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25mm spherical acoustic baffle or "Acoustic Pressure Equalizer" for use with omnidirectional microphones. This attachment subtly changes the frequency response of on-axis signals. Many engineers like the way this attachment boosts high frequency presence in choral and orchestral recordings. The 25mm sphere should have a more subtle effect than the 32 or 40mm sphere.
This model is compatable with 12.8 mm (.5") diameter microphones.