here's one of Carl & Wayne's klams from some years ago - I think it may have used a Polk 675 coax with a k-tube on the dome tweeter
An externally hosted image should be here but it was not working when we last tested it.
^^^^
Somewhat more Rocket than Klam? They are close cousins anyway. Pretty box in any case. 🙂
IG
Somewhat more Rocket than Klam? They are close cousins anyway. Pretty box in any case. 🙂
IG
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the KR5 Rocket in a way was the first klam - Karlson in 1961 had a letter to Poppe talking about an early 8 inch klam - - I'm guessing in operation the metronome shaped rocket above was rotated and mounted with a bracket to the ceiling rather than firing straight up. IIRC the cutting angles are typically six and twelve degrees for the Rocket style.
Here's the frequency response for my mini Klam. I get a strong peak around 600 Hz which I assume is the resonance of the front chamber. I may change the size of the front chamber to see if I can shift the peak to someplace where its less obnoxious.
Karlson's original klams seemed to use ~25 degree angle - I don't know if that would help in a really small unit
Right now I'm using a 40 degree angle. I may try the longer front chamber. That may shift the resonance down lower and get it out of the most critical part of the vocal range.
cardboard might work for prototyping. If results seem usable then a wood or perhaps a diagonally sliced pvc pipe with wood wings would make a finished speaker. It might take a homemade miter box to to get a clean slice with pvc pipe. I'd like to hear the Phase 3 klam made out of 3/4" plywood rather than the original flexy particleboard.
What I may do is extend the front of my current test box out with cardboard to see what happens. I like the pvc pipe idea. My power miter saw slices pvc quite nicely 😉
one thing Carl mentioned was making little driver K tall out of pvc or cardboard tubing - I think the vertically oriented pipes were around 30" tall, driver angled as with regular Ultra-Fidelity type, a 2/3 height slot. I assume there was some sort of back chamber but maybe not - ?
Karlson interview
Hi. I was googling for more info on the theory of Karlson speakers and found this: John Karlson of Karlson loudspeaker fame speaks - 1964 radio - YouTube No idea if its come oup before but thought Id share in case it hasnt 🙂
Regards /Bo
Hi. I was googling for more info on the theory of Karlson speakers and found this: John Karlson of Karlson loudspeaker fame speaks - 1964 radio - YouTube No idea if its come oup before but thought Id share in case it hasnt 🙂
Regards /Bo
This is freddi's post on YT, originally from Roger Russel's archive I believe. Thanks for putting it up as it may catch a few new viewers from here, it's great to hear these audio old-timers. 🙂
IG
I put the whole show up on archive.org - Eric Towline is alive and still working in audio and movies http://archive.org/details/HiFI64PROJECTTRY4
Tomorrow I will be making new test boxes for my mini Klams with a longer front chamber and a different venting scheme. I finally found a good use for all the scrap plywood in my shop 😉
Vented Klam for 3 inch drivers. 17 1/2 inches long 7 inches wide and 7 1/2 inches long with 6 inch by 1 inch port running the length of the cabinet
An externally hosted image should be here but it was not working when we last tested it.
It actually sounds pretty good and I think it will sound great after some tweaking. I'm noticing much less cone movement than a bass reflex cabinet of the same tuning.
What is the design principle? Is the back cavity and vent a transmission line or more like a reflex vent?