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Curves of
The Decca London Ribbon Tweeter

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Frequency Characteristic & Polar Diagram

The frequency characteristic shows that 3000 or even 4000 Hz. are good x-over frequencies. The measurement was done with the microphone at 1 meter on axis (in the heart of the housing) and 20 kHz. as upper measurement limit. Although the frequency band extends to 40.000 Hz. at about -3dB, the overall characteristic extends to 80.000 Hz. at - 10 dB. That graph will be added later. (Measurements from the documentation of the late Jan Th. Endenburg, engineer, the creator of the Engasound 3 KF.)

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The polar diagram shows the measurement of 2.000, 5.000, 10.000, 15.000 and 20.000 Hz. The dispersion at 2 kHz. and 5 kHz. is more than 60 degrees and is excellent. At 10kHz. and 15 kHz. it is about 40 degrees. Only at 20 kHz. the dispersion is narrowed down to 30 degrees. The microphone was positioned at 1 meter in front of the Ribbon Tweeter, on axis. (Measurements from the documentation of the late Jan Th. Endenburg, engineer, the creator of the Engasound 3 KF.)

 

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