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Old 21st June 2013, 06:20 AM   #131
freddi is offline freddi  United States
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hi Moray - hope you're feeling pretty good - is that the 2" exit or did you remove an adapter so its 1.4"? BEST, Freddy
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Old 21st June 2013, 07:20 AM   #132
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Hey Freddy: feel like I have turned the corner and am on the mend, thanks. That is with the nose cup on so you are looking at a sideways look at my EV DH1A that is a two inch paper tube you are looking which provide scale to see just how large the DH1A really is 9" in dia over 5" deep and 23.5 lbs of motor capable of outputting a continuous 10 acoustical watts across its full bandwidth 500Hz to 20KHz that three watts more continuous that a JBL 2226 fifteen inch woofer. Will try the driver with the nose cup off as a 1.4 inch exit. I am totally impressed with this driver and ruined for less I am sure.
In the snap shot the tubes are running wit a Heresy 3 (very very modified) woofer crossover is at 750 Hz and I am using a CF3 network to run the DH1A. You would have to experience the visceral impact to believe what this combination can do. You never heard a Cornwall do this. The tubes are at ear level pointing directly at the sweet spot and the K-slot cross fire toward each other so there is no tube radiation toward the two outside walls. Plan to get back at playing with these in a few weeks from now have to concentrate on walking on the new hip and building new muscle tissue. Best regards Moray James.
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Old 21st June 2013, 09:53 AM   #133
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Well, I want to talk for moment about the removable bottom concept.
And sideways shelving. Neither built yet, just the thought experiment.

Even with K15 built traditionally in every other way, bottom seems a
far easier access than through the front or back. There is no room for
tools at the inside bottom or under the frontside shelf. If you take the
bottom off, then tool access for inside mounting is easy allway around.
The bottom panel involves fewer furniture bolts than wings or back,
and it on the bottom, so less pretty screws are an option here too.

If you go in through the bottom, then there is no access penalty for
added bracing to the wings or back. I think front and back shelves can
easily be turned sideways to double duty as bracing... By "sideways"
I mean gaps of same area relocated to the sides, rather than gaps of
no bracing value across the front and back.

When midrange sound comes up around sides of the front shelf,
it crashes back together in a vertical stripe behind the front slot.
I think this may give an exit in fewer passes, for less reverb.

Last edited by kenpeter; 21st June 2013 at 10:08 AM.
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Old 21st June 2013, 10:55 AM   #134
xrk971 is online now xrk971  United States
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Freddie,
I love the idea of a K tube made of paper and tape. I have a soft spot for easy to make speakers that can be cobbled together from common household items. My love of foam core speaker builds is related to this. Do you think a K15 can be made from the pink XPS foam sheets from Home Depot? Perhaps with some strategic use of reinforcement with thin 0.25 or even 0.125 thick plywood on front K aperture and driver mounting panel. I am getting such good sims with the Betsy K and you are saying BG20 works well too I may give it a try one day.
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Old 21st June 2013, 12:26 PM   #135
IG81 is offline IG81  Canada
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Hi Moray James and welcome back!

As for a foam Karlson, it would probably be very colored. There is a lot of pressure going on in these. Even 18mm BB-ply wings in the K12 really need bracing and I'm certain I can get an improvement on the tiny SK8 if I do so. Still, it's an easy experiment and I have not always let technical details and certain flaw detract me from trying stuff.

Smith horns are indeed fun on a Karlson. After the K-Tube, they were second best for me, in front of some CD-waveguides, DIY conical horn and tiny tweeter horn such as EV TW-35, APT:80 or FT17H.

Click the image to open in full size.

IG

Last edited by IG81; 21st June 2013 at 12:29 PM.
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Old 22nd June 2013, 12:50 AM   #136
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Styrofoam Smith horn of the same material you suggest for K15, I've built.
I can say from experience that it looked very cool, but didn't work too well.
Probably just too soft to contain the wave...

I might still build a styroK for a neodymium 12" or 15", but bracing will be
an issue for sure...

Styrofoam Smith Horn

Last edited by kenpeter; 22nd June 2013 at 12:53 AM.
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Old 22nd June 2013, 11:22 AM   #137
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Default Replaceable baffle

This is far more pain than it looks. The wings, back, and driver all
have to be out first, and the bolt locations offer no access for tools.

Yet another reason I think a removable bottom panel makes more
sense than removable wings and back. I could pull the driver and
baffle out in one piece, and tool access would be much improved.
No bolts hidden inside an angle with barely enough headroom to
remove the bolt, much less figure how you get the wrench on it.

I'm saying, never do what you see in this picture! Ain't worth it.
Make the bottom removable first, then maybe this makes sense.

Pics were during conversion from 12 to 18, and I don't recommend
shoehorning SigmaPro18-A2 into K15 either. Barely fit with lots of
grinding, and kick in the chest retained very little Karlson impact.
DeltaPro12 was a better match to this cabinet. I've not yet tried 15.
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Last edited by kenpeter; 22nd June 2013 at 11:31 AM.
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Old 22nd June 2013, 12:40 PM   #138
freddi is offline freddi  United States
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speaking of 12s, a 12pe32 is nice for a K12 - I don't know if that combo would be considered to kick in the chest but its pretty lively

its interesting to hear the tradeoffs between the little K and an Advent

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Old 22nd June 2013, 12:46 PM   #139
freddi is offline freddi  United States
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one combo which I think is interesting is Eminence's current Beta10cx and a K12 - its somewhat less sensitive than the big motor 12cx/woofers so may give the impression of going a bit lower and there's a sense of power. Beta 10cx is relatively inexpensive at full price. I paid ~$40 each at a sale. Inexpensive compression drivers such as the PRV 280ti work well.
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Old 22nd June 2013, 01:48 PM   #140
xrk971 is online now xrk971  United States
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Freddi,
When you use a bass driver with a compression driver and K-tube, what are your typical cross-overs and how do you implement them? Give me example with above scenario for Beta10cx and PRV CD driver. They do indeed sound like a cost effective PA style system.
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