Type: jpg Karlsonator-6s.jpg (399.8 KB, 1919 views)

Last edited by xrk971; 13th July 2013 at 06:02 PM.
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Old 13th July 2013, 06:34 PM   #208
zman01 is offline zman01  Bangladesh
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Well, another nice looking foamcore build xrk971!

Can't help it any more - need to build one of these! The driver I have in mind is the Alpair 12 Metal - specs are:

Fo= 46 Hz
Sd= 143.14 Cm
Vas= 22.8 Ltr
Cms= 0.750 MM/N
Mmd= 14.886 g
Mms= 15.871 g
BL= 8.752 T.M
Qms= 1.454
Qes= 0.420
Qts= 0.327
Levc= 0.058m H
No= 0.493 %
SPLo= 89.3 dB
Xmax= 9mm (1 way)
Pwr cont= 50 watts

Can you please give me some pointers on the box volume?

Also have a pair of woofers for which I haven't got boxes yet:

R(e)=6.1 Ohms
F(s)= 26.24 Hz
Qts=0.383
Qes:0.503
Qms-1.604
L(e)=0.471
VAS= 220 litres

Would these work in a Karlson cab as helper woofers?
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Old 13th July 2013, 06:46 PM   #209
xrk971 is offline xrk971  United States
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Zman,
Thanks! This was a very fun box to make. For your A12 you might want to make a fullsize Karlsonator. Let me run the simulation and see how it looks. It might work in a K15 cabinet. The woofer you have, I need the Sd or diam of the cone and surround half depth to estimate Sd. The Qts value looks like it should work in a K15.
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Old 13th July 2013, 07:10 PM   #210
freddi is offline freddi  United States
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good grief - if yer gonna build a K15 then make the cutout for a 15 then use adapter boards or rings to step down to smaller drivers. The smallest driver I heard of in K15's production day was a 10" - sometimes a Hartley.

I'm wondering what might work well for the Alpair 12P - is it too mellow to balance well in a K. Would the Karlsonator 6 work? -- Karlsonator 8? GB has plans for both.

LUV that Foam build !!! - is that a brace strut for the wings which appears above the top driver?

Last edited by freddi; 13th July 2013 at 07:23 PM.
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