Avantone CK6 Mods
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The Avantone CK-6 is a solid little condenser mic, with a nice finish and accessories. The circuit is a standard Chinese implementation of the Schoeps design. (The company's claims that certain capacitors are upgraded appears to not be true, at least in the sample mic we inspected; we see generic box film polyester caps -- the same caps we've been upgrading and replacing on inexpensive mics for years.)
The core problem with this mic is its capsule, or rather, the mismatch between capsule and circuit.
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If you find your CK-6 to be too bright or sibilant for the sources you usually record, we recommend changing the stock capsule for our RK-47.
An alternative option is our RK-12 edge-terminated design, which will give your mic a C414 vibe. The RK-12 is subjectively brighter than the RK-47, but not as peaky/harsh as the stock capsule.