We have a new flavor. Until now, I’ve been using only K47-style capsules in my mics and upgrades. The k47 is has an intrinsically flat full frequency response that works well in a Schoeps style “linear” circuit like the jaSb board. At first glance, the difference between the k47 and a ck12-style capsule is that the k47 is center-terminated. That is, the wire connecting to the gold diaphragm is screwed right into the center of it. The CK12 is edge-terminated meaning the diaphragm is free to vibrate with no constraint in the center.
The CK12 style capsule promises a more open AKG-ish flavor. Because of it’s physical design, it is also a much brighter capsule and needs some compensation in the circuit to flatten it out. After a lot of back and forth between circuit simulators and real-world listening, I’m happy with the way I’ve adapted my jaSb circuit for these capsules. The mics are slightly brighter than say a 414, but not over the top or harsh at all. They do have a very hi-fi extended “silky” top end. I’m really psyched about the two distinct flavors of my mics now.
I think of the differences like this: The K47 capsules have a concentration of energy in the upper mids giving a great presence for vocals, and acoustic instruments. But they also have a very full fat bottom end which makes them great for electric guitars, drums and even bass amps. With the CK12, it’s as if you took a rolling pin and spread out that upper mid energy to extend it up into higher frequencies. It’s less aggressive sounding and has more silky highs.
Built into a similar 44mm Body as the RS/47, the RS/12 has that same small footprint to fit into tight spaces. The optional internal pattern switch is also available as it is using a slight variation on the jaSb circuit board. A Red Matte paint job on the tube and new headbasket design give it a unique look from the RS/47.