I needed to record some practice tracks for a student today, and decided to adapt upright piano miking technique I saw in SoundOnSound. My studio is very bright, so doing any miking with the lid open or front panel removed is a no-go.
CM3 subcards 60 cm wide, 80 cm from the frame, 80 cm high. The second picture is a bit misleading; the mics were aimed at the top half of the soundboard.
The recording was well-balanced and natural. This will now be my go-to setup.
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For anyone wanting to try this, please understand that this worked great for this instrument in this room, these mics, etc. Your mileage may vary.
@voltronic
(...this piano, this weather, this phase of the moon...)