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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 4th July 2013, 07:44 PM   #181
freddi is offline freddi  United States
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A Speaker that Kicks Butt in Large Spaces
here's the tuning for the K6.5 vs a factory K8 and Welter's "K8" with 6 large slit vents

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Old 6th July 2013, 04:15 AM   #182
xrk971 is offline xrk971  United States
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A Speaker that Kicks Butt in Large Spaces
Default Tiny Dual 3.5 inch Drivers with 0.33X Scale Karlsonator

Just for grins, I wanted to see what happens if I were to take the Karlsonator and scale it by 0.33X in all dimensions and put two small 3.5 in Vifa TC9FD (high Qts) drivers that I use for my other projects. The resulting cabinet is indeed very small ('cute' and 'bookshelf' comes to mind) - about 5.1 in wide x 5.4 in deep x 10 in high (all internal dims). The speakers are assumed to be placed against a wall and the measurement is at 3 meters away. At 2.83V into 4 ohms parallel load, I get a solid 90 dB bass shelf from 80 Hz to nearly 300 Hz. There is a big hole 350 Hz to 800 Hz, which may improve with stuffing inside to prevent the end reflections. Anyhow, I am surprised how well this can throw a solid punch at 3m. The second plot is the impedance, third plot is cone displacement, and fourth is polar plot of 80 Hz, 200 Hz, and 1500 Hz. Note the very wide dispersion of the 1200 Hz without lobing. The frequencies that are there, when they pass hrough the K-slot, have a very wide uniform pattern (90 deg in this case).
Attached Images
File Type: png Karlsonator-6.5X-Dual-TC9FD-Freq-3m.png (30.0 KB, 748 views)
File Type: png Karlsonator-6.5X-Dual-TC9FD-Impedance.png (25.4 KB, 737 views)
File Type: png Karlsonator-6.5X-Dual-TC9FD-Displ.png (25.6 KB, 717 views)
File Type: png Karlsonator-6.5X-Dual-TC9FD-Polar-3m.png (19.5 KB, 726 views)
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Old 6th July 2013, 04:30 AM   #183
freddi is offline freddi  United States
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A Speaker that Kicks Butt in Large Spaces
interesting - maybe you'll come up with new small Ks that can punch, disperse and play smooth. Would the K6.5 with the wide aperture as I have in the plan, exhibit good performance with a FE166EN? - with the de-whizzered 164, it sounds "deep" and off axis timbre (with helper tweeter on top to fill) seems good at 90 off horizontal in the voice overtone range - it seems more mellow than some of K's

k6.5 plan https://plus.google.com/photos/10054...49816297868412

K6.5 tuning with a FE164
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k6.5 test box with FE164
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Last edited by freddi; 6th July 2013 at 04:34 AM.
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Old 8th July 2013, 12:17 AM   #184
freddi is offline freddi  United States
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A Speaker that Kicks Butt in Large Spaces
when making new small effective K-coupler - what is the best front chamber shape and how does air mass distribution in that chamber matter?

consider these two couplers for 6 inch speakers - as one travels from the speaker up, the chamber cross-section of the Karlsonator 6 is tapering downwards while the HAK6 is getting larger - up to a point.

I think in practice that both approaches will make a good system.

Karlsonator 6
https://plus.google.com/photos/10054...49816297868412

HAK 6
https://plus.google.com/photos/10054...49816297868412
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Old 8th July 2013, 02:29 PM   #185
xrk971 is offline xrk971  United States
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A Speaker that Kicks Butt in Large Spaces
Default 0.53X Scale Mini Karlsonator with dual TC9FD's

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:
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and scale all dimensions by 0.53X and it should produce results similar to the plots below.
Attached Images
File Type: png Karlsonator-8X-Dual-TC9FD-Freq-3m.png (30.6 KB, 21846 views)
File Type: png Karlsonator-8X-Dual-TC9FD-Imped-3m.png (25.9 KB, 161 views)
File Type: png Karlsonator-8X-Dual-TC9FD-Displ-3m.png (26.8 KB, 84 views)
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Old 8th July 2013, 08:59 PM   #186
freddi is offline freddi  United States
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A Speaker that Kicks Butt in Large Spaces
that's a promising sim for a 0.53 Karlsonator - are there any 5" fullrange which might work well as a single substitute for the side by side 3s?
-- hey X -- what would be the most powerful 12" K for stage work? - does the 115BK work as well with a 12 as K12?

Last edited by freddi; 8th July 2013 at 09:09 PM.
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Old 8th July 2013, 10:40 PM   #187
IG81 is offline IG81  Canada
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I've been eying this inexpensive Celestion 5" for some time...

Celestion Neodymium 5" Full Range Woofer 8 Ohm 299-416

Not quite fullrange and some nasty-looking breakup up there, but there might be something to it.

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Old 8th July 2013, 11:22 PM   #188
xrk971 is offline xrk971  United States
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IG,
I have been eyeing those 5 in Celestions for some time now too. The price is right . I will put it in the Karlsonator model and see what happens. What boxes have you tried them in so far if any?
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Old 8th July 2013, 11:59 PM   #189
IG81 is offline IG81  Canada
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Simulated boxes only, I don't have these. I forget what exactly, probably just simple reflex to check out the capabilities. Ultimately limited by a high Fs, though I'm fully able to enjoy the 115Hz FF85WK on its own.

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Old 9th July 2013, 05:32 AM   #190
freddi is offline freddi  United States
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A Speaker that Kicks Butt in Large Spaces
hey X - will the cheap but cheerful Visaton BG20 which sounds nice in a K12 work in Greg B's Karlsonator 8/BOBO/SuperT@#T?

Karlsonator 8 plan
http://img844.imageshack.us/img844/8281/ga7.png

BG20 at Partsexpress http://www.parts-express.com/pe/show...number=292-548

THIELE-SMALL PARAMETERS
Resonant Frequency (Fs) 38 Hz
DC Resistance (Re) 6.2 ohms
Voice Coil Inductance (Le) 0.80 mH
Mechanical Q (Qms) 3.47
Electromagnetic Q (Qes) 0.51
Total Q (Qts) 0.44
Compliance Equivalent Volume (Vas) 3.88 ft.
Maximum Linear Excursion (Xmax) 2 mm

MATERIALS OF CONSTRUCTION
Cone Material Paper
Surround Material Cloth

MOUNTING INFORMATION
Overall Outside Diameter 8.07"
Baffle Cutout Diameter 7.20"
Depth 3.19"

Last edited by freddi; 9th July 2013 at 05:35 AM.
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