Karlson front chamber shape?

[freddi]

Look at the 6 inch K-coupler plans and shape of chamber above the slanted baffle. What differences would you expect in response and subjective behavior between the two? (fwiw - I do have curved reflector in a small 8K and 18K but its height is short in the 8K compared to the plan below)

 

[weltersys]

Freddi,

I'd expect the semi-parabolic reflector in the upper cabinet to increase resonant behavior in the mid-range of the 6" from around 400 to 800 Hz. Subjectively, more "sonorous" or "ringing", "full bodied" or "fruity". One might even describe it as having a more eldritch quality, but that may be pushing it a bit ;^).

The extra panel(s) in the lower example would make it behave more like a TL than a BR.
In either case, Fb would be difficult to predict other than empirically.

Art

 

[freddi]

Hi Art - that pretty well describes what might happen with the curved reflector. GregB's "Karlsonator"'s front chamber "reflector" is pretty much just Karlson's K12 extended in height.

btw - your Dad's "K8" is one of the smoothest little K I've seen (purple trace)

 

[picowallspeaker]

Freddi,

I'd expect the semi-parabolic reflector in the upper cabinet to increase resonant behavior in the mid-range of the 6" from around 400 to 800 Hz. Subjectively, more "sonorous" or "ringing", "full bodied" or "fruity". One might even describe it as having a more eldritch quality, but that may be pushing it a bit ;^).

I'd use the right words such as cavity effect for the semi-enclosed volume, and diffraction at borders for the aperture.

 

[freddi]

maybe "lips" is the key word ?

speakers must need lips

 

[freddi]

regarding the rear chamber - is there an advantage to the way Transylvania, KK-Audio, Westwood, Acoustic Control , etc. did a tapered profile ?

the reason I heard that Ks disappeared was due to JBL having patent rights and they threatened to sue at least one maker. (Mrs K apparently issued multiple licenses)

 

[freddi]

hey Weltersys -

my "K18" is like so - about 41.5" H x21.5"W x 16"D

what might improve the next build ?

An externally hosted image should be here but it was not working when we last tested it.