Klaus Heyne modified Neumann U87

The capsule in this mic is original.  All modifications were electronic.  Klaus claimed that his modification significantly increased the output level.  This appears to be true, since this mic is 13 dB hotter than the Stephen Paul modified U87, and 10 dB hotter than the ADK A-51s(LE).  These measurements were taken with the mic in the cardioid position.

The top white curve is the on axis response, the violet curve is the 90 degree response, and the yellow curve is the 180 degree response.  All mics are measured with the same reference (an Earthworks M30), so you can compare level and frequency response.  Data below 400 Hz is not accurate.

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Edited 11/2/2000