Karlson's K10 with Beta8cx/APT50 and some parametric EQ plays a drumkit's toms pretty well. (I don't think 12LTA could do that - too feeble of motor)
I've got a chunky 10cx coming and its magnet clearance may require a more slhall0w tilt-back.
To anyone playing electronic drumkits, I'd seriously suggest looking into Karlson type, and probably K-tube if suitable coax aren't available.
Beta10cx's rubber magnet protector makes its slug look larger than reality.
The new-old little 10cx has a decent looking motor but sensitivity could be lower than I like as may have 4.6 mm overhang (???? - its a pig in a poke)
A rear chamber for a K10 is probably less than 1 cubic foot. Front chanmber shape, aspect, venting details are some of the variables.
A high tuned "Karlsonator" might be interesting. A smoothing stub can be added to the front chamber of K-type, but probably I'd just want to retain some "hit".
Oldfi designed an XKi for my Tymphany10 - if I could get someone to cut onc for a reasonable price then that might work with the clunky 10cx and other 10cx.
I do like the idea or a squat box as my "Tiny Ten" sketch as have not tried one.
I've got a chunky 10cx coming and its magnet clearance may require a more slhall0w tilt-back.
To anyone playing electronic drumkits, I'd seriously suggest looking into Karlson type, and probably K-tube if suitable coax aren't available.
Beta10cx's rubber magnet protector makes its slug look larger than reality.
The new-old little 10cx has a decent looking motor but sensitivity could be lower than I like as may have 4.6 mm overhang (???? - its a pig in a poke)
A rear chamber for a K10 is probably less than 1 cubic foot. Front chanmber shape, aspect, venting details are some of the variables.
A high tuned "Karlsonator" might be interesting. A smoothing stub can be added to the front chamber of K-type, but probably I'd just want to retain some "hit".
Oldfi designed an XKi for my Tymphany10 - if I could get someone to cut onc for a reasonable price then that might work with the clunky 10cx and other 10cx.
I do like the idea or a squat box as my "Tiny Ten" sketch as have not tried one.
fwiw I think there's more front volume in the "Tiny Ten" than Bruce's XKi - but the latter might play smoother (?)
from Karlson's first "Acoustic Transducers" patent application, Dec. 4, 1951
A less obvious result of the inclined plane so created in the path of the enclosed sound waves is in its influence of the radiation pattern of said coupling chamber. Properly designed relative to the rate of taper in the aperture, a uniform distribution of energy can be realized over the entire length of said aperture, especially for the high frequencies. When this occurs a roughly semi-cylindrical wave front results. This constitutes an ideal manner of propagation of these sound waves since the high frequencies will not be sharply beamed in any one direction.
If the angle that said inclined plane makes with the plane of said tapered aperture is greatly increased, several effects may be observed. Among these are (1) lower frequency limit (2) increased reverberation time (3) poorer transient response and (4) less uniformity in the radiation pattern throughout the frequency range. Obviously, optimum results for any particular application would be subject to some trial and error tests.
My smaller "K18" was made like the 2nd K12 and with a baffle lay back of about 23 degrees from vertical. It had a pretty smooth response.
from Karlson's first "Acoustic Transducers" patent application, Dec. 4, 1951
A less obvious result of the inclined plane so created in the path of the enclosed sound waves is in its influence of the radiation pattern of said coupling chamber. Properly designed relative to the rate of taper in the aperture, a uniform distribution of energy can be realized over the entire length of said aperture, especially for the high frequencies. When this occurs a roughly semi-cylindrical wave front results. This constitutes an ideal manner of propagation of these sound waves since the high frequencies will not be sharply beamed in any one direction.
If the angle that said inclined plane makes with the plane of said tapered aperture is greatly increased, several effects may be observed. Among these are (1) lower frequency limit (2) increased reverberation time (3) poorer transient response and (4) less uniformity in the radiation pattern throughout the frequency range. Obviously, optimum results for any particular application would be subject to some trial and error tests.
My smaller "K18" was made like the 2nd K12 and with a baffle lay back of about 23 degrees from vertical. It had a pretty smooth response.
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