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DBR10 180° 135° 90° PHASE 45° 0° -45° -90° -135° -180° 20 180° 50 100 500 1k FREQUENCY (Hz) 5k 10k 20k 100 500 1k FREQUENCY (Hz) 5k 10k 20k 100 500 1k FREQUENCY (Hz) 5k 10k 20k DBR12 135° 90° PHASE 45° 0° -45° -90° -135° -180° 20 180° 50 DBR15 135° 90° PHASE 45° 0° -45° -90° -135° -180° 20 50