Placement 4021 (3521 Stereo Kit), magnets on frame

4021 Compact Cardioids in GM4000 Gooseneck Mount and MB4000 Magnet Base

Spacing between microphones approx. 45 cm (1.5 ft)

Height above strings approx. 15 cm (6 in) 

This setup is used in tracks 6, 14, 22, 30, 38, 46, 54