As a service to the pro-audio DIY and microphone modder communities, we have created the best low-price microphone capsules on the market.
The RK7 Capsule
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The RK7 is our second capsule based on the Neumann K47. With a 32mm outside diameter, it is geometrically a bit closer to the Neumann/Gefell M7 capsule.
Like our original RK-47, the RK7 is a single-blackplate, dual-diaphragm capsule. It is a great match for higher-voltage circuits (75-80V), for microphones that will not easily accommodate a 34mm capsule, and for purists who want 6-micron membranes. Like the RK-47, the RK7 will transform that disused imported condenser into a tool you actually reach for… every session.
Read more about the RK7 capsule.
The RK-47 Capsule
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Our version of the Neumann K47 capsule, mated to a high-quality amplifier circuit, is all but indistinguishable from a Fet 47. Hear the “Fet 47 Voice Test” on our Audio Samples page.
The RK-47 is a center-terminated, single-blackplate, dual-diaphragm capsule that will revoice your screechy imported condenser microphone, making it actually useful for recording acoustic instruments and voices.
Read more about the RK-47 capsule.
The RK-12 Capsule
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Our version of the AKG CK12 capsule reproduces the sonic profile of the original at a significantly lower price point. This is the perfect capsule for a C12-style tube mic mod (Apex 460, anyone?) and for any vocal microphone that would benefit from a big, vintage sound.
The RK-12 is an edge-terminated, dual-backplate, dual-diaphragm capsule, available now.
Read more about the RK-12 capsule.
The RK-67 Capsule
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By popular request, we have developed a high-grade, yet affordable version of Neumann’s classic K67 dual-backplate capsule. This capsule design is the most popular in the world.
The RK-67 is a true 34mm, center-terminated, dual-backplate, dual-diaphragm capsule, available now in a limited first release.
Read more about the RK-67 capsule.
The RK-87 Capsule
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The RK-87 is our second capsule based on the Neumann K67. It differs from our RK-67 in two respects: it has 3-micron diaphragms for faster transient response, and it uses electrically isolated backplates to enable multipattern operation in a ~40V circuit like the original U87(i).
The RK-87 is undergoing a small beta test. We expect initial availability in early May, 2012, and general availability in June.
Read more about the RK-87 capsule.
Choose your color
Although the sound of your microphone will depend in large part on the headbasket design and amplifier topology (tube vs. fet, transformer vs. other), the raw capsules provide two distinct frequency responses to build from:
Note that neither of these capsules exhibits the sharp boost at 8kHz that is characteristic of the knockoff capsules that most imported microphones utilize. Both the RK-47 and RK-12 have a presence boost above 1kHz, but it is broader and smoother than the sharp peaks found in most inexpensive imports — and therefore much more suitable for use in a flat-response circuit such as is commonly found in these same imported microphones.
Audio Samples
Numerous RK-47 audio clips can be found here. Clips featuring the RK-12 are in the works.
Installation Photo Gallery
View photos of RK47 installations and RK12 installations. (We welcome your submissions!)