3511A is a complete stereo kit with
two 4011A cardioid microphones, carefully matched within 1 dB on frequency
response, sensitivity and self-noise.
These cardioids are exceptionally linear in their frequency response - also off
axis.
Several standard set-ups such as ORTF and XY are possible. The 4011As handle
very high SPL and will therefore allow close-miking as well as more distant
placement.
They are often used for piano recordings of jazz or pop or as overheads for
drums.
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