|11th July 2013, 01:19 AM||#202|
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.
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
Last edited by freddi; 11th July 2013 at 01:34 AM.
|11th July 2013, 01:27 AM||#203|
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.
|11th July 2013, 01:54 AM||#204|
Join Date: Nov 2007
SigmaPro18A2 did not work too well for me in K15 size.
Would not burn wood on that project unless you gonna
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.
|11th July 2013, 02:01 AM||#205|
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?
|11th July 2013, 06:51 AM||#206|
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
Stamped steel basket
2" voice coil
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
Vas: 203.81 (liters)
mic on the floor and about 20 inches back from the cabinet
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?)
Last edited by freddi; 11th July 2013 at 07:06 AM.
|13th July 2013, 05:52 PM||#207|
Join Date: Oct 2012
0.53X Scale Karlsonator Build w/ Dual TC9FD's
I highly recommend this build. Easy to make, inexpensive, and they sound great!
Last edited by xrk971; 13th July 2013 at 06:02 PM.
|13th July 2013, 06:34 PM||#208|
Join Date: Feb 2011
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
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:
F(s)= 26.24 Hz
VAS= 220 litres
Would these work in a Karlson cab as helper woofers?
|13th July 2013, 06:46 PM||#209|
Join Date: Oct 2012
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.
|13th July 2013, 07:10 PM||#210|
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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