(this is also in the multiway forum as a 2-way so moderators may wish to pull one of the posts)
built around 1960-63 by Art Welter's dad and based on the second K12 from ~1956 which was featured as a construction project in the July 1958 issue of Popular Mechanics. A 2/3 scale K12 would be around 1 cubic foot bulk while this one is about 1.65 cubic foot.
I've run it with a Visaton BG20 and that was nice. Its tuned high - like 90Hz so ideally could use a subwoofer/woofer to blend at ~100Hz.
With Beta8CX and the helfty B52/Celestion polyamide diaphragm compression driver, piano is very nice and dynamic - same for drums - it would not disappoint the front horn lovers as a 2-way.. (Xover 1.2mH/10uF LP, 4uF/0.35mH/12uF HP with an L-pad.
sorry for the rough drawing - look at the dims and rear view and
you might make a better one
The front face of the baffle is ~9.4" high x 11" wide.
Front chamber volume ~7.7 liters
(don't worry about that awful wire - it has 18ga real copper wire and disconnects in its current state)
built around 1960-63 by Art Welter's dad and based on the second K12 from ~1956 which was featured as a construction project in the July 1958 issue of Popular Mechanics. A 2/3 scale K12 would be around 1 cubic foot bulk while this one is about 1.65 cubic foot.
I've run it with a Visaton BG20 and that was nice. Its tuned high - like 90Hz so ideally could use a subwoofer/woofer to blend at ~100Hz.
With Beta8CX and the helfty B52/Celestion polyamide diaphragm compression driver, piano is very nice and dynamic - same for drums - it would not disappoint the front horn lovers as a 2-way.. (Xover 1.2mH/10uF LP, 4uF/0.35mH/12uF HP with an L-pad.
sorry for the rough drawing - look at the dims and rear view and
you might make a better one
The front face of the baffle is ~9.4" high x 11" wide.
Front chamber volume ~7.7 liters
(don't worry about that awful wire - it has 18ga real copper wire and disconnects in its current state)
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A dual slot K-tube on top with DE250 is louder than 8CX with the B52/Celestion driver so will have to go inside and mess with the adjustable L-pad.
On some well recorded songs with piano, guitar and upright bass, its pretty good - I think it sounds more dynamic than my FH1 horn system which was 6 times the size.
On some well recorded songs with piano, guitar and upright bass, its pretty good - I think it sounds more dynamic than my FH1 horn system which was 6 times the size.
