| 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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